What steps can be taken to determine the availability of specific fonts on a server for PHP applications?

To determine the availability of specific fonts on a server for PHP applications, you can use the `imagettfbbox` function in PHP to check if a font file exists on the server. This function calculates the bounding box in pixels for a TrueType text using the specified font file.

$fontFile = '/path/to/font.ttf';

if (file_exists($fontFile)) {
    $bbox = imagettfbbox($fontSize, 0, $fontFile, $text);
    
    if ($bbox !== false) {
        echo 'Font is available on the server.';
    } else {
        echo 'Font file is not valid.';
    }
} else {
    echo 'Font file does not exist on the server.';
}