Online PHP editor | output for EQtXT

@ 2015-03-27T12:03:19Z

<?php

/**
 * @param array $numbers
 *
 * @return array
 */
function find_even(array $numbers) {
    if (count($numbers) === 0) {
        return [];
    }

    if (count($numbers) === 1) {
        return has_even($numbers) ? $numbers : [];
    }

    list($left, $right) = array_chunk($numbers, ceil(count($numbers) / 2));

    $left  = has_even($left) ? $left : [];
    $right = has_even($right) ? $right : [];

    $leftResult  = (count($left) > 1) ? find_even($left) : $left;
    $rightResult = (count($right) > 1) ? find_even($right) : $right;

    return array_merge($leftResult, $rightResult);
}

/**
 * @param array $numbers
 *
 * @return bool
 */
function has_even(array $numbers) {
    echo join(' ', $numbers) . PHP_EOL;

    foreach ($numbers as $number) {
        if ($number % 2 === 0) {
            return true;
        }
    }
    return false;
}

$numbers = [1, 2, 3, 7, 5, 7, 1, 3, 4, 9, 7, 3, 5, 7, 9];
echo join(' ', $numbers) . PHP_EOL . PHP_EOL;

echo PHP_EOL . join(' ', find_even($numbers)) . PHP_EOL;

Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.16 - 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 - 8.3.7: 1 2 3 7 5 7 1 3 4 9 7 3 5 7 9 1 2 3 7 5 7 1 3 4 9 7 3 5 7 9 1 2 3 7 5 7 1 3 1 2 3 7 1 2 4 9 7 3 5 7 9 4 9 7 3 4 9 2 4
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 '[' in /in/EQtXT on line 10
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/EQtXT on line 8
Process exited with code 255.
Output for 4.4.2 - 4.4.9: Parse error: syntax error, unexpected T_ARRAY, expecting ')' in /in/EQtXT on line 8
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/EQtXT on line 8
Process exited with code 255.
Output for 4.3.2 - 4.3.4: Parse error: parse error, expecting `')'' in /in/EQtXT on line 8
Process exited with code 255.

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