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<?php $k = (string)"0"; $a = array( 'name' => 'a', $k => 'null' ); $b = array( 'name' => 'b', $k => 'zero' ); $b = array( $k => 'zeronull', 'name' => 'b' ); var_dump($a); var_dump($b); var_dump($c); var_dump(array_merge($a, $b)); var_dump(array_merge($a, $c)); var_dump(array_merge($a, $b, $c));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(2) { ["name"]=> string(1) "a" [0]=> string(4) "null" } array(2) { [0]=> string(8) "zeronull" ["name"]=> string(1) "b" } Warning: Undefined variable $c in /in/WTr0J on line 10 NULL array(3) { ["name"]=> string(1) "b" [0]=> string(4) "null" [1]=> string(8) "zeronull" } Warning: Undefined variable $c in /in/WTr0J on line 12 Fatal error: Uncaught TypeError: array_merge(): Argument #2 must be of type array, null given in /in/WTr0J:12 Stack trace: #0 /in/WTr0J(12): array_merge(Array, NULL) #1 {main} thrown in /in/WTr0J on line 12
Process exited with code 255.
Output for 7.3.12 - 7.3.31, 7.4.0 - 7.4.33
array(2) { ["name"]=> string(1) "a" [0]=> string(4) "null" } array(2) { [0]=> string(8) "zeronull" ["name"]=> string(1) "b" } Notice: Undefined variable: c in /in/WTr0J on line 10 NULL array(3) { ["name"]=> string(1) "b" [0]=> string(4) "null" [1]=> string(8) "zeronull" } Notice: Undefined variable: c in /in/WTr0J on line 12 Warning: array_merge(): Expected parameter 2 to be an array, null given in /in/WTr0J on line 12 NULL Notice: Undefined variable: c in /in/WTr0J on line 13 Warning: array_merge(): Expected parameter 3 to be an array, null given in /in/WTr0J on line 13 NULL
Output for 7.3.32 - 7.3.33
array(2) { ["name"]=> string(1) "a" [0]=> string(4) "null" } array(2) { [0]=> string(8) "zeronull" ["name"]=> string(1) "b" } NULL array(3) { ["name"]=> string(1) "b" [0]=> string(4) "null" [1]=> string(8) "zeronull" } Warning: array_merge(): Expected parameter 2 to be an array, null given in /in/WTr0J on line 12 NULL Warning: array_merge(): Expected parameter 3 to be an array, null given in /in/WTr0J on line 13 NULL
Output for 5.0.4 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 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 - 7.1.10, 7.2.0 - 7.2.33
array(2) { ["name"]=> string(1) "a" [0]=> string(4) "null" } array(2) { [0]=> string(8) "zeronull" ["name"]=> string(1) "b" } Notice: Undefined variable: c in /in/WTr0J on line 10 NULL array(3) { ["name"]=> string(1) "b" [0]=> string(4) "null" [1]=> string(8) "zeronull" } Notice: Undefined variable: c in /in/WTr0J on line 12 Warning: array_merge(): Argument #2 is not an array in /in/WTr0J on line 12 NULL Notice: Undefined variable: c in /in/WTr0J on line 13 Warning: array_merge(): Argument #3 is not an array in /in/WTr0J on line 13 NULL
Output for 5.0.0 - 5.0.3
array(2) { ["name"]=> string(1) "a" [0]=> string(4) "null" } array(2) { [0]=> string(8) "zeronull" ["name"]=> string(1) "b" } Notice: Undefined variable: c in /in/WTr0J on line 10 NULL array(3) { ["name"]=> string(1) "b" [0]=> string(4) "null" [1]=> string(8) "zeronull" } Notice: Undefined variable: c in /in/WTr0J on line 12 Warning: array_merge(): Argument #2 is not an array in /in/WTr0J on line 12 NULL Notice: Undefined variable: c in /in/WTr0J on line 13 Warning: array_merge(): Argument #3 is not an array in /in/WTr0J on line 13 NULL
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9
array(2) { ["name"]=> string(1) "a" [0]=> string(4) "null" } array(2) { [0]=> string(8) "zeronull" ["name"]=> string(1) "b" } Notice: Undefined variable: c in /in/WTr0J on line 10 NULL array(3) { ["name"]=> string(1) "b" [0]=> string(4) "null" [1]=> string(8) "zeronull" } Notice: Undefined variable: c in /in/WTr0J on line 12 array(2) { ["name"]=> string(1) "a" [0]=> string(4) "null" } Notice: Undefined variable: c in /in/WTr0J on line 13 array(3) { ["name"]=> string(1) "b" [0]=> string(4) "null" [1]=> string(8) "zeronull" }

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