Clean (erase) the contents of the active output buffer

# ob_clean

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

ob_clean — Clean (erase) the contents of the active output buffer

### Description

ob_clean(): bool

This function calls the output handler (with the `PHP_OUTPUT_HANDLER_CLEAN` flag), discards it's return value and cleans (erases) the contents of the active output buffer.

This function does not turn off the active output buffer like ob_end_clean() or ob_get_clean() does.

ob_clean() will fail without an active output buffer started with the `PHP_OUTPUT_HANDLER_CLEANABLE` flag.

### Parameters

This function has no parameters.

### Return Values

Returns `true` on success or `false` on failure.

### Errors/Exceptions

If the function fails it generates an `E_NOTICE`.

### See Also

- ob_start() - Turn on output buffering
- ob_get_contents() - Return the contents of the output buffer
- ob_end_clean() - Clean (erase) the contents of the active output buffer and turn it off
- ob_get_clean() - Get the contents of the active output buffer and turn it off
- ob_flush() - Flush (send) the return value of the active output handler

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