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  1. <?php
  2. //допустим мы искали все сообщения с участием челика с id 4
  3. //база отдала нам вот такой вот массив в итоге
  4.  
  5. $messages = [
  6. 	//id   chatid    text
  7. 	[1,    '1_4',      1231235221],
  8. 	[2,    '1_4',      3453453254],
  9. 	[3,    '3_4',      2435345345], //3_4
  10. 	[4,    '2_4',      2345564426],
  11. 	[5,    '2_4',      3453467854],    //2_4
  12. 	[6,    '4_7',      'posledniy 22'],
  13. 	[7,    '4_7',      2345646456],   //4_7
  14. 	[8,    '1_4',      3453456654],  
  15. 	[9,    '1_4',      2356767567],  //1_4
  16. 	[10,   '4_5',      'last 123'],  //4_5
  17. 	[11,   '4_6',      'toplel 33'], //4_6
  18. ];
  19.  
  20. //4 cтрочки кода перебора массива что бы получить что тебе нужно
  21. $lastMessages = [];
  22. foreach ($messages as $message) {
  23. 	$lastMessages[$message[1]] = $message;
  24. }
  25.  
  26. print_r($lastMessages);
Success #stdin #stdout 0.02s 23420KB
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Array
(
    [1_4] => Array
        (
            [0] => 9
            [1] => 1_4
            [2] => 2356767567
        )

    [3_4] => Array
        (
            [0] => 3
            [1] => 3_4
            [2] => 2435345345
        )

    [2_4] => Array
        (
            [0] => 5
            [1] => 2_4
            [2] => 3453467854
        )

    [4_7] => Array
        (
            [0] => 7
            [1] => 4_7
            [2] => 2345646456
        )

    [4_5] => Array
        (
            [0] => 10
            [1] => 4_5
            [2] => last 123
        )

    [4_6] => Array
        (
            [0] => 11
            [1] => 4_6
            [2] => toplel 33
        )

)
https://ideone.com/PUeu3x
language:
PHP (php 7.3.5)
created:
6 years ago
visibility:
public

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