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run code in 300+ PHP versions simultaneously
<?php $a = array(1); debug_zval_dump($a); end((((((((((((((((((array_keys($a))))))))))))))))))); debug_zval_dump($a);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(1) refcount(3){ [0]=> int(1) } Notice: Only variables should be passed by reference in /in/MDFi3 on line 5 array(1) refcount(3){ [0]=> int(1) }
Output for 7.3.32 - 7.3.33
array(1) refcount(3){ [0]=> int(1) } array(1) refcount(3){ [0]=> int(1) }
Output for 7.0.0 - 7.0.33
array(1) refcount(2){ [0]=> int(1) } Notice: Only variables should be passed by reference in /in/MDFi3 on line 5 array(1) refcount(2){ [0]=> int(1) }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
array(1) refcount(2){ [0]=> long(1) refcount(1) } array(1) refcount(2){ [0]=> long(1) refcount(1) }

preferences:
297.37 ms | 403 KiB | 459 Q