As soon as you call this function all output will be stored in an internal buffer and nothing will be sent to the browser until the script. Otherwise ob_get_flush () will not work. La función ob_get_clean() es una función PHP incorporada que se utiliza para limpiar o eliminar el búfer de salida actual. If I remove the ob_end_clean(); the output is hi hi. add_filter('wp_nav_menu_items', 'crunchify_add_login_logout_menu', 10, 2);2. You must register a filter and let parse your content. Description ¶. This function will send the contents of the output buffer (if any). " Actually, the callback function, once set by ob_start (), will be called regardless. answered Mar 10, 2022 at 19:41. The browser should then only get gz-encoded data as it was the output buffer at the topmost level. log (ab_id_transakce); return empty variable because there is in php ob_get_clean (). It's useful in cases where you may need to filter some output, or you're using a PHP method (such as var_dump) that writes output. We hope this article has been informative and useful in understanding the ob_start () function in PHP. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_end_clean () as the buffer contents are discarded when ob_end_clean () is called. To do this correctly you should be doing ob_start() after ob_get_clean() because ob_get_clean() gets the current buffer contents and delete the current output buffer. I'm using dompdf to try and convert html into a pdf file. We hope this article has been informative and useful in understanding the ob_clean () function in PHP. I actually wrote the function with with ob_get_clean(), however I switched it to ob_get_flush() as the later worked more reliably, i. 22. While this is convenient in some situations for generating documents on-the-fly it also exposes a. Learn more about CollectivesWhen using PHP as the back-end for SSE (Server Sent Events) and similar server streaming solutions, I have been using the @ob_flush();@flush() idiom to make sure the data gets spat out immediately. We then investigated ob_start to capture the output buffer. The function will be called when the output buffer is flushed (sent) or cleaned (with ob_flush (), ob_clean () or similar function) or when the output buffer is flushed to. If you want to use it for a larger buffer you have to edit your php. console. There's a limit to how much there can be buffered which by default is 4KB so you are hitting the maximum with your script. Share. I want to write 1 include shortcode. On development machine sometimes it works but on the test machine it did not work. . 2k 11 11 gold badges 115 115 silver badges 109 109 bronze badges. 4. patch This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. The ob_get_level () function indicates how many output buffers are currently on the stack. In PHP 8. Code Examples. ob_start () use. Descripción ¶. I do not want to write different include functions for each include file. clean) can occur simultaneously. Add a comment | 0 The Problem is, you are replcing tho variables from one source. The ob_start () function is a useful tool for buffering your output in your PHP web application. También se usa para obtener el búfer de salida nuevamente después de limpiar el búfer. There's a limit to how much there can be buffered which by default is 4KB so you are hitting the maximum with your script. corvidmemory. 3. Two problems. ob_get_clean (): string|false. 4. By understanding the syntax and usage of the function, you can easily start output buffering and modify your output before sending it to the client. Which means that the contents returned are not the result returned by the callback, but the input passed to the callback. ob_end_flush () Deletes the topmost output buffer and outputs its contents. Oct 30, 2010 at 20:39. This function discards the contents of the topmost output buffer and turns off this output buffering. However, it is possible that you have output buffering enabled for all files through the output_buffering ini parameter (see the manual ). Collectives™ on Stack Overflow. Lo tienes al revés. If multiple output callback functions are active, output is being filtered sequentially through each of them in nesting order. So this leads me to think that the notices are. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. The ob_clean () function deletes all of the contents of the topmost output buffer, preventing them from getting sent to the browser. g. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this siteSorry flushblocks(); got left in there by accident, that shouldn't be in the example. What you can do is to do an explicit ob_start() again in the beginning of the script so you get a second buffer as they can be nested. php. Sometimes, ob_get_level () may be off by 1 because at the start of the script, it will return 1 even if ob_start () has never been called (and clearing the output buffer via ob_end_clean () and the like can be done without error). Why is ob_get_contents not working. Here's my function:The ob_get_contents () function has different return behaivor in PHP 5. ob_end_flush (): bool. ob_flush. ob_get_clean — Get current buffer contents and delete current output buffer. My issue now is that the PHP scripts I'm trying to capture output from need variables passed to them using HTTP Get. While output buffering is active no output is sent from the script (other than headers), instead the output is stored in an internal buffer. ini settings to reflect that. . The accepted answer's suggestion is to use ob_start (); to start getting output then use ob_get_clean (); to put the output into a variable. I think in this case they mean the same thing. Usually, if you just need to format a string with HTML, just use. ob_end_clean() don't work as intended. For example: use function OutputControlob_start; use function OutputControlob_end_flush; use function OutputControlob_get_clean; ob_start ();. Just call flush whenever you want to force the content to the browser. Keep in mind that output may be buffered by default, depending on how you are running PHP (CGI, CLI, etc. This function discards the contents of the output buffer. 0, but it seems that the function is deprecated in 4. 出力バッファを「フラッシュ（出力）」してから、出力のバッファリングをオフにする。. g. Learn more about TeamsIt is that the ob_start, ob_get_clean don't work synchronously in the view process causes the problem. ob_clean (): bool. php file and you should start seeing Login / Login on your main header. Find centralized, trusted content and collaborate around the technologies you use most. Learn more about CollectivesI have an issue with a shortcode that I'm writing for wordpress. ob_get_contents() fetches whatever is inside the buffer. It shows in the top all the time but I have read some about ob_start(); and trying to use it but the shortcode just returns nothing. We hope this article has been informative and useful in understanding the ob_start () function in PHP. In PHP 8. 1) ob_flush (), flush () in any combination with other output buffering functions; 2) changes to php. Apart from the fact that this code is a total mess and that its syntax is incorrect because of the lack of semicolon at the end of ob_flush() call, the main problem is that the filenames you read from the templist. ob_get_clean() は、基本的に ob_get_contents() および ob_end_clean() を同時に実行するのと同じです。 出力バッファを開始するときに、 ob_start() で PHP_OUTPUT_HANDLER_CLEANABLE フラグを指定する必要があります。指定しなければ、 ob_get_clean() は動作しません。 With output buffering, your HTML is stored in a variable and sent to the browser as one piece at the end of your script. If you want to use it for a larger buffer you have to edit your php. Books. Capture php output of function call. 13 of php on MAMP and saw the same problem. The output buffering functions are also useful in hackery to coerce functions that only print to return strings, ie. Table of Contents flush — 출력 버퍼를 비웁니다 ob_clean — 출력 버퍼를 지웁니다 ob_end_clean — 출력 버퍼를 지우고 출력 버퍼링을 종료 ob_end_flush — 출력 버퍼를 전송하고 출력 버퍼링을 종료 ob_flush — 출력 버퍼를 전송합니다 ob_get_clean — 현재 버퍼. Note, this section of your code:Capture HTML output. ob_get_contents(); ?> flush 함수는 출력물을 브라우저로 보내고, 출력 버퍼를 비우는 역할을 하지만, 서버나 클라이언트에 영향을 주지 않습니다. But let's suppose you can, is the first thing that happens in this class always an ajax request? If not, then you still haven't initiated ob_start(). ob_get_flush() — This functions creates combinatorial effects of both ob_get_contents() and ob_end_flush(). This way when you won’t go inside that “if”, you are closing the output buffer which wasn’t started by you. Code Examples. ) I started thinking about it after reading. ob_get_contents — Return the contents of the output buffer. There are couple of other ob_ functions for more flexibility. The ob_clean () function deletes all of the contents of the topmost output buffer, preventing them from getting sent to the browser. Taking ob_start() out of my code seems to make no difference to how it works. Conclusion. 0, 5, 7, 8) ob_flush (보내기) 출력 버퍼 이 함수는 출력 버퍼 (있는 경우)의 내용을 보냅니다. ob_get_length() gets the size of the buffer, in bytes. ob_get_clean — Get current buffer contents and delete current output buffer. ob_flush() - Vaciar (enviar) el búfer de salida ob_end_flush() - Volcar (enviar) el búfer de salida y deshabilitar el almacenamiento en el mismo ob_end_clean() - Limpiar (eliminar) el búfer de salida y deshabilitar el almacenamiento en el mismo ＋add a note現在のバッファの中身を取得し、出力バッファを削除します。 ob_get_clean() は、基本的に ob_get_contents() および ob_end_clean() を同時に実行するのと同じです。 出力バッファを開始するときに、 ob_start() で PHP_OUTPUT_HANDLER_CLEANABLE フラグを指定する必要があります。I know that this is an old question but I wanted to write my answer for visual learners. When placing a shortcode on a custom WordPress page the output is always displayed at the top of my page content. 0, default_charset value is used as default. Sometimes, ob_get_level () may be off by 1 because at the start of the script, it will return 1 even if ob_start () has never been called (and clearing the output buffer via ob_end_clean () and the like can be done without error). If you want to further process the buffer's contents you have to call ob_get_contents () before ob_flush () as the buffer contents are discarded after ob_flush () is called. The output buffer must be started by ob_start() with PHP_OUTPUT_HANDLER_CLEANABLE flag. ob_get_clean, only works twice. By understanding the syntax and usage of the function, you can easily start output buffering and modify your output before sending it to the client. Basically you need to ob_start() before first html tag or php code printing the data - if that div stage1sat should belong to message, then you need to move ob_start before it. Q&A for work. Cette fonction vide le tampon de sortie sans l'envoyer au navigateur. 2. Best you can do is:. Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this siteNoted, and I understand that. But before returning the code to the caller, do the necessary text substitution. If you don't buffer your output, it doesn't seem like it would be possible for a web server to output a Content-Length header. 2. ob_get_clean — Get current buffer contents and delete current output buffer. // We use str_pad () to make the output long enough. Share. 0, PHP 5, PHP 7) ob_get_clean — Get current buffer contents and delete current output buffer Description ob_get_clean ( ) : string Gets the current buffer contents and delete current output buffer. Output buffers are stackable, that is, you may call ob_start () while another ob_start () is active. Also, there is another function ob_get_contents() that grabs all of the data gathered since we called ob_start. Fortunately, there’s a single function that “harvests” and deactivates your buffer all at once: ob_get_clean(). PHP may be configured to automatically create an output buffer when the script begins, which is why the buffer level may be 1 without calling ob_start (). I have used ob_start and ob_get_clean function to clear the buffer and it starts working. See the syntax, return value, and examples of this function in PHP. (The ordering is important: ob_flush() flushes PHP's buffers, flush() then tells Apache to flush it too. This function does not destroy the output buffer like ob_end_clean () does. Just make sure that you call ob_end_flush () the appropriate number of times. Trong PHP vốn đã chạy nhanh nay còn có thêm cơ chế cache làm cho ngôn ngữ PHP ngày càng hoàn hảo. Output can come from any of the following sources:. This will help you better understand. 1,658 1 1 gold badge 16 16 silver badges 32 32 bronze badges. - At the end of the ajax page callback, we would ob_get_clean() + watchdog, then headers + print, then ob_start() again, register a shutdown function, and exit(). A callback function can be passed in to do processing on the contents of the buffer before it gets flushed from the buffer. Using ob_gzhandler and manually echo'ing the buffer. (PHP 4 4. El búfer de salida debe estar iniciado por ob_start () con el indicador PHP_OUTPUT_HANDLER_CLEANABLE Si no, ob_get_clean () no funcionará. ob_get_clean — Get current buffer contents and delete current output buffer. Q&A for work. Here I’ve just added style: float=right. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_end_flush () as the buffer contents are discarded after ob_end_flush () is called. I have large amount of data as string which includes text and lots of images. Yes it's exiting before reaching to ob_get_clean. Syntax. 4. I was trying to debug my code using error_log() and I discovered that ob_get_clean() also truncates the error_log() buffer right in the middle of its output, and well as the output buffer which it is supposed to truncate. Take a look at very simple example for PHP 5. oh my god @Paul Norman. By understanding the syntax and usage of the function, you can easily clear the output buffer to start fresh. Follow answered Feb 29, 2016 at 15:54. Learn how to use the ob_get_clean () function in PHP, an in-built function that cleans or deletes the current output buffer and returns the output buffering again. php, instead ob_start() and ob_get_clean() are ignored, and the output of links. See syntax, parameters, return value and examples of this function. ini involving setting output_buffer and/or zlib. This is a bit harsh. – bjauy May 21, 2012 at 7:41So I need to add an atributte to the shortcode in order to specify a custom filed value inside a loop which in turn is inside the get_template_part specified in the shortcode as follows: function testimonios_shortcode() { ob_start(); get_template_part('testimonios'); return ob_get_clean(); } add_shortcode(. 5. ob_flush ( void ) : void. Gets the current buffer contents and delete current output buffer. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. In theory when I call _insert() function in test. A callback function can be passed in to do processing on the contents of the buffer before it gets flushed from the buffer. you have to use the new aliases instead of using the PHP 7. Share. These are the top rated real world PHP examples of ob_GET_clean extracted from open source projects. According to the manual,. // Turn on implicit flushing. Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Learn how to use the ob_get_clean () function in PHP, an in-built function that cleans or deletes the current output buffer and returns the output buffering again. flush () Attempts to send content from the system's output buffer to the browser. And by that you can put the variable content into your json data. flush is different in that it asks the web server to output PHP's current internal buffer to the client (browser), but to wait for further output (i. The ob_flush () function outputs the contents of the topmost output buffer and then clears the buffer of the contents. 2. 3. 2 Answers. Otherwise ob_get_clean() will not work. If your theme is not displaying your shortcodes, probabily you output the content of the post without let Wordpress filter it. However, like I mentioned, if the webserver is. ob_get_flush() Returns the current buffer contents, output it immediately, then clean it out. I am including HTML template in my shortcode by using ob_start & ob_get_clean. Pippin. imagejpeg outputs an image. Share. ob_get_clean() When ob_end_clean() is called, it turns off buffering. Once output has started, the only way to redirect is through JavaScript, you cannot use PHP. I'm trying to find a catch-all filter that gives me one last crack at modifying the final markup in its entirety before output. Remember you need to clean the output buffer (ob_end_clean();) before the end of the file, or the page content could be outputted twice. Php - ob_get_clean, only works twice, ob_get_clean turns off output buffering. Though why are you using ob_ functions, you should only need them for the most part if you're building a templating system, and want to render in variables html etc, but then you add the ob_ calls inside the function. If you are using error_log(), use ob_get_contents() and ob_end_clean() instead of ob_get_clean(). My main template file which would have the page layout (header, body, sidebar, footer) is included into the page. This is fine in contexts where you're outputting stuff directly, but sometimes you want to use that workflow, but capture the output instead of sending it to the browser. Definition and Usage. ), let's assume that we are looping through a set of users (as setup_userdata() fills the global variables of the currently logged in user and isn't useful for this task) and try to display. Hi, i am using 0. . It seems like MAMP is not performing the function 'ob_get_clean()' correctly. Capturing PNG stream with PHP output buffer. I'm making my first plugin and I have a problem with displaying my shortcode. So, it's crucial to consider the trade-offs and optimize when necessary, like using pagination or chunking the output. 3. We can take the previous example to learn how to subsequent buffers into a stack. What I am trying to do to get rid of buffer contents is using ob_end_clean() to empty the buffer completely. Get early access and see previews of new features. 3. ob_get_clean does two things: it gets the contents of the buffer as a string, and it cleans out the buffer. – Cain Nuke Jun 25, 2019 at 23:37Off the top of my head, ob_flush() basically outputs the current buffer to PHP's internal buffer, then cleans the ob buffer. Learn more about CollectivesThe idea is to not use <?php and ?> tags in the code but rather stand-ins START_PHP and END_PHP, which have no meaning to PHP. ob_clean ()：. g. 14. PHP ob_end_clean does not clear buffer. Une des plus pratique est ob_get_contents qui permet de récupérer le contenu du tampon de sortie dans une. The output buffer must be started by ob_start with PHP_OUTPUT_HANDLER_FLUSHABLE flag. Output had to have started in order for processing to get to your shortcode. 1. Syntax. I found this question on Stack Overflow, and it basically does what I want. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_end_clean () as the buffer contents are discarded when ob_end_clean () is called. I almost looked around the internet on how to remove newlines in the strings and that's the common and fastest method to remove the newlines aside from using the slowly preg_replace(). もしダウンロード処理までに出力バッファがあった場合、 ob_end_flush () を使うと、そのバッファの中身が出力されます。. After this you can move go on - even with only flush () instead of ob_flush (). ob_get_clean, only works twice. 3. 6. ob_get_length() Get the size of the buffer, in bytes. Keep in mind output buffering should generally be a last resort - don't get too comfortable with doing this everywhere! By the way, you can avoid all the calls to echo by just ending the PHP block ( ?> and starting it again when you're done ( <?php ). I understand, that only cleanable buffer can't be flush and delete. It executes both ob_get_contents () and ob_end_clean () functions. ini. 3. This attempts to push current output all the way to the browser with a few caveats. ob_get_flush — Flush the output buffer, return it as a string and turn off output buffering. In versions of dompdf prior to 0. First follow what the codex says Shortcodes. 在php的默认配置下，php输出是先输出到缓冲区（output_buffering，内存区域），然后输送到浏览器。. If you want to further process the buffer's contents you have to call ob_get_contents () before ob_flush () as the buffer contents are discarded after ob_flush () is called. However ob_get_clean() retrieves the contents first, and then cleans the buffer. The cool thing about ob_get_clean() is that it executes both ob_get_contents() and ob_end_clean(). Actually, we can use type regulation - intval (ob_get_contents ()), for cheking On/Off output buffering, but it lays the possible problems in the future. When the. I think what @toscho tried to say isn't that you can't nest, but that if for some reason you call ob_get_clean() before the code of e. Conclusion. If you are using error_log(), use ob_get_contents() and ob_end_clean() instead of ob_get_clean(). Be sure your includes do not already send something to the browser. Ver también. If you are using error_log(), use ob_get_contents() and ob_end_clean() instead of ob_get_clean(). 2) $bild="images/newimage2. Code Examples. 1. it uses flush() and ob_flush() functions. I think that function will be prone to further bugs, therefor using ob_start/ob_end_clean is easier to comprehend. Otherwise. Otherwise ob_clean() will. After this is done you are not able to modify header. // Some browsers will not display the content if it is too short. PHP ob_end_clean does not clear buffer. if you don't call ob_start() again with the ob_gzhandler callback function, the output will not be compressed, but the header will say it is. Parameters. it will work as you would use ob_start with no. Show file. Actually, we can use type regulation - intval (ob_get_contents ()), for cheking On/Off output buffering, but it lays the possible problems in the future. But when an exception is thrown inside the buffer reader it will effect the reader by stopping it and echo the output instead of keep capturing it. It's useful in cases where you may need to filter some output, or you're using a PHP method (such as var_dump) that writes output. I manage to update cart quantity with filter woocommerce_add_to_cart_fragments like this:Get LearnDash template and pass data to be used in template includes/class-ld-cpt-instance. function test_shortcodes () { return 'Shortcodes are working!'; } add_shortcode ('test_shortcodes', 'test_shortcodes'); I have. ob_end_clean() don't work as intended. ) of the included file and use the output in a variable (string)?Do you want to return certain values from the included files and use them as a variable in your host script?; Local variables in your included files will always be moved to the current scope of your host script - this. If multiple output callback functions are active, output is being filtered sequentially through each of them in nesting order. También se usa para obtener el búfer de salida nuevamente después de limpiar el búfer. It says that use of flush() and ob_flush() will cause the data to go in memory until it's displayed and as such that its not good for server with limited resources. Teams. 참고 See also header() and setcookie() . x. Answer to your both the question lies in output buffer(ob), Hope this will help you out in understanding. 3. This function does not destroy the output buffer like ob_end_flush. In this circumstance, the view process echoes the content of site first anomalously before the response sends cookie, headers, and content. So the first thing in your script should be ob_start (). So, the functions ob_start(); ob_get_contents(); and ob_end_clean(); don't work. it will work as you would use ob_start with no. ob_get_clean() — Similarly, this will be the combination of ob_get_contents() and ob_end_flush(). As a result, the first ob_start () will have an ob_get_level () of 2, the second will be 3, and so on. Here are the functions you could use: ob_get_clean. IE 'some text' is extracted from the buffer and prepared to be returned as per the requirement of the 'get' functionality. It looks like the answer is no, there is no single command to get the output buffer and erase it without turning it off. , ob_get_clean() would only return the contents of style. ob_end_clean () Deletes the topmost output buffer and all of its contents. htaccess. ob_get_status() - Trả về thông tin của các bộ đệm đầu ra. thanks I appreciate it more than you know. corvidmemory corvidmemory. I'm facing a weird problem when using the Elementor Wordpress Page Builder. ob_end_clean (): bool. How to pass a callback function with parameters for ob_start in PHP? 4. - To make peace with devel, we use drupal_set_header() to set the headers. Use of ob_start() and ob_get_clean() 0. I couldn't find any diagrams explaining output buffering on the worldwide-web so I made a diagram myself in Windows mspaint. Asking for help, clarification, or responding to other answers. The most common is wkhtmltopdf, which is a binary that include Chrome's rendering engine webkit to interpret the page and print the pdf. Neither discarding the buffer's contents (ob_clean() ob_end_clean(), ob_get_clean()) nor retrieving the current buffer contents (ob_get_contents(), ob_get_clean()) invoke the output callback. Hooking on the wp_h. <?php ob_start (); echo 'a'; print 'b'; // some statement that removes all printed/echoed items ob_end_clean (); echo 'c'; // the final output is equal to 'c', not 'abc' ?>. If output buffering is turned off, then echo will send data immediately to the Browser. W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Tôi nhắc đến cơ chế cache vì các hàm ob_start(), ob_get_contents(), ob_clean(), ob_end_flush() sẽ hỗ trợ chúng ta trong quá trình thực hiện cơ chế này. Milo Milo. If you want, use output buffering with ob_start() and ob_get_clean() to get the output contents into a string which you can then use to fill out Content-Length. Return ValuesEverything is enabled, and I believe the problem is that running ob_get_level () at the start of my script produces a level of 1. Output buffering works by intercepting all output; anything in between ob_start() and ob_end_clear() is intercepted; any output that precedes ob_start() is not. ob_get_clean (): string. Those 4 lines of code wouldn't display the contents. Descripción ¶. The ob_get_flush () function outputs the contents of the topmost output buffer, returns the contents and the deletes the buffer. There's a limit to how much there can be buffered which by default is 4KB so you are hitting the maximum with your script. Specifically, would it benefit from patching a different value into the output_buffer_size (not the correct value name) in CodeIgniter (instead of 4K of data by default) -- and would it function if ob_get_length() was a larger value than 0 -- would that last bit of data never get sent (and die in an output_buffer)?Definition and Usage. echo str_pad ("Hello World!", 4096); // Even though the script is still running, the. Using ob_get_clean(), there is even a double notice: "ob_get_clean(): failed to delete buffer of default output handler (1)". As a result, the first ob_start () will have an ob_get_level () of 2, the second will be 3, and so on. Of course, I was overlooking the fact that the only reason to use the callback on ob_start() was because I wanted to run Obfuscate() on the content before it was flushed, but if I'm getting that content back I don't need to run a callback! So, not using a callback and just running ob_get_clean()'s results through Obfuscate() does what I wanted. Follow edited Nov 17 at 20:42. Provide details and share your research! But avoid. Otherwise this function will not work. Follow edited Oct 8, 2014 at 1:22. The output buffer must be started by ob_start () with PHP_OUTPUT_HANDLER_CLEANABLE flag. Your shortcode callback is going to output content rather than return it which is why you're seeing it appear at the top of your page. I assume that is the underlying part of Intervention too, but you can see the issues lies with how to deal with. ob_get_flush — Flush the output buffer, return it as a string and turn off output buffering. So the fix I’m suggesting is this:So the original code was without the action? if thats the case you have a ob_get_clean() after a return, return, well, returns the value (in this case a json string) and stops there, no other code after return is being executed. Definition and Usage. I have known for a long time that it closes the buffer and calls both ob_get_contents and ob_end_clean. ob_get_clean ( ): string|false. x and PHP 5. Share. I understand that you should not want to handle this kind of errors in your own code since it has to be clean & tested but still you might get some, e. The problem with this is, that you have “ob_get_clean” outside the “if”, where “ob_start” is. Since `ob_get_clean()` accumulates the entire output in memory, dealing with large amounts of data might affect performance and memory usage. Some parameters will be different depending on the include. Q&A for work. Here at first, inside of the PHP tags, a. 3. Im novice so i dont understand what this doing. This function will send the contents of the output buffer (if any). php output. I was trying to debug my code using error_log() and I discovered that ob_get_clean() also truncates the error_log() buffer right in the middle of its output, and well as the output buffer which it is supposed to truncate.