roi-theme/minify-css.php

<?php
/**
 * Simple CSS Minifier Script
 * Run from command line: php minify-css.php
 */

function minify_css($css) {
    // Remove comments
    $css = preg_replace('!/\*[^*]*\*+([^/][^*]*\*+)*/!', '', $css);

    // Remove space after colons
    $css = str_replace(': ', ':', $css);

    // Remove whitespace
    $css = str_replace(array("\r\n", "\r", "\n", "\t", '  ', '    ', '    '), '', $css);

    // Remove space before and after specific characters
    $css = preg_replace('/\s*([{};,>+~])\s*/', '$1', $css);

    // Remove last semicolon before closing brace
    $css = str_replace(';}', '}', $css);

    // Trim
    $css = trim($css);

    return $css;
}

$files = [
    'Assets/Css/css-global-accessibility.css' => 'Assets/Css/css-global-accessibility.min.css',
    'Assets/Css/style.css' => 'Assets/Css/style.min.css',
];

$base_path = __DIR__ . '/';

foreach ($files as $source => $dest) {
    $source_path = $base_path . $source;
    $dest_path = $base_path . $dest;

    if (file_exists($source_path)) {
        $css = file_get_contents($source_path);
        $minified = minify_css($css);

        file_put_contents($dest_path, $minified);

        $original_size = strlen($css);
        $minified_size = strlen($minified);
        $savings = $original_size - $minified_size;
        $percent = round(($savings / $original_size) * 100, 1);

        echo "Minified: $source\n";
        echo "  Original: " . number_format($original_size) . " bytes\n";
        echo "  Minified: " . number_format($minified_size) . " bytes\n";
        echo "  Savings: " . number_format($savings) . " bytes ($percent%)\n\n";
    } else {
        echo "File not found: $source\n";
    }
}

echo "Done!\n";