3v4l.org

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<?php $array = array ('a','b','c','d'); $keys = array_keys($array); for ($i = 0; $i < count($keys); $i++) { $cur = $array[$keys[$i]]; $next = $array[$keys[$i+1]]; echo "current item: ".$cur; echo "\n"; echo "current item: ".$next; }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
current item: a current item: bcurrent item: b current item: ccurrent item: c current item: d Warning: Undefined array key 4 in /in/0Qs9L on line 8 Warning: Undefined array key "" in /in/0Qs9L on line 8 current item: d current item:
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
current item: a current item: bcurrent item: b current item: ccurrent item: c current item: d Notice: Undefined offset: 4 in /in/0Qs9L on line 8 Notice: Undefined index: in /in/0Qs9L on line 8 current item: d current item:
Output for 7.3.32 - 7.3.33
current item: a current item: bcurrent item: b current item: ccurrent item: c current item: dcurrent item: d current item:
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
current item: a current item: bcurrent item: b current item: ccurrent item: c current item: d Notice: Undefined offset: 4 in /in/0Qs9L on line 8 Notice: Undefined index: in /in/0Qs9L on line 8 current item: d current item:
preferences:
221.64 ms | 403 KiB | 358 Q