php - How to find values which were found before inside multi array -


i have following problem. have check if array contains exact same values , if found before.

int(3) wasn´t found before 0, int(8) wasn´t found before 0, int(5) wasn´t found before 0, int(8) found before 1, int(3) , int(8) not found 0, , on.

i tried array_unique didn´t work wanted

for example:

array(7) {   [2] => array(1) {     [0] => int(3)   }   [3] => array(1) {     [0] => int(8)   }   [4] => array(1) {     [0] => int(5)   }   [5] => array(1) {     [0] => int(8)   }   [6] => array(2) {     [0] => int(3)     [1] => int(8)   }   [7] => array(2) {     [0] => int(2)     [1] => int(5)   }   [8] => array(2) {     [0] => int(3)     [1] => int(8)   } }

it must this

array(7) {   [2] => array(1) {     [0] => int(0)   }   [3] => array(1) {     [0] => int(0)   }   [4] => array(1) {     [0] => int(0)   }   [5] => array(1) {     [0] => int(1)   }   [6] => array(1) {     [0] => int(0)   }   [7] => array(1) {     [0] => int(0)   }   [8] => array(1) {     [0] => int(1)   } }

you use array_map() , serialize():

<?php  $data = [     2 => [         3,     ],     3 => [         8,     ],     4 => [         5,     ],     5 => [         8,     ],     6 => [         3,         8,     ],     7 => [         2,         5,     ],     8 => [         3,         8,     ], ];  $occurrences = [];  $mapped = array_map(function (array $values) use (&$occurrences) {     // create serialized representation of values     // can use index      $index = serialize($values);      // haven't seen these values before     if (!array_key_exists($index, $occurrences)) {         $occurrences[$index] = 1;          return 0;     }      // increase our counter     $occurrences[$index]++;      return $occurrences[$index] - 1; }, $data);  var_dump($mapped);

for reference, see:

for example, see:


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