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run code in 200+ php & hhvm versions
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<?php $variable= " 78"; $elem = [$variable=>'Res',78=>'Chan']; print gettype($variable); var_dump($elem); print $elem["78"];
based on Cekkp
Output for 5.4.0 - 7.2.0
stringarray(2) { [" 78"]=> string(3) "Res" [78]=> string(4) "Chan" } Chan
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/atTAE 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 '[' in /in/atTAE on line 4
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/atTAE on line 4
Process exited with code 255.