How Can I Extract Class Names Containing 'postclass' from a CSS File Using PHP?

Utilize PHP to Parse a CSS File

With PHP, you can parse a CSS file to extract specific information. This article will guide you through a custom parsing method that focuses on identifying class names containing the string "postclass."

Custom PHP Parsing Function

The following PHP function can be used to parse a CSS file and return an array of class names that include "postclass":

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;
}

Example Usage:

To use the function, pass the CSS file path as an argument:

$css = parse('css/'.$user['blog'].'.php');
echo $css['#selector']['color']; // Outputs the value of the 'color' property for the '#selector' class with 'postclass' in its name

This function parses the CSS file into an associative array where the keys are CSS selectors and the values are associative arrays of property names and values. By accessing the appropriate array index, you can retrieve the desired information, such as class names containing "postclass."

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