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run code in 200+ php & hhvm versions
Bugs & Features
<?php $a = array(7=>1, 2, 3); var_dump($a); $a[] = 4; var_dump($a); $a[2] = 5; var_dump($a); array_unshift($a, 6); var_dump($a); echo $a[7];
based on PpC2R
Output for 5.3.0 - 7.2.0
array(3) { [7]=> int(1) [8]=> int(2) [9]=> int(3) } array(4) { [7]=> int(1) [8]=> int(2) [9]=> int(3) [10]=> int(4) } array(5) { [7]=> int(1) [8]=> int(2) [9]=> int(3) [10]=> int(4) [2]=> int(5) } array(6) { [0]=> int(6) [1]=> int(1) [2]=> int(2) [3]=> int(3) [4]=> int(4) [5]=> int(5) } Notice: Undefined offset: 7 in /in/l0Rm4 on line 10
Output for 4.3.0 - 5.2.17
array(3) { [7]=> int(1) [8]=> int(2) [9]=> int(3) } array(4) { [7]=> int(1) [8]=> int(2) [9]=> int(3) [10]=> int(4) } array(5) { [7]=> int(1) [8]=> int(2) [9]=> int(3) [10]=> int(4) [2]=> int(5) } array(6) { [0]=> int(6) [1]=> int(1) [2]=> int(2) [3]=> int(3) [4]=> int(4) [5]=> int(5) } Notice: Undefined offset: 7 in /in/l0Rm4 on line 10