(PHP 4, PHP 5, PHP 7, PHP 8)
ob_end_clean — Clean (erase) the contents of the active output buffer and turn it off
ob_end_clean(): bool
This function calls the output handler (with the PHP_OUTPUT_HANDLER_CLEAN and PHP_OUTPUT_HANDLER_FINAL flags), discards it's return value, discards the contents of the active output buffer and turns off the active output buffer.
ob_end_clean() will fail without an active output buffer started with the PHP_OUTPUT_HANDLER_REMOVABLE flag.
ob_end_clean() will discard the contents of the active output buffer even if it was started without the PHP_OUTPUT_HANDLER_CLEANABLE flag.
This function has no parameters.
If the function fails it generates an E_NOTICE.
The following example shows an easy way to get rid of the contents of the active output buffer:
Example #1 ob_end_clean() example
<?php ob_start(); echo 'Text that won\'t get displayed.'; ob_end_clean(); ?>
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https://www.php.net/manual/en/function.ob-end-clean.php