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<?php $x=array('a'=>1,'b'=>2); $y=array('c'=>3,'a'=>4); var_dump($x+$y); var_dump(array_merge($a,$b));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } Warning: Undefined variable $a in /in/kdACp on line 6 Warning: Undefined variable $b in /in/kdACp on line 6 Fatal error: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /in/kdACp:6 Stack trace: #0 /in/kdACp(6): array_merge(NULL, NULL) #1 {main} thrown in /in/kdACp on line 6
Process exited with code 255.
Output for 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } Notice: Undefined variable: a in /in/kdACp on line 6 Notice: Undefined variable: b in /in/kdACp on line 6 Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/kdACp on line 6 NULL
Output for 7.3.32 - 7.3.33
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } Warning: array_merge(): Expected parameter 1 to be an array, null given in /in/kdACp on line 6 NULL
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.7 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } Notice: Undefined variable: a in /in/kdACp on line 6 Notice: Undefined variable: b in /in/kdACp on line 6 Warning: array_merge(): Argument #1 is not an array in /in/kdACp on line 6 NULL
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } Notice: Undefined variable: a in /in/kdACp on line 6 Notice: Undefined variable: b in /in/kdACp on line 6 Warning: array_merge(): Argument #1 is not an array in /in/kdACp on line 6 Warning: array_merge(): Argument #2 is not an array in /in/kdACp on line 6 NULL
Output for 5.0.0 - 5.0.3
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } Notice: Undefined variable: a in /in/kdACp on line 6 Notice: Undefined variable: b in /in/kdACp on line 6 Warning: array_merge(): Argument #1 is not an array in /in/kdACp on line 6 Warning: array_merge(): Argument #2 is not an array in /in/kdACp on line 6 NULL
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
array(3) { ["a"]=> int(1) ["b"]=> int(2) ["c"]=> int(3) } Notice: Undefined variable: a in /in/kdACp on line 6 Notice: Undefined variable: b in /in/kdACp on line 6 array(0) { }

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