This will return an array with the output handlers in use (if any). If output_buffering is enabled, ob_list_handlers() will return "default output handler".

Example 1. ob_list_handlers() example

 <?php
//using output_buffering=On
print_r(ob_list_handlers());
ob_end_flush();

ob_start("ob_gzhandler");
print_r(ob_list_handlers());
ob_end_flush();
?>

The above example will output:

Array (     [0] => default output handler ) Array (     [0] => ob_gzhandler )

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