How Can I Extract Specific Class Names from a CSS File Using PHP?

Parse a CSS File with PHP

In PHP, parsing a CSS file requires special techniques to extract specific information. To illustrate, let's consider the task of retrieving class names containing "postclass" from a CSS file.

To achieve this, we can leverage regular expressions. Here's a solution:

<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(":", $strRule);
                $rules_arr[trim($rule[0])] = trim($rule[1]);
            }
        }

        $selectors = explode(',', trim($selector));
        foreach ($selectors as $strSel){
            $result[$strSel] = $rules_arr;
        }
    }
    return $result;
}</code>

With this function, you can parse a CSS file and access specific classes and their properties. For instance, to retrieve the color property of the "#selector" class, use:

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

This solution allows you to parse CSS files dynamically in your PHP applications, extracting tailored information based on user-defined criteria.

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