How to Extract Class Names from a CSS File with a Specific Substring in PHP?

Parsing a CSS File with PHP

In PHP, parsing a CSS file involves extracting and manipulating specific data from its content. One common task is to identify class names that contain a particular substring. Here's a solution using a regular expression:

function parseCSS($file) {
    $css = file_get_contents($file);
    preg_match_all('/#(?P<selector>\S+)\s+.postclass.*?\{.*?}/s', $css, $matches);
    return $matches['selector'] ?? [];
}

This function takes a CSS file path as input, loads its content, and searches for lines that start with a hashtag (#), followed by any characters (except whitespace or newlines), and a dot (.postclass). The matches are captured in the 'selector' named capture group.

To use the function, for example, to extract class names containing "postclass":

$cssFile = 'cssfile.css';
$classNames = parseCSS($cssFile);
print_r($classNames);

This will output an array with elements like:

["#content.postclass-subcontent", "#content2.postclass-subcontent2"]

The result can then be used to further manipulate or analyze the CSS class names based on the desired requirements.

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