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<?php $test = array(); $test['yo'}[] = 123; var_dump($test);
Output for 5.3.0 - 5.3.19, 5.4.0 - 5.4.9
Parse error: syntax error, unexpected '}', expecting ']' in /in/0gq3q on line 5
Process exited with code 255.
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174.28 ms | 1399 KiB | 37 Q