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  1. <?php
  2.  
  3. $myArray = [
  4.   ['email' => 'email1@email.com', 'value' => 'aaa'],
  5.   ['email' => 'email1@email.com', 'value' => 'bbb'],
  6.   ['email' => 'email1@email.com', 'value' => 'ccc'],
  7.   ['email' => 'email2@email2.com', 'value' => 'ddd'],
  8.   ['email' => 'email2@email2.com', 'value' => 'eee']
  9. ];
  10.  
  11. foreach ($myArray as $item) {
  12. 	$newArray[$item['email']][] = $item['value'];
  13. }
  14.  
  15. var_dump($newArray);
Success #stdin #stdout 0.02s 24400KB
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stdin
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array(2) {
  ["email1@email.com"]=>
  array(3) {
    [0]=>
    string(3) "aaa"
    [1]=>
    string(3) "bbb"
    [2]=>
    string(3) "ccc"
  }
  ["email2@email2.com"]=>
  array(2) {
    [0]=>
    string(3) "ddd"
    [1]=>
    string(3) "eee"
  }
}
https://ideone.com/v4WE0g
language:
PHP (php 7.3.5)
created:
8 years ago
visibility:
secret

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