Typekit Font Family Name Fix.php

<?php
// Why? After consolidating mutliple typekit accounts into one account,
// typekit renamed all our font-family CSS properties with a `-1` at the end of each font name.
//
// Story / Logic:
// If, string has no capitals, and string has no spaces,
// and string is not `serif` or `sans-serif`,
// then duplicate the true results and add `-1` to the end of each match...
// finally, add new font family name that matched to the beginning of the string of fonts.

$font_families = "source-sans-pro, 'verb', 'Source Sans Pro', sans-serif, serif"; // should match
$font_false = "'Arial'"; // should not match
$font_single = "'helvetica'"; // should match

function remove_quotes($text) {
  // Regex to get any combination of quotes around font-family value
  $regex = '(\'|")(.*?)(\'|")';
  $text = preg_replace('/'.$regex.'/', "$2", trim($text));
  return $text;
}
function typekit_match_conditionals($font) {
  // get rid of outer spacing
  $font_item = trim($font);
  // eliminate capitalized font names, typekit wont refer to capitalize font names
  $capitals = preg_match('/[A-Z]/', $font_item);
  // eliminate spaces in font names, typekit wont refer to font names with spaces in them
  $spaces = preg_match('/\s/',$font_item);
  // `serif` and `sans-serif` are common fallbacks that do not rely on typekit, we ignore these font names
  $serif = strpos($font_item, 'serif') == 0 && strlen($font_item) == 5 ? true : false;
  $sans_serif = strpos($font_item, 'sans-serif') == 0 && strlen($font_item) == 10 ? true : false;
  // Let's use the vars from above to match possible typekit references and return true or false
  if ($spaces == 0 && $capitals == 0 && $sans_serif != true && $serif != true) {
    $conditionals = true;
  } else {
    $conditionals = false;
  }
  return $conditionals;
}

function typekit_match($fonts) {
  if (strpos($fonts, ',') !== false) {
    $fonts_array = explode(',', $fonts);
    foreach ($fonts_array as $font) {
      // If any of the fonts are formatted like a typekit font, add `-1`
      // then prepend the font back into the font family array
      if (typekit_match_conditionals($font)) {
        // remove quotes
        $font = remove_quotes($font);
        array_unshift($fonts_array, $font.'-1');
      }
    }
    // Revert the font family array back into a comma separated list
    $fonts_updated = trim(implode(",",$fonts_array));
    return $fonts_updated;
  } elseif (typekit_match_conditionals($fonts)) {
    $fonts_updated = remove_quotes($fonts).'-1,'.$fonts;
    return $fonts_updated;
  } else {
    return $fonts;
  }
}

echo typekit_match($font_families)."<br>\r\n";
echo typekit_match($font_false)."<br>\r\n";
echo typekit_match($font_single);