Online PHP editor | output for AIuGp

Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /in/AIuGp on line 3 array(1) { [0]=> string(0) "" } Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /in/AIuGp on line 5 string(4) ",1,2"
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 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30: array(1) { [0]=> string(0) "" } string(4) ",1,2"