php - Sorting Multidimensional array of more than one level -


i checked other question regarding sort multidimensional array none of them worked in case array following , want sort on based of id value in descending order

$arr = array( 49 => array(     'id' => 65,     'name' => 'any',     'users' => array(         772 => array(             'id' => 149,             'name' => 'any1'         ),         771 => array(             'id' => 779,             'name' => 'any2'         ),         45 => array(             'id' => 259,             'name' => 'any3'         )        ) ), 789 => array(     'id' => 892,     'name' => 'any4',     'users' => array(         65 => array(             'id' => 389,             'name' => 'any5'          ),         98 => array(             'id' => 895,             'name' => 'any6'             ),         99 => array(             'id' => 899,             'name' => 'any7'         )      ) )

);

i tried sort using usort function

usort($arr, function($a, $b) { return $b['id'] - $a['id'];

});

but requirement sort parent child array sort parents

since rules sorting same both parents , children defined compare function. need loop on each parent , sort children.

//compare function, sorts id in desc order function cmp($a, $b){     return $b['id'] - $a['id']; }  //loop on each parent reference changes value in parent array     foreach($arr &$parent){     //sort children     uasort($parent['users'], 'cmp'); } //unset parent array don't overwrite last parent later unset($parent);  //sort parents uasort($arr, 'cmp');

demo: http://codepad.viper-7.com/hqm122

edit: added requirement of preserving keys. switched usort uasort.


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