PHP Sort by Scripture (Bible)

 function scripturesort($a, $b) {
      if ($a == $b) {return 0;}
	    $order=array("Genesis", "Exodus", "Leviticus", "Numbers", "Deuteronomy", "Joshua", "Judges", "Ruth", "1 Samuel", "2 Samuel", "1 Kings", "2 Kings", "1 Chronicles", "2 Chronicles", "Ezra", "Nehemiah", "Esther", "Job", "Psalm", "Proverbs", "Ecclesiastes", "Song of Solomon", "Isaiah", "Jeremiah", "Lamentations", "Ezekiel", "Daniel", "Hosea", "Joel", "Amos", "Obadiah", "Jonah", "Micah", "Nahum", "Habakkuk", "Zephaniah", "Haggai", "Zechariah", "Malachi", "Matthew", "Mark", "Luke", "John", "Acts", "Romans", "1 Corinthians", "2 Corinthians", "Galatians", "Ephesians", "Philippians", "Colossians", "1 Thessalonians", "2 Thessalonians", "1 Timothy", "2 Timothy", "Titus", "Philemon", "Hebrews", "James", "1 Peter", "2 Peter", "1 John", "2 John", "3 John", "Jude", "Revelation");

	    $fa = $a;
	    $fb = $b;
	    
	    preg_match('/^..(.+?)\b/', $a, $matches);
	    $a = trim(substr($matches[0],0,4));

	    preg_match('/^..(.+?)\b/', $b, $matches);
	    $b = trim(substr($matches[0],0,4));

	    similar_text($a, $b, $p);
	    if($p > 75) {
	    	preg_match('/(.+?)([\d]+)/', $fa, $matches);
	    	$na = intval($matches[2]);
	    	preg_match('/(.+?)([\d]+)/', $fb, $matches);
	    	$nb = intval($matches[2]);
	    	if($na == $nb) {
		    	preg_match('/(.+?)([\d]+).*?:([\d]+)/', $fa, $matches);
		    	$n2a = intval($matches[3]);
		    	preg_match('/(.+?)([\d]+).*?:([\d]+)/', $fb, $matches);
		    	$n2b = intval($matches[3]);
		    	return ($n2a < $n2b) ? -1 : 1;
	    	} else
	    	return ($na < $nb) ? -1 : 1;
	    }

	    $position = key(preg_grep('/^'.$a.'(.*)\b/', $order));
	    $position2 = key(preg_grep('/^'.$b.'(.*)\b/', $order));

	    if ($position2!==false && $position!==false) {return ($position < $position2) ? -1 : 1;}
	    if($position!==false) {return -1;}
	    if($position2!==false) {return 1;}

	    return ($a < $b) ? -1 : 1;
	}
  
  usort($scriptures, 'scripturesort');