Read .txt file into a multi dimensional array in php

The example .txt data is:

20|Charlotte Aaaa|XXXX*SALE*O9
60|Peggy Bbbbb|XXXX*SALE*O8
25|Ashley Ccccc|XXXX*SALE*O7
103|Andrew Ddddd|XXXX*SALE*O1
51|Sally EEeee|XXXX*SALE*O6
9|Richard Fffff|XXXX*SALE*O3
23|Charlotte Aaaaaaaa|XXXX*SALE*O10
150|James Ggggggg|XXXX*SALE*O1
101|Connor Hhhhhhh|XXXX*SALE*O2
90|Barbara Iiiiiiii|XXXX*SALE*O2
23|Richard Ffffff|XXXX*DROP*O4
10|Holly Jjjjjjjj|XXXX*SALE*O5
90|Barbara Iiiiiii|XXXX*SALE*10

The code I currently have is:

$handle = fopen("lock.txt", "r");
if ($handle) {
    $i=1;
    while (($line = fgets($handle)) !== false) {
        $data = explode("|", $line);
        $locks = array($i, $data);
        $i++;
        var_dump($locks);

    }
    fclose($handle);
} else {
    // error opening the file.
}

The output is currently:

array(2) { [0]=> int(1) [1]=> array(3) { [0]=> string(2) "20" [1]=> string(14) "Charlotte Aaaa" [2]=> string(14) "XXXX*SALE*O9 " } } array(2) { [0]=> int(2) [1]=> array(3) { [0]=> string(2) "60" [1]=> string(11) "Peggy Bbbbb" [2]=> string(14) "XXXX*SALE*O8 " } } array(2) { [0]=> int(3) [1]=> array(3) { [0]=> string(2) "25" [1]=> string(12) "Ashley Ccccc" [2]=> string(14) "XXXX*SALE*O7 " } } array(2) { [0]=> int(4) [1]=> array(3) { [0]=> string(3) "103" [1]=> string(12) "Andrew Ddddd" [2]=> string(14) "XXXX*SALE*O1 " } } array(2) { [0]=> int(5) [1]=> array(3) { [0]=> string(2) "51" [1]=> string(11) "Sally EEeee" [2]=> string(14) "XXXX*SALE*O6 " } } array(2) { [0]=> int(6) [1]=> array(3) { [0]=> string(1) "9" [1]=> string(13) "Richard Fffff" [2]=> string(14) "XXXX*SALE*O3 " } } array(2) { [0]=> int(7) [1]=> array(3) { [0]=> string(2) "23" [1]=> string(18) "Charlotte Aaaaaaaa" [2]=> string(15) "XXXX*SALE*O10 " } } array(2) { [0]=> int(8) [1]=> array(3) { [0]=> string(3) "150" [1]=> string(13) "James Ggggggg" [2]=> string(14) "XXXX*SALE*O1 " } } array(2) { [0]=> int(9) [1]=> array(3) { [0]=> string(3) "101" [1]=> string(14) "Connor Hhhhhhh" [2]=> string(14) "XXXX*SALE*O2 " } } array(2) { [0]=> int(10) [1]=> array(3) { [0]=> string(2) "90" [1]=> string(16) "Barbara Iiiiiiii" [2]=> string(14) "XXXX*SALE*O2 " } } array(2) { [0]=> int(11) [1]=> array(3) { [0]=> string(2) "23" [1]=> string(14) "Richard Ffffff" [2]=> string(14) "XXXX*DROP*O4 " } } array(2) { [0]=> int(12) [1]=> array(3) { [0]=> string(2) "10" [1]=> string(14) "Holly Jjjjjjjj" [2]=> string(14) "XXXX*SALE*O5 " } } array(2) { [0]=> int(13) [1]=> array(3) { [0]=> string(2) "90" [1]=> string(15) "Barbara Iiiiiii" [2]=> string(12) "XXXX*SALE*10" } } 

What I would like to do is as follows, create an array which I can later use for an ajax search for the third part of each row, i.e. the XXXXSALEYY part so I was thinking $locks[0][3] for which I can later change the 0 as a thing which is used for ajax searching later.

I haven't looked at integrating ajax yet as I am failing at this. Any help would be appreciated.