How to remove duplicate values ​​from php multidimensional array

How to remove duplicate values ​​from multi-dimensional arrays in php: 1. Use "array_map('serialize', $arr)" to convert the multi-dimensional array into a one-dimensional array in the form of a string; 2. Use array_unique() to remove Duplicate values ​​in the one-dimensional array; 3. Reconvert the deduplicated one-dimensional array into a multi-dimensional array.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php multi-dimensional array removal Duplicate values

1. Implement function to remove duplicate values ​​from multi-dimensional array

function array_unique_new($arr) {
	$t = array_map('serialize', $arr);
	//利用serialize()方法将数组转换为以字符串形式的一维数组
	$t = array_unique($t);
	//去掉重复值
	$new_arr = array_map('unserialize', $t);
	//然后将刚组建的一维数组转回为php值
	return $new_arr;
}

2. Array that needs to remove duplicate values

$arr = array( 
	array('sup_name' => '上海', 'cn_name' => 'EthylAcetate', 'en_name' => '乙酸乙酯1', 'pinyin' => 'yisuanyizhi', 'pro_info' => '耗材', ), 
	array('sup_name' => '上海2', 'cn_name' => 'EthylAcetate', 'en_name' => '乙酸乙酯2', 'pinyin' => 'yisuanyizhi', 'pro_info' => '耗材', ), 
	array('sup_name' => '上海4', 'cn_name' => 'EthylAcetate', 'en_name' => '乙酸乙酯1', 'pinyin' => 'yisuanyizhi', 'pro_info' => '耗材', ), 
	array('sup_name' => '上海', 'cn_name' => 'EthylAcetate', 'en_name' => '乙酸乙酯3', 'pinyin' => 'yisuanyizhi', 'pro_info' => '耗材', ), 
	array('sup_name' => '上海1', 'cn_name' => 'EthylAcetate', 'en_name' => '乙酸乙酯4', 'pinyin' => 'yisuanyizhi', 'pro_info' => '耗材', ), 
	array('sup_name' => '上海', 'cn_name' => 'EthylAcetate', 'en_name' => '乙酸乙酯3', 'pinyin' => 'yisuanyizhi', 'pro_info' => '耗材', ), 
	array('sup_name' => '上海1', 'cn_name' => 'EthylAcetate', 'en_name' => '乙酸乙酯4', 'pinyin' => 'yisuanyizhi', 'pro_info' => '耗材', ), 
);

Look at the output:

3. Execute the test

$new_arr = array_unique_new($arr);

echo &#39;<pre/>&#39;;
print_r($new_arr);

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