3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(); $a[] = &$a; var_dump($a); $a[0] = 1; var_dump($a); echo "-------------------\n"; $a = array(); $a[] = &$a; //$b = unserialize(serialize($a)); $b = $a; var_dump($a); $a[0] = 1; var_dump($a);
Output for 5.2.14 - 5.2.17, 5.3.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> &array(1) { [0]=> *RECURSION* } } int(1) ------------------- array(1) { [0]=> &array(1) { [0]=> *RECURSION* } } int(1)
Output for 5.1.0 - 5.2.13, 5.3.0 - 5.3.2
array(1) { [0]=> &array(1) { [0]=> &array(1) { [0]=> *RECURSION* } } } int(1) ------------------- array(1) { [0]=> &array(1) { [0]=> &array(1) { [0]=> *RECURSION* } } } int(1)
Output for 4.3.0 - 5.0.5
array(1) { [0]=> array(1) { [0]=> *RECURSION* } } int(1) ------------------- array(1) { [0]=> array(1) { [0]=> *RECURSION* } } array(1) { [0]=> int(1) }