php recursive merge

问题:

I need to merge some arrays in some different way and I use array_merge_recursive. However there is something that I need to change and I don't know how. Here is quote from php.net

If, however, the arrays have the same numeric key, the later value will not overwrite the original value, but will be appended.

I want this value, NOT to be appended, I want not to append exact values in the new array.Hope you've understood this.

Example:

$array = array(    'some'  => array(        'other'    => 'key',    ), );  $array2 = array(); $array2['some']['other'] = 'key2'; 

If I use array_merge_recursive It will result this:

Array (     [some] => Array         (             [other] => Array                 (                     [0] => key                     [1] => key2                 )         ) ) 

I want if it matches the same result, not to append it.Yes I know, you would say, then use array_merge, but it doesn't work well, too. If I use this:

$array = array(    'some'  => array(        'other'    => 'key',    ), );  $array2 = array(); $array2['some']['other2'] = 'key2';  print_r(array_merge($array, $array2)); 

It will remove $array[some][other] from the list and leave only $array[some][other2].I don't know which is better, since no one makes it better.

回答1:

try this

<?php function mymerge(&$a,$b){ //$a will be result. $a will be edited. It's to avoid a lot of copying in recursion     foreach($b as $child=>$value){         if(isset($a[$child])){              if(is_array($a[$child]) && is_array($value)){ //merge if they are both arrays                 mymerge($a[$child],$value);             }             //else ignore, you can add your own logic, i.e when 1 of them is array         }         else             $a[$child]=$value; //add if not exists     }      //return $a; } 

回答2:

I wrote my merge class for it:

<?php  class ArrayMerge {      /**      * @param array $a      * @param array $b      *      * @return array      */     public function merge ( $a, $b ) {         foreach ( $b as $k => $v ) {             if ( is_array( $v ) ) {                 if ( isset( $a[ $k ] ) ) {                     if ( $this->isDeep( $v ) ) {                         $a[ $k ] = $this->merge( $a[ $k ], $v );                     } else {                         $a[ $k ] = array_merge( $a[ $k ], $v );                     }                 } else {                     $a[ $k ] = $v;                 }             } else {                 $a[ $k ] = $v;             }         }         return $a;     }      /**      * @param array $array      *      * @return bool      */     private function isDeep ( $array ) {         foreach ( $array as $elm ) {             if ( is_array( $elm ) ) {                 return TRUE;             }         }         return FALSE;     }  } 

回答3:

I started from RiaD's version and added object handling. Need testing and feedback

function recursiveMerge(&$a,$b){ //$a will be result. $a will be edited. It's to avoid a lot of copying in recursion         if(is_array($b) || is_object($b)){             foreach($b as $child=>$value){                 if(is_array($a)){                     if(isset($a[$child]))                         recursiveMerge($a[$child],$value);                     else                         $a[$child]=$value;                 }                 elseif(is_object($a)){                     if(isset($a->{$child}))                         recursiveMerge($a->{$child},$value);                     else                         $a->{$child}=$value;                 }             }         }         else             $a=$b;     } 

回答4:

An other alternative, the array_merge_deep from drupal:

function array_merge_deep($arrays) {   $result = array();   foreach ($arrays as $array) {     foreach ($array as $key => $value) {       // Renumber integer keys as array_merge_recursive() does. Note that PHP       // automatically converts array keys that are integer strings (e.g., '1')       // to integers.       if (is_integer($key)) {         $result[] = $value;       }       // Recurse when both values are arrays.       elseif (isset($result[$key]) && is_array($result[$key]) && is_array($value)) {         $result[$key] = array_merge_deep(array($result[$key], $value));       }       // Otherwise, use the latter value, overriding any previous value.       else {         $result[$key] = $value;       }     }   }   return $result; } 

回答5:

For PHP >= 5.3 just use array_replace_recursive

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