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run code in 150+ php & hhvm versions
Bugs & Features
<?php print_r(array_merge( ['test' => 0, 'shmest' => 0, 'fest' => 0], // original ['test' => 1], ['shmest' => 1], ['shmest' => 2, 'fest' => 3] ));
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Array ( [test] => 1 [shmest] => 2 [fest] => 3 )
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[', expecting ')' in /in/bNOU2 on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[', expecting ')' in /in/bNOU2 on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/bNOU2 on line 4
Process exited with code 255.