A simple PHP script that takes TTF files and produces subsetted WOFF2 files. Requires pyftsubset to perform the actual conversion

subset-fonts.php

<?php

$subsets = [
	"cyrillic-ext" => "U+0460-052F, U+1C80-1C88, U+20B4, U+2DE0-2DFF, U+A640-A69F, U+FE2E-FE2F",
	"cyrillic" => "+0400-045F, U+0490-0491, U+04B0-04B1, U+2116",
	"greek-ext" => "U+1F00-1FFF",
	"greek" => "U+0370-03FF",
	"latin-ext" => "U+0100-024F, U+0259, U+1E00-1EFF, U+2020, U+20A0-20AB, U+20AD-20CF, U+2113, U+2C60-2C7F, U+A720-A7FF",
	"latin" => "U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD"
];

$dir_files = scandir( __DIR__ );
$dir_fonts = array_filter( $dir_files, function( $item ){
	$extension = strtolower( pathinfo( $item, PATHINFO_EXTENSION ) );
	return $extension === 'ttf';
} );

foreach ( $dir_fonts as $font_file ) {
	$font_filename = pathinfo( $font_file, PATHINFO_FILENAME );
	foreach ( $subsets as $subset => $range ) {
		$output_filename = strtolower( $font_filename .'-'. $subset .'.woff2' );
		$cmnd = "pyftsubset {$font_file} --output-file={$output_filename} --flavor=woff2 --layout-features=\"*\" --unicodes=\"{$range}\"";
		echo $cmnd;
		`$cmnd`;
	}
}