Online PHP editor | output for W1N7Y

@ 2018-07-23T15:20:55Z

<?php

$array = [2,2,2,1,1,0,0,8];
$values_cache = [];
usort($array, function ($a, $b) use (&$values_cache) {
    $key_a = isset($values_cache[$a]) ? $values_cache[$a] : ($values_cache[$a] = keyfn($a));
    $key_b = isset($values_cache[$b]) ? $values_cache[$b] : ($values_cache[$b] = keyfn($b));
    return $key_a <=> $key_b;
});
echo '<pre>', print_r($array), '</pre>';    // TODO

function keyfn($v) {
    echo 'call a keyfn' . PHP_EOL;
    return 2 * $v;
}

Output for 7.1.0 - 7.1.20, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0: call a keyfn call a keyfn call a keyfn call a keyfn <pre>Array ( [0] => 0 [1] => 0 [2] => 1 [3] => 1 [4] => 2 [5] => 2 [6] => 2 [7] => 8 ) 1</pre>
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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