What is PHP ob_list_handlers() function?
If you want to know all the handler’s names being used in your current output buffer, use ob_list_handlers() function.
Syntax:
ob_list_handlers()
Parameters:
This function has no parameter.
Return Values:
The function returns an array with handlers list. Each array element contains one handler name.
- It returns “default output handler” If output buffering is enabled in php.ini file.
Examples:
<pre>
<?php
print_r(ob_list_handlers());
ob_end_flush();
ob_start();
print_r(ob_list_handlers());
ob_end_flush();
ob_start("ob_gzhandler");
print_r(ob_list_handlers());
ob_end_flush();
ob_start(function($something) { return$something;});
print_r(ob_list_handlers());
ob_end_flush();
?>
</pre>
Output:
Array
(
[0] => default output handler
)
Array
(
[0] => default output handler
)
Array
(
[0] =>ob_gzhandler
)
Array
(
[0] =>Closure::__invoke
)
Explanation:
The first array element is “default output handler” because the output buffering is enabled in php.ini file. The second array element is “default output handler” because the output_buffering is enabled in php.ini file and no output_handler is set to ob_start() function. The third array element is “ob_gzhandler” because this is a output handler used in ob_start() function. The fourth array element is “Closure::__invoke” because the closure (anonymous function) is used as callable.
PHP Version Support:
PHP 4>= 4.3.0, PHP 5, PHP 7, PHP 8
Summary: PHP ob_list_handlers() Function
The ob_list_handlers() function is a built-in PHP function and part of the PHP’s Output Control functions. Call it when you want to know all the output handlers.