


Methods for deduplication in two different situations in PHP two-dimensional arrays
PHP two-dimensional array deduplication can be divided into two situations. One is that the values in the one-dimensional array inside the two-dimensional array cannot be exactly the same and duplicate items are deleted. The other is the one-dimensional array inside the two-dimensional array. Since a certain key value in the array cannot be the same, duplicate items are deleted.
For the following two-dimensional array, it is required to deduplicate it:
$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, ), );
1. The values in the one-dimensional array inside the two-dimensional array cannot be exactly the same. Delete the duplicate items:
The code is as follows:
<?php $arr = array( '0'=>array( 'name'=>'james', 'age'=>30, ), '1'=>array( 'name'=>'susu', 'age'=>26, ), '2'=>array( 'name'=>'james', 'age'=>30, ), 'new'=>array( 'name'=>'kube', 'age'=>37, ), 'list'=>array( 'name'=>'kube', 'age'=>27, ), ); printf("Before tranform the array:<br>"); //输出原来的数组 print_r($arr); echo "<br/>"; function more_array_unique($arr=array()){ foreach($arr[0] as $k => $v){ $arr_inner_key[]= $k; //先把二维数组中的内层数组的键值记录在在一维数组中 } foreach ($arras $k => $v){ $v =join(",",$v); //降维 用implode()也行 $temp[$k] =$v; //保留原来的键值 $temp[]即为不保留原来键值 } printf("After split the array:<br>"); print_r($temp); //输出拆分后的数组 echo"<br/>"; $temp =array_unique($temp); //去重:去掉重复的字符串 foreach ($tempas $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 } //ksort($arr_after);//排序如需要:ksort对数组进行排序(保留原键值key) ,sort为不保留key值 return$arr_after; } $arr_new = more_array_unique($arr); //调用去重函数 printf("Duplicate removal of the array:<br>"); print_r($arr_new); echo "<br/>"; ?>
Output result:
Before transform the array: //Original array
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 ) )
After split the array: //The array after split
Array ( [0] => james,30 [1] => susu,26 [2] => james,30 [new] =>kube,37 [list] => kube,27 )
Duplicate removal of thearray: //Array after deduplication
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 ) )
2. The one-dimensional array inside the two-dimensional array changes due to a certain key value Cannot be the same, delete duplicates:
/*Deduplication for a certain key value*/
<?php $arr= array(……); //同上的二维数组 functionsecond_array_unique_bykey($arr, $key){ $tmp_arr = array(); foreach($arr as $k => $v) { if(in_array($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]); //销毁一个变量 如果$tmp_arr中已存在相同的值就删除该值 } else { $tmp_arr[$k] = $v[$key]; //将不同的值放在该数组中保存 } } //ksort($arr); //ksort函数对数组进行排序(保留原键值key) sort为不保留key值 return $arr; } $key ='name'; $arr_key = second_array_unique_bykey($arr,$key); printf("As for the givenkey->%s:<br>",$key); print_r($arr_key); echo "<br/>"; ?>
Output result:
As for the given key->name:
Array ( [0] => Array ( [name] => james [age] => 30 ) [1] => Array ([name] => susu [age] => 26 ) [new] => Array ( [name] => kube [age]=> 37 ) )
Related recommendations:
PHP One-dimensional array merging and deduplication methods
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