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run code in 200+ php & hhvm versions
Bugs & Features
<?php define('FOO', array_flip(array('foo' => 'bar'))); var_dump(current(FOO));
Output for 7.0.0 - 7.2.6
string(3) "foo"
Output for hhvm-3.10.1 - 3.17.3
Warning: Constants may only evaluate to scalar values in /in/6ZY7U on line 2 Notice: Use of undefined constant FOO - assumed 'FOO' in /in/6ZY7U on line 3 Warning: Invalid operand type was used: expecting an array in /in/6ZY7U on line 3 bool(false)
Output for 5.3.0 - 5.6.30
Warning: Constants may only evaluate to scalar values in /in/6ZY7U on line 2 Notice: Use of undefined constant FOO - assumed 'FOO' in /in/6ZY7U on line 3 Warning: current() expects parameter 1 to be array, string given in /in/6ZY7U on line 3 NULL
Output for 4.4.1, 5.1.0 - 5.2.17
Warning: Constants may only evaluate to scalar values in /in/6ZY7U on line 2 Notice: Use of undefined constant FOO - assumed 'FOO' in /in/6ZY7U on line 3 Warning: current(): Passed variable is not an array or object in /in/6ZY7U on line 3 bool(false)
Output for 4.3.2 - 4.4.0, 4.4.2 - 5.0.5
Fatal error: Only variables can be passed by reference in /in/6ZY7U on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Only variables can be passed by reference in /in/6ZY7U on line 3