How to Extract Class Names Containing \"postclass\" from a CSS File with PHP?

Utilize PHP to Parse CSS Files

Question: How can I effectively parse a CSS file using PHP, specifically extracting class names containing "postclass"?

In CSS:

#stuff {
    background-color: red;
}

#content.postclass-subcontent {
    background-color: red;
}

#content2.postclass-subcontent2 {
    background-color: red;
}

The desired PHP output:

arrayentry1:
#content.postclass-subcontent
arrayentry2:
#content2.postclass-subcontent2

Answer:

<code class="php">function parse($file){
    $css = file_get_contents($file);
    preg_match_all( '/(?ims)([a-z0-9\s\.\:#_\-@,]+)\{([^\}]*)\}/', $css, $arr);
    $result = array();
    foreach ($arr[0] as $i => $x){
        $selector = trim($arr[1][$i]);
        $rules = explode(';', trim($arr[2][$i]));
        $rules_arr = array();
        foreach ($rules as $strRule){
            if (!empty($strRule)){
                $rule = explode(&quot;:&quot;, $strRule);
                $rules_arr[trim($rule[0])] = trim($rule[1]);
            }
        }
        
        $selectors = explode(',', trim($selector));
        foreach ($selectors as $strSel){
            $result[$strSel] = $rules_arr;
        }
    }
    return $result;
}</code>

You can then use it as follows:

<code class="php">$css = parse('css/'.$user['blog'].'.php');
$css['#selector']['color'];</code>

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