How to delete duplicate elements in a PHP array

Our previous article described how to delete headers, tails, arbitrary elements in the PHP array, and this article tells us to delete the repeating elements in the array by using the Array_unique () function.

The Array_unique () function, which sorts the values of an array element as a string, then retains only the first key name for each value, ignoring all subsequent key names, or deleting the repeating elements in the array.

The syntax format is as follows:

Array arry_unique (array array)

The parameter array is an input array.

The following example causes the Array_unique () function to delete the duplicate elements in the array, with the following example code:

<?phpheader ("content-type:text/html; Charset=utf-8 "); $array _push = Array (" topic.alibabacloud.com "," www.php.cn "," www.php.cn "," PHP from Beginner to Proficient ");//define Array Array_ Push ($array _push, "Baidu a Bit", "www.php.cn");//add Element Print_r ($array _push); echo "<br>"; $result =array_unique ($array _ push);//delete duplicate elements in the array print_r ($result); Output the deleted array?>

The output is:

The Array_unique () function applies only to one-dimensional arrays, not to multidimensional arrays, but you can use Array_unique () for values in two-dimensional arrays.

The following example is the use of the Array_unique () function to remove the duplicate elements of a two-dimensional array, the specific code is as follows:,

<?php$array = Array (Array (1,1,2), Array (2,3,4,3));p Rint_r ($array), $temp _array = Array (), foreach ($array as $key = > $value) {    $temp _array[$key] = Array_unique ($value);} $array = $temp _array;echo "<br>";p Rint_r ($array);? >

The output is:

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