Data commit

Task/Symmetric-difference/PHP/symmetric-difference.php

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+<?php
+$a = array('John', 'Bob', 'Mary', 'Serena');
+$b = array('Jim', 'Mary', 'John', 'Bob');
+
+// Remove any duplicates
+$a = array_unique($a);
+$b = array_unique($b);
+
+// Get the individual differences, using array_diff()
+$a_minus_b = array_diff($a, $b);
+$b_minus_a = array_diff($b, $a);
+
+// Simply merge them together to get the symmetric difference
+$symmetric_difference = array_merge($a_minus_b, $b_minus_a);
+
+// Present our results.
+echo 'List A:               ', implode(', ', $a),
+   "\nList B:               ", implode(', ', $b),
+  "\nA \\ B:                ", implode(', ', $a_minus_b),
+  "\nB \\ A:                ", implode(', ', $b_minus_a),
+   "\nSymmetric difference: ", implode(', ', $symmetric_difference), "\n";
+?>