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<?php $a=array( 'x'=>'111', 'y'=>'22', ); $b=array( 'x'=>'333' ); var_dump($a+b, $b+$a, array_merge($a,$b),array_merge($b,$a));
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
Fatal error: Uncaught Error: Undefined constant "b" in /in/Cn8rL:14 Stack trace: #0 {main} thrown in /in/Cn8rL on line 14
Process exited with code 255.
Output for 7.2.5 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/Cn8rL on line 14 Warning: A non-numeric value encountered in /in/Cn8rL on line 14 Fatal error: Uncaught Error: Unsupported operand types in /in/Cn8rL:14 Stack trace: #0 {main} thrown in /in/Cn8rL on line 14
Process exited with code 255.
Output for 7.1.0 - 7.1.20
Notice: Use of undefined constant b - assumed 'b' in /in/Cn8rL on line 14 Warning: A non-numeric value encountered in /in/Cn8rL on line 14 Fatal error: Uncaught Error: Unsupported operand types in /in/Cn8rL:14 Stack trace: #0 {main} thrown in /in/Cn8rL on line 14
Process exited with code 255.
Output for 7.0.0 - 7.0.20
Notice: Use of undefined constant b - assumed 'b' in /in/Cn8rL on line 14 Fatal error: Uncaught Error: Unsupported operand types in /in/Cn8rL:14 Stack trace: #0 {main} thrown in /in/Cn8rL on line 14
Process exited with code 255.
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 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
Notice: Use of undefined constant b - assumed 'b' in /in/Cn8rL on line 14 Fatal error: Unsupported operand types in /in/Cn8rL on line 14
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Notice: Use of undefined constant b - assumed 'b' in /in/Cn8rL on line 14 Fatal error: Unsupported operand types in /in/Cn8rL on line 14

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