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<?php $var = 'test' . 'test'; var_dump($var); $var = 'test' + 'test'; var_dump($var);
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
string(8) "testtest" Fatal error: Uncaught TypeError: Unsupported operand types: string + string in /in/DFLLj:6 Stack trace: #0 {main} thrown in /in/DFLLj on line 6
Process exited with code 255.
Output for 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
string(8) "testtest" Warning: A non-numeric value encountered in /in/DFLLj on line 6 Warning: A non-numeric value encountered in /in/DFLLj on line 6 int(0)
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20
string(8) "testtest" int(0)

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