Example of implementing one-dimensional array and two-dimensional array deduplication function in PHP

This article mainly introduces PHP to implement the deduplication function of one-dimensional arrays and two-dimensional arrays, and analyzes related operating techniques such as traversing, judging, sorting, and deduplication of one-dimensional arrays and two-dimensional arrays in PHP based on examples. Friends in need can refer to the following

The example of this article describes the implementation of one-dimensional array and two-dimensional array deduplication function in PHP. Share it with everyone for your reference, the details are as follows:

Removal of duplicates in an array

Duplicates in one-dimensional arrays:

Use## The #array_uniquefunction is sufficient. The usage example is as follows:

The result is as follows:

Array ( [0] = > 1 [1] => 2 [2] => 3 [5] => watermalon )

Duplicates of two-dimensional array:

For two-dimensional arrays, we will discuss two situations. One is to delete duplicates because the value of a certain key name cannot be repeated; the other is to delete duplicates because the internal one-dimensional array cannot be exactly the same. The following is For example:

Because the value of a certain key name cannot be repeated, delete the duplicate items

 $v) { if(in_array($v[$key], $tmp_arr))//搜索$v[$key]是否在$tmp_arr数组中存在，若存在返回true { unset($arr[$k]); } else { $tmp_arr[] = $v[$key]; } } sort($arr); //sort函数对数组进行排序 return $arr; } $aa = array( array('shopId' => 1), array('shopId' => 1), array('shopId' => 2), array('shopId' => 2) ); $key = 'id'; $result = assoc_unique($aa, $key); print_r($result); ?>

The displayed result is:

Array ( [0] => Array ( [shopId] => 1 ) [1] => Array ( [shopId] => 2 ))

PS: There are two relatively simple and practical online text deduplication tools on this site, which are recommended to everyone:

Online Duplicate Removal Tool ：
http://tools.jb51.net/code/quchong

Online text deduplication tool:
http://tools.jb51.net/aideddesign/txt_quchong

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