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@ 2013-02-26T12:16:09Z

<?php

/*
 * convert square definition from x,y,l (x,y, length) to x1,y1,x2,y2
 */
function point($sq)
{
    return array(
        'x1' => $sq['x'],
        'y1' => $sq['y'],
        'x2' => $sq['x'] + $sq['l'],
        'y2' => $sq['y'] + $sq['l'],
    );
}

/*
 * return intersect square
 */
function intersect(array $ps)
{
    $r = max(array_map(function($e) { return $e['x1']; }, $ps));
    $l = min(array_map(function($e) { return $e['x2']; }, $ps));

    $t = max(array_map(function($e) { return $e['y1']; }, $ps));
    $b = min(array_map(function($e) { return $e['y2']; }, $ps));


    if ($r < $l && $b > $t) {
        return array(
            'x1' => $l,
            'y1' => $b,
            'x2' => $r,
            'y2' => $t,
        );
    }
    return false;
}

/*
 * return square area
 */
function area($sq) {
    return abs(($sq['x1'] -  $sq['x2']) * ($sq['y1'] -  $sq['y2']));
}

// input data
$sq1 = array('x' => 2, 'y' => 2, 'l' => 4);
$sq2 = array('x' => 3, 'y' => 2, 'l' => 4);

echo 'Intersect: ' . ((false !== $intersect = intersect(array(point($sq1), point($sq2)))) ? 'yes' : 'no') . PHP_EOL;
if (false !== $intersect) {
    echo 'Area: ' . area($intersect) . PHP_EOL;
}

Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 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 - 8.3.6: Intersect: yes Area: 12
Output for 5.1.0 - 5.1.6, 5.2.0 - 5.2.17: Parse error: syntax error, unexpected T_FUNCTION, expecting ')' in /in/T3I63 on line 21
Process exited with code 255.
Output for 5.0.0 - 5.0.5: Parse error: parse error, unexpected T_ARRAY, expecting '&' or T_VARIABLE in /in/T3I63 on line 19
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/T3I63 on line 19
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_ARRAY, expecting ')' in /in/T3I63 on line 19
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/T3I63 on line 19
Process exited with code 255.

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