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run code in 200+ php & hhvm versions
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<?php $id = '1--2--3'; var_dump(implode('--',array_pop(explode('--',$id))));
based on qKZov
Output for 7.0.0 - 7.2.0
Notice: Only variables should be passed by reference in /in/ARsW0 on line 5 Warning: implode(): Invalid arguments passed in /in/ARsW0 on line 5 NULL
Output for 5.3.22 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/ARsW0 on line 5 Warning: implode(): Invalid arguments passed in /in/ARsW0 on line 5 NULL