PHP: php_strip_whitespace

Примеры

Пример 1. php_strip_whitespace() example

<?php // PHP comment here /* * Another PHP comment */ echo php_strip_whitespace(__FILE__); // Newlines are considered whitespace, and are removed too: do_nothing(); ?>
Результат выполнения данного примера:
<?php 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_strip_whitespace

flconseil at yahoo dot fr
08-Jul-2006 08:57


Beware that this function uses the output buffering mechanism.



If you give a 'stream wrapped' path as argument, anything echoed by the stream wrapper during this call (e.g. trace messages) won't be displayed to the screen but will be inserted in php_strip_whitespace's result.



If you execute this stripped code later, it will display the messages which should have been output during php_strip_whitespace's execution !

mwwaygoo AT hotmail DOT com
27-Apr-2006 09:17


I thought this was a nice function until I realised it wouldnt strip down html. As i'd been reading an article on compressing output to speed up delivery.

So I wrote a little one to do that for me. Here its is, incase people were looking for a html version. It may need tweaking, like with existing &nbsp;'s.



<?php

function strip_html($data)

{

    // strip unecessary comments and characters from a webpages text

    // all line comments, multi-line comments \\r \\n \\t multi-spaces that make a script readable.

    // it also safeguards enquoted values and values within textareas, as these are required



    $data=preg_replace_callback("/>[^<]*<\\/textarea/i", "harden_characters", $data);

    $data=preg_replace_callback("/\\"[^"<>]+\\"/", "harden_characters", $data);



    $data=preg_replace("/(//.*n)/","",$data); // remove single line comments, like this, from // to \\n

    $data=preg_replace("/(t|r|n)/","",$data);  // remove new lines \\n, tabs and \\r

    $data=preg_replace("/(/*.**/)/","",$data);  // remove multi-line comments /* */

    $data=preg_replace("/(<![^>]*>)/","",$data);  // remove multi-line comments <!-- -->

    $data=preg_replace('/(\\s+)/', ' ',$data); // replace multi spaces with singles

    $data=preg_replace('/>\\s</', '><',$data); 



    $data=preg_replace_callback("/"[^\\"<>]+"/", "unharden_characters", $data);

    $data=preg_replace_callback("/>[^<]*<\\/textarea/", "unharden_characters", $data);



    return $data;

}



function harden_characters($array)

{

    $safe=$array[0];

    $safe=preg_replace('/\\n/', "%0A", $safe);

    $safe=preg_replace('/\\t/', "%09", $safe);

    $safe=preg_replace('/\\s/', "&nbsp;", $safe);

    return $safe;

}

function unharden_characters($array)

{

    $safe=$array[0];

    $safe=preg_replace('/%0A/', "\\n", $safe);

    $safe=preg_replace('/%09/', "\\t", $safe);

    $safe=preg_replace('/&nbsp;/', " ", $safe);

    return $safe;

}

?>



The article code was similar to this, which shouldn't work as php_strip_whitespace takes a filename as input:-



<?php

// ob_start(); and output here

$data=ob_get_contents();

ob_end_clean();

if(strstr($_SERVER['HTTP_ACCEPT_ENCODING'],'gzip'))

{

    $data=gzencode(php_strip_whitespace($data),9);

    header('Content-Encoding: gzip');

}

echo $data;

?>

Cosmo
31-Mar-2006 03:27


With newlines stripped your HEREDOCs won't work.

dnc at seznam dot cz
21-Oct-2005 03:01


This function can not be used to strip comments outside <?php ... ?>



// this comment will not be removed

<?php

// this comment will be removed

?>

amedee at amedee dot be
09-Jul-2005 05:29


Not only can this be used for JavaScript files, but also for:



* Java source code

* CSS (Style Sheets)

* Any file with C-style comments.

php_strip_whitespace

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