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Runtime Configuration

The behaviour of these functions is affected by settings in php.ini.

Misc. Configuration Options
Name Default Changeable Changelog
ignore_user_abort "0" PHP_INI_ALL  
highlight.string "#DD0000" PHP_INI_ALL  
highlight.comment "#FF8000" PHP_INI_ALL  
highlight.keyword "#007700" PHP_INI_ALL  
highlight.bg "#FFFFFF" PHP_INI_ALL Removed in PHP 5.4.0.
highlight.default "#0000BB" PHP_INI_ALL  
highlight.html "#000000" PHP_INI_ALL  
browscap NULL PHP_INI_SYSTEM  
For further details and definitions of the PHP_INI_* modes, see the Where a configuration setting may be set.

Here's a short explanation of the configuration directives.

ignore_user_abort boolean

FALSE by default. If changed to TRUE scripts will not be terminated after a client has aborted their connection.

See also ignore_user_abort().

highlight.bg string
highlight.comment string
highlight.default string
highlight.html string
highlight.keyword string
highlight.string string

Colors for Syntax Highlighting mode. Anything that's acceptable in <font color="??????"> would work.

browscap string

Name (e.g.: browscap.ini) and location of browser capabilities file. See also get_browser().

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User Contributed Notes 3 notes

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1
Nico
2 years ago
To pass more than one css rule, but also a class, an id, or any html attribute to highlighted element, we can escape a quote to close the inline styling:

    ini_set('highlight.string', '#F8F8F8 ; font-size:1.4em\" class=\'string\' ');
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0
Eric
7 days ago
*** Additions to the previous message ***

To change the style directly from a CSS file, it is recommended to only go through classes instead of hard-coding it.

<?php

   
// Create an array with default php functions

   
$functions = array("default", "html", "keyword", "string", "comment");

   
// Replace color code (ex: #FF8000) with class name (ex:"highlight-comment")

   
foreach ($functions as $value) {
       
ini_set("highlight.$value", "highlight-$value;");
    }

   
$content = highlight_file($filename, true);
   
// or
   
$content = highlight_string($string, true);

   
// Convert style="color: highlight-function" into class="highlight-function" into $content
    // It allows you to modify only the default functions

   
foreach ($functions as $value) {
       
$content = preg_replace("/style=\"color: highlight-$value;\"/", "class=\"highlight-$value\"", $content);
    }

?>

And in the CSS file (for example) :

.highlight-html { color: #000000; }
.highlight-default { color: #0000bb; }
.highlight-keyword { color: #007700; font-weight: bold; }
.highlight-string { color: #dd0000; }
.highlight-comment { color: #ff8000; }
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0
Eric
7 days ago
To change the style directly from a CSS file, it is recommended to only go through classes instead of hard-coding it.

<?php

    $functions
= array("default", "html", "keyword", "string", "comment");

    foreach (
$functions as $value) {
       
ini_set("highlight.$value", "highlight-$value;");
    }

?>

And in the CSS file (for example) :

.highlight-html { color: #000000; }
.highlight-default { color: #0000bb; }
.highlight-keyword { color: #007700; font-weight: bold; }
.highlight-string { color: #dd0000; }
.highlight-comment { color: #ff8000; }
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