fontawesome icons class to php contants

fa.php

<?php

$pattern = '/\.fa-(.*):/';
$subject = file_get_contents('font-awesome.css');

preg_match_all($pattern, $subject, $matches);
$matches = $matches[1];

$string = '';

foreach($matches as $match){
    $match = 'fa-' . $match;
    $string .= "const " . strtoupper(str_replace('-', '_', $match)) . " = '" . $match . "';\n";
}

file_put_contents('faconst.php', "<?php\n\n" . $string );