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Function highlight_string() in its pure form is IMHO rather messy.
But it can be easily made tidy and more handy with minor changes and CSS use:
● Line numbers of code (based on HTML <ol> & <li>, so they don't mess selecting code)
● Optional loading code from a file
● Tidy code:
● Replacing style attributes with use of CSS classes
● Removing unnecessary tags
● Countless to spaces (CSS handles that) etc.
<?php
/**
* Code syntax highlighting
*
* @version 2025.06.12
* @author Walerian Walawski
* @link https://w87.eu/
*
* @param string|null $file — path of a file to load or null to use OB
*/
function w87HighlightCode($file = null)
{
static $w87HighlightCodeOn = false;
ini_set('highlight.comment', 'comment');
ini_set('highlight.default', 'default');
ini_set('highlight.html', 'html');
ini_set('highlight.keyword', 'keyword');
ini_set('highlight.string', 'string');
if(!$file && !$w87HighlightCodeOn){
ob_start();
$w87HighlightCodeOn = true;
}else{
$code = highlight_string(trim($file ? file_get_contents($file) : "<?php\n".ob_get_contents()."\n?>"), true);
$code = preg_replace(["|^\\<code\\>\\<span style\\=\"color\\: (.+){2,24}\"\\>|", "|\\</code\\>\$|", "|\\</span\\>\$|"], '', trim($code), 1);
$code = str_replace([' style="color: ', '<br />', ' '], [' class="w87-hc-', '</li><li>', ' '], trim($code));
if(!$file) ob_end_clean();
$w87HighlightCodeOn = false;
return '<ol class="w87-hc-lines"><li>'.$code.'</li></ol>';
}
}
/** -----------------------------------------------------------------------------
* Use the function above with the CSS included in your styles file or in <head>:
* ------------------------------------------------------------------------------
<style>
.w87-hc-lines{background:#06121F;color:#FFFFFF;
font-family:monospace;white-space:pre-wrap;word-wrap:break-word;padding:4px 6px;margin:-2px 0 4px 45px;line-height:18px;}
.w87-hc-lines li{background:#09192B;padding:1px 0 0 5px;font-family:Monospace;}
.w87-hc-lines li:nth-child(odd){background:#112233;}
.w87-hc-comment{color: #FFAA00;}
.w87-hc-default{color: #AAFF00;}
.w87-hc-html{color: #00EEFF;}
.w87-hc-keyword{color: #FF2277; font-weight: bold;}
.w87-hc-string{color: #FFFFFF;}
</style>
*/
?>
Using to highlight code in a file:
<?php
echo w87HighlightCode(__DIR__.'/fileName.php');
?>
Using with output buffering for handy embedding code:
<?php echo '<h3>This is a test code example</h3>';
w87HighlightCode(); ?>
echo "Now 'quetes' and $other \n $special chars. don't require 'escaping'!";
<?php echo w87HighlightCode(); ?>
----
Server IP: 45.112.84.4
Probable Submitter: 80.90.5.137 (proxied: 89.234.212.36)
----
Manual Page -- https://php.net/manual/en/function.highlight-string.php
Edit -- https://main.php.net/note/edit/130364
Del: integrated -- https://main.php.net/note/delete/130364/integrated
Del: useless -- https://main.php.net/note/delete/130364/useless
Del: bad code -- https://main.php.net/note/delete/130364/bad+code
Del: spam -- https://main.php.net/note/delete/130364/spam
Del: non-english -- https://main.php.net/note/delete/130364/non-english
Del: in docs -- https://main.php.net/note/delete/130364/in+docs
Del: other reasons-- https://main.php.net/note/delete/130364
Reject -- https://main.php.net/note/reject/130364
Search -- https://main.php.net/manage/user-notes.php