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<?php function func($a) { // void(); } $a['one'] = 1; func($a['two']); var_dump($a); ?>
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
Warning: Undefined array key "two" in /in/MRE7M on line 8 array(1) { ["one"]=> int(1) }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 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
Notice: Undefined index: two in /in/MRE7M on line 8 array(1) { ["one"]=> int(1) }
Output for 7.3.32 - 7.3.33
array(1) { ["one"]=> 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
Notice: Undefined index: two in /in/MRE7M on line 8 array(1) { ["one"]=> int(1) }

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