assocititive multi array compare php

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2NOTE: the diff_array also removes all the duplicate values that match to the values in the second array:
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6<?php
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8    $array1 = array("a","b","c","a","a");
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10    $array2 = array("a");
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14    $diff = array_diff($array1,$array2);
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18    // yields: array("b","c") the duplicate "a" values are removed 
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20?>
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