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Latest Version [8.00202205221] Last Updated [May-22-2022]


PHP Manual [php_strip_whitespace]

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PHP Manual || Misc. Functions

(PHP 5, PHP 7)

php_strip_whitespaceReturn source with stripped comments and whitespace


php_strip_whitespace ( string $filename ) : string

Returns the PHP source code in filename with PHP comments and whitespace removed. This may be useful for determining the amount of actual code in your scripts compared with the amount of comments. This is similar to using php -w from the commandline.



Path to the PHP file.

Return Values

The stripped source code will be returned on success, or an empty string on failure.


This function respects the value of the short_open_tag ini directive.


This function works as described as of PHP 5.0.1. Before this it would only return an empty string. For more information on this bug and its prior behavior, see bug report » #29606.


Example #1 php_strip_whitespace() example

// PHP comment here

 * Another PHP comment

echo        php_strip_whitespace(__FILE__);
// Newlines are considered whitespace, and are removed too:

The above example will output:

 echo php_strip_whitespace(__FILE__); do_nothing(); ?>

Notice the PHP comments are gone, as are the whitespace and newline after the first echo statement.

PHP Manual || Misc. Functions