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2 years ago
Here is the best way to highlight code if you want classes instead of inline styles:

<?php
function highlightcode($text){
    
    ini_set("highlight.comment", "c-comment");
    ini_set("highlight.default", "c-default");
    ini_set("highlight.html", "c-default");
    ini_set("highlight.keyword", "c-keyword");
    ini_set("highlight.string", "c-string");
    
    $text =
        trim(
            str_replace(
                '<br />',
                "\n", // replace <br> with newlines
                str_replace(
                    [
                        // leading <?php garbage
                        "<span style=\"color: c-default\">\n&lt;?php&nbsp;",
                        "<code>",
                        "</code>"
                    ],
                    "",
                    highlight_string("<?php " . $text, true)
                )
            )
        );
    
    // replace colors
    $classes = ["c-comment", "c-default", "c-keyword", "c-string"];
    
    foreach($classes as $class){
        
        $text = str_replace('<span style="color: ' . $class . '">', '<span class="' . $class . '">', $text);
    }
    
    return $text;
}
?>

Generates output that looks like this:

<span class="c-keyword">if(</span>condition<span class="c-keyword">){
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span class="c-string">"HTML&nbsp;here"</span><span class="c-keyword">;
}</span>

Hope this helps.
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