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<?php $items = array(10, 20, 30); $items1 = array(11, 21, 31); $udiff = array_udiff($items, $items1, function ($a, $b) { $result = $a === $b; print("Comparing $a to $b, result is $result\n"); return $result; }); var_dump($udiff);
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Comparing 10 to 20, result is Deprecated: array_udiff(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/UT3i5 on line 7 Comparing 20 to 10, result is Comparing 20 to 30, result is Comparing 30 to 20, result is Comparing 11 to 21, result is Comparing 21 to 11, result is Comparing 21 to 31, result is Comparing 31 to 21, result is Comparing 10 to 11, result is Comparing 11 to 10, result is Comparing 10 to 20, result is Comparing 20 to 10, result is Comparing 20 to 30, result is Comparing 30 to 20, result is array(0) { }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Comparing 10 to 20, result is Deprecated: array_udiff(): Returning bool from comparison function is deprecated, return an integer less than, equal to, or greater than zero in /in/UT3i5 on line 11 Comparing 20 to 10, result is Comparing 20 to 30, result is Comparing 30 to 20, result is Comparing 11 to 21, result is Comparing 21 to 11, result is Comparing 21 to 31, result is Comparing 31 to 21, result is Comparing 10 to 11, result is Comparing 11 to 10, result is Comparing 10 to 20, result is Comparing 20 to 10, result is Comparing 20 to 30, result is Comparing 30 to 20, result is array(0) { }
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Comparing 10 to 20, result is Comparing 20 to 30, result is Comparing 11 to 21, result is Comparing 21 to 31, result is Comparing 10 to 11, result is Comparing 10 to 20, result is Comparing 20 to 30, result is array(0) { }
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
Comparing 20 to 10, result is Comparing 30 to 20, result is Comparing 21 to 11, result is Comparing 31 to 21, result is Comparing 30 to 31, result is Comparing 30 to 20, result is Comparing 20 to 10, result is array(0) { }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected T_FUNCTION in /in/UT3i5 on line 7
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected T_FUNCTION in /in/UT3i5 on line 7
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/UT3i5 on line 7
Process exited with code 255.
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