Online PHP editor | output for 6v9O2

@ 2014-09-05T09:46:59Z

<?php
function similarity(w1,w2) {
	//return cosine similarity of w1 and w2 using formula in the
	//definition here: http://en.wikipedia.org/wiki/Cosine_similarity
	
	//get numerator:
	$numerator = 0;
	for($i = 0, $l = count($w1); $i < $l; $i++) $numerator += $w1[$i]*$w2[$i];
	
	//get abs(w1) and abs(w2)
	$abs_w1 = 0, $abs_w2 = 0;
	for($i = 0, $l = count($w1); $i < $l; $i++) {
		$abs_w1 += $w1*$w1;
		$abs_w2 += $w2*$w2;
	}
	$abs_w1 = sqrt($abs_w1);
	$abs_w2 = sqrt($abs_w2);
	
	//make denominator:
	$denominator = $abs_w1*$abs_w2;
	
	return $numerator/$denominator;
}

similarity([1,2,3,4,5,6,7,8,9],[1,2,3,4,5,6,7,8,88])

Output for 5.4.0 - 5.4.32: Parse error: syntax error, unexpected ',', expecting '&' or variable (T_VARIABLE) in /in/6v9O2 on line 2
Process exited with code 255.
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29: Parse error: syntax error, unexpected ',', expecting '&' or T_VARIABLE in /in/6v9O2 on line 2
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected ',', expecting '&' or T_VARIABLE in /in/6v9O2 on line 2
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_STRING, expecting ')' in /in/6v9O2 on line 2
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1: Parse error: parse error, unexpected T_STRING, expecting ')' in /in/6v9O2 on line 2
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/6v9O2 on line 2
Process exited with code 255.

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