3v4l.org

run code in 300+ PHP versions simultaneously
<?php $b = array(); $b['test'] = 'Hullo'; echo "B Foo is "; echo $b['foo'];
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
B Foo is Warning: Undefined array key "foo" in /in/1p2or on line 5
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
B Foo is Notice: Undefined index: foo in /in/1p2or on line 5
Output for 7.3.32 - 7.3.33
B Foo is
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
B Foo is Notice: Undefined index: foo in /in/1p2or on line 5

preferences:
222.98 ms | 402 KiB | 418 Q