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run code in 150+ php & hhvm versions
Bugs & Features
<?php function getDialogKey($message) { $ids = array_flip([$message['id_profile_from'], $message['id_profile_to']]); ksort($ids, SORT_NUMERIC); return implode('_', array_flip($ids)); } var_dump(getDialogKey([ 'id_profile_from' => 1905, 'id_profile_to' => 1683, ]));
Output for 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(9) "1683_1905"
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/7QBbt on line 5
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/7QBbt on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `')'' in /in/7QBbt on line 5
Process exited with code 255.