Online PHP editor | output for bMI5L

@ 2016-04-26T13:46:04Z

<?php

$a = [1, 2];
$b = [2, 4];

$p = [4, 3];

function vector_2d(array $v1, array $v2) {
	return [$v2[0] - $v1[0], $v2[1] - $v1[1]];
}

function dot_product(array $v1, array $v2) {
	return $v1[0]*$v2[0] + $v1[1]*$v2[1];
}

function modulus(array $v) {
	return sqrt($v[0]**2 + $v[1]**2);
}

$pa = vector_2d($p, $a);
$ab = vector_2d($a, $b);

$mpa = modulus($pa);
$mab = modulus($ab);

$theta = acos(dot_product($pa, $ab)/($mpa*$mab));

$perp_dist = $mpa*sin($theta);

echo $perp_dist;

Output for 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: 2.2360679774998
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 2.2360679774998
Output for 5.5.0 - 5.5.35: Parse error: syntax error, unexpected '*' in /in/bMI5L on line 17
Process exited with code 255.

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