Comp function to sort PHP Array by Bible Verses (Scripture Books)

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');

Sample array for input (n.b. typos are deliberate!):

Array
(
    [0] => Ruth
    [1] => Psalm 117
    [2] => Romans 16
    [3] => Matt 1:18-25
    [4] => Psalms 150
    [5] => Matthew 1:1-2:12
    [6] => Genesis 22
    [7] => Heb 11:1-3
    [8] => 1 Samuel 1
    [9] => 2 Thessalonians 2
    [10] => Genesis 3:15
    [11] => Zechariah 7
    [12] => John 17
    [13] => 2 Chrnicles 35
    [14] => John 21
    [15] => Acts 1
    [16] => Matthew 12
    [17] => Exodus 14-15
)