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run code in 150+ php & hhvm versions
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<?php error_reporting(0); function vOriginal($cParentID) { if ($cParentID > -1) { if($cParentID != $stopAt) { echo "\t\tAdd to array\n"; } echo "\t\tRecursive call\n"; } } function v1128($cParentID) { if ($cParentID > 0) { echo "\t\tAdd to array\n"; echo "\t\tRecursive call\n"; } } function v1229($cParentID) { if ($cParentID > -1) { echo "\t\tAdd to array\n"; echo "\t\tRecursive call\n"; } } $cParentID = 1; echo "cParentID = "; var_dump($cParentID); echo "\tvOriginal\n"; vOriginal($cParentID); echo "\tv1128\n"; v1128($cParentID); echo "\tv1229\n"; v1229($cParentID); $cParentID = 0; echo "cParentID = "; var_dump($cParentID); echo "\tvOriginal\n"; vOriginal($cParentID); echo "\tv1128\n"; v1128($cParentID); echo "\tv1229\n"; v1229($cParentID); $cParentID = null; echo "cParentID = "; var_dump($cParentID); echo "\tvOriginal\n"; vOriginal($cParentID); echo "\tv1128\n"; v1128($cParentID); echo "\tv1229\n"; v1229($cParentID);
Output for 4.3.0 - 7.1.0
cParentID = int(1) vOriginal Add to array Recursive call v1128 Add to array Recursive call v1229 Add to array Recursive call cParentID = int(0) vOriginal Recursive call v1128 v1229 Add to array Recursive call cParentID = NULL vOriginal v1128 v1229