PHP two-dimensional array custom function to remove duplicate items_PHP tutorial

If we are removing duplicate items from one-dimensional data, there is no direct function. However, PHP does not provide functions for two-dimensional data. The editor below will recommend two good two-dimensional arrays to remove duplicate items. Define the function.

Example 1

The code is as follows

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function unique_array_2d($array2D,$stkeep=false,$ndformat=true) { // Determine whether to retain the first-level array key (the first-level array key can be non-numeric) If($stkeep) $stArr = array_keys($array2D); // Determine whether to retain the secondary array keys (all secondary array keys must be the same) If($ndformat) $ndArr = array_keys(end($array2D)); //Dimensionality reduction, you can also use implode to convert a one-dimensional array into a string connected with commas foreach ($array2D as $v){                     $v = join(",",$v);                   $temp[] = $v; } //Remove repeated strings, that is, repeated one-dimensional arrays          $temp = array_unique($temp); //Reassemble the disassembled array foreach ($temp as $k => $v)           { If($stkeep) $k = $stArr[$k]; If($ndformat)                                               {                                 $tempArr = explode(",",$v); foreach($tempArr as $ndkey => $ndval) $output[$k][$ndArr[$ndkey]] = $ndval;                 }                          else $output[$k] = explode(",",$v); } return $output; } $array2D = array( 'first'=>array('title'=>'1111','date'=>'2222'), 'second'=>array('title'=>'1111','date'=>'2222'), 'third'=>array('title'=>'2222','date'=>'3333') ); echo " "; print_r(unique_array_2d($array2D,true)); /** * Deduplicate the two-dimensional array through the specified key * * @param array $arr Array to remove duplicates * @param array $by Specify key to remove duplicates. If this parameter is not specified, array() will be returned * @return array */ function array_multunique($arr,$by = array()) {        $temp = array();        foreach($arr as $key => $val) {                foreach($by as $v) {                        $temp[$key] .= isset($val[$v]) ? $val[$v] : '';                }        }        return array_intersect_key($arr,array_unique($temp)); } /*$aa = array (     array ('id' => 123, 'name' => '张三' ),      array ('id' => 123, 'name' => '李四' ),      array ('id' => 124, 'name' => '王五' ),      array ('id' => 125, 'name' => '赵六' ),      array ('id' => 126, 'name' => '赵六' )   );  $key = 'id';  array_multunique ($aa, array('id')); */ function array_remove_key($array,$keys){        if (!is_array($array) || !is_array($keys)){                return false;        }        foreach($array as $t){                foreach($keys as $k){                        unset($t[$k]);                }                $doc[]=$t;        }        return $doc; } /*$array = array(        '0' => array('a' => 'aaaaa', 'b' => 'bbbbb', 'c' => array('d' => 'ddddd', 'e' => 'eeeee')),        '1' => array('a' => 'aaaaa', 'b' => 'bbbbb', 'c' => array('d' => 'ddddd', 'e' => 'eeeee')) ); print_r( array_remove_key($array,array('c')));*/ function array_remove_key_val(&$a,$b,$c){        foreach ($a as $key=>$value){                if ( isset($value[$b]) && ($value[$b]==$c) ){                        unset($a[$key]);                }        } } /*$a=array(        array('id'=>1,'num'=>10,'type'=>'news'),        array('id'=>2,'num'=>100,'type'=>'pic') ); print_r( array_remove_key_val($a,"id","1") );*/

Example 2

The code is as follows

代码如下

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/二维数组去掉重复值 function array_unique_fb($array2D){      foreach ($array2D as $v){          $v = join(",",$v);  //降维,也可以用implode,将一维数组转换为用逗号连接的字符串          $temp[] = $v;      }      $temp = array_unique($temp);    //去掉重复的字符串,也就是重复的一维数组     foreach ($temp as $k => $v){         $temp[$k] = explode(",",$v);   //再将拆开的数组重新组装     }     return $temp; } //二维数组去掉重复值  并保留键值 function array_unique_fb($array2D){     foreach ($array2D as $k=>$v){         $v = join(",",$v);  //降维,也可以用implode,将一维数组转换为用逗号连接的字符串   $temp[$k] = $v;     }  $temp = array_unique($temp);    //去掉重复的字符串,也就是重复的一维数组     foreach ($temp as $k => $v){         $array=explode(",",$v);  //再将拆开的数组重新组装   $temp2[$k]["id"] =$array[0];     $temp2[$k]["litpic"] =$array[1];   $temp2[$k]["title"] =$array[2];   $temp2[$k]["address"] =$array[3];   $temp2[$k]["starttime"] =$array[4];   $temp2[$k]["endtime"] =$array[5];   $temp2[$k]["classid"] =$array[6];   $temp2[$k]["ename"] =$array[7];  }     return $temp2; }

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/Remove duplicate values ​​from two-dimensional array function array_unique_fb($array2D){

foreach ($array2D as $v){

             $v = join(",",$v); //To reduce dimensionality, you can also use implode to convert a one-dimensional array into a string connected with commas            $temp[] = $v; } $temp = array_unique($temp); //Remove repeated strings, that is, repeated one-dimensional arrays foreach ($temp as $k => $v){          $temp[$k] = explode(",",$v); //Reassemble the disassembled array } Return $temp; } //Two-dimensional array removes duplicate values ​​and retains key values function array_unique_fb($array2D){

foreach ($array2D as $k=>$v){            $v = join(",",$v); //Dimensionality reduction, you can also use implode to convert a one-dimensional array into a string connected with commas $temp[$k] = $v;

}

$temp = array_unique($temp); //Remove repeated strings, that is, repeated one-dimensional arrays foreach ($temp as $k => $v){          $array=explode(",",$v); //Reassemble the disassembled array $temp2[$k]["id"] =$array[0]; $temp2[$k]["litpic"] =$array[1]; $temp2[$k]["title"] =$array[2]; $temp2[$k]["address"] =$array[3]; $temp2[$k]["starttime"] =$array[4]; $temp2[$k]["endtime"] =$array[5]; $temp2[$k]["classid"] =$array[6]; $temp2[$k]["ename"] =$array[7]; } Return $temp2; } http://www.bkjia.com/PHPjc/632786.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/632786.htmlTechArticleIf we are removing duplicates from one-dimensional data, there is no direct function, but two-dimensional data php No function is provided. Let me recommend two good two-dimensional arrays to repeat...