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run code in 300+ PHP versions simultaneously
<?php $i = 0; function is_cyclic(array &$array) { global $i; // Exit when too deep. if (++$i > 10) exit; echo "Call $i:\n"; var_dump($array); echo "\n"; $lastKey = array_key_last($array); if ($lastKey === null) { // Array is empty return false; } static $marker; if ($marker === null) { $marker = new stdClass(); } if ($array[$lastKey] === $marker) { return true; } $array[] = $marker; foreach ($array as &$item) { if (is_array($item) && is_cyclic($item)) { //array_pop($array); return true; } } //array_pop($array); return false; } function craft_bomb() { $array = [1, [2, 3]]; $array[1][1] = &$array; return $array; } $bomb = craft_bomb(); is_cyclic($bomb);
Output for 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 1: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 2: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } Call 3: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 4: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } Call 5: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 6: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } Call 7: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 8: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } Call 9: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } Call 10: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } }
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.
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Call 1: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } } Call 2: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } } Call 3: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } } Call 4: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } } Call 5: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } } Call 6: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } } Call 7: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } } Call 8: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } } Call 9: array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> *RECURSION* } } } Call 10: array(2) { [0]=> int(2) [1]=> array(2) { [0]=> int(1) [1]=> array(2) { [0]=> int(2) [1]=> *RECURSION* } } }
preferences:
123.6 ms | 415 KiB | 5 Q