What is the best way to determine which font styles are installed in PHP for use in graphics?

To determine which font styles are installed in PHP for use in graphics, you can use the `imagettftext()` function in PHP. This function requires the path to a TrueType font file as one of its parameters, so you can iterate through a directory of font files to see which ones are available for use. By checking each font file in the directory, you can determine which font styles are installed and ready to be used in your graphics.

$fontDirectory = '/path/to/fonts/directory';

$fonts = array_diff(scandir($fontDirectory), array('..', '.'));

foreach ($fonts as $font) {
    echo $font . "\n";
}