How to remove duplicate values ​​in php

php method to remove duplicate values: 1. Use "function more_array_unique($arr=array()){...}" to remove multiple value arrays; 2. Use "$arr_new = more_array_unique($ arr);" method to call the deduplication function; 3. Output the deduplication array.

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

How to remove duplicate values ​​in php?

php removes duplicate values ​​from the array and returns the result!

array_unique(array) can only process arrays with only a single value.

To remove multiple value arrays, you can use the following function:

function more_array_unique($arr=array()){  
    foreach($arr[0] as $k => $v){  
        $arr_inner_key[]= $k;   //先把二维数组中的内层数组的键值记录在在一维数组中  
    }  
    foreach ($arr as $k => $v){  
        $v =join(",",$v);    //降维 用implode()也行  
        $temp[$k] =$v;      //保留原来的键值 $temp[]即为不保留原来键值  
    }  
    $temp =array_unique($temp);    //去重：去掉重复的字符串  
    foreach ($temp as $k => $v){  
        $a = explode(",",$v);   //拆分后的重组 如：Array( [0] => james [1] => 30 )  
        $arr_after[$k]= array_combine($arr_inner_key,$a);  //将原来的键与值重新合并  
    }  
    return $arr_after;  
}

There are the following arrays:

 $arr = array(  
          '0'=>array(  
                   'name'=>'james',  
                   'age'=>30,  
                   ),  
          '1'=>array(  
                   'name'=>'susu',  
                   'age'=>26,  
                   ),  
           '2'=>array(  
                   'name'=>'james',  
                   'age'=>30,  
                   ),  
           'new'=>array(  
                   'name'=>'kube',  
                   'age'=>37,  
                   ),  
           'list'=>array(  
                   'name'=>'kube',  
                   'age'=>27,  
                   ),  
           '435'=>array(  
                   'name'=>'susu',  
                   'age'=>26,  
                   ),
            '33'=>array(  
                   'name'=>'james',  
                   'age'=>30,  
                   ), 
           );

After calling the function, it is displayed:

Array
(
    [0] => Array
        (
            [name] => james
            [age] => 30
        )
    [1] => Array
        (
            [name] => susu
            [age] => 26
        )
    [new] => Array
        (
            [name] => kube
            [age] => 37
        )
    [list] => Array
        (
            [name] => kube
            [age] => 27
        )
)

Test The demo is as follows:

");   //输出原来的数组  
print_r($arr);  
echo "

";   
function more_array_unique($arr=array()){  
    foreach($arr[0] as $k => $v){  
        $arr_inner_key[]= $k;   //先把二维数组中的内层数组的键值记录在在一维数组中  
    }  
    foreach ($arr as $k => $v){  
        $v =join(",",$v);    //降维 用implode()也行  
        $temp[$k] =$v;      //保留原来的键值 $temp[]即为不保留原来键值  
    }  
    $temp =array_unique($temp);    //去重：去掉重复的字符串  
    foreach ($temp as $k => $v){  
        $a = explode(",",$v);   //拆分后的重组 如：Array( [0] => james [1] => 30 )  
        $arr_after[$k]= array_combine($arr_inner_key,$a);  //将原来的键与值重新合并  
    }  
    return $arr_after;  
}  
    $arr_new = more_array_unique($arr);  //调用去重函数  
    printf("去除重复元素后的数组:
");  
    
    echo '
';
    print_r($arr_new);  
    echo "

";  
?>
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