modified code originally posted by Ghanshyam Katriya(anshkatriya at gmail) [highest voted comment here].
1. In php 7.4 counter $i breaks the function. Removed completely (imo was waste of keystrokes anyway).
2. I added second return value - array of duplicates. So you can take both and compare them (I had to).
Example array (copy-paste from original post):
<?php
$details = array(
0 => array("id"=>"1", "name"=>"Mike", "num"=>"9876543210"),
1 => array("id"=>"2", "name"=>"Carissa", "num"=>"08548596258"),
2 => array("id"=>"1", "name"=>"Mathew", "num"=>"784581254"),
);
?>
Function:
<?php
function unique_multidim_array($array, $key) : array {
$uniq_array = array();
$dup_array = array();
$key_array = array();
foreach($array as $val) {
if (!in_array($val[$key], $key_array)) {
$key_array[] = $val[$key];
$uniq_array[] = $val;
} else {
$dup_array[] = $val;
}
}
return array($uniq_array, $dup_array, );
}
?>
Usage:
<?php
list($unique_addresses, $duplicates, ) = unique_multidim_array($details,'id');
?>
Then:
var_dump($unique_addresses);
or
var_dump($duplicates);
or foreach or whatever. Personally I just echo-ed 1st and then 2nd (both DOUBLE COMMENTED) list in function itself (then copied both to notepad++ and compared them - just to be 100% sure), but in case you want to do something else with it - enjoy :)
Plus - as a bonus - you also get an array of UNIQUE keys you searched for (just uncomment >$key_array< in both: function return and function call code).
From example array code returns:
var_dump($unique_addresses);
array(2) {
[0]=>
array(3) {
["id"]=>
string(1) "1"
["name"]=>
string(4) "Mike"
["num"]=>
string(10) "9876543210"
}
[1]=>
array(3) {
["id"]=>
string(1) "2"
["name"]=>
string(7) "Carissa"
["num"]=>
string(11) "08548596258"
}
}
var_dump($duplicates);
array(1) {
[0]=>
array(3) {
["id"]=>
string(1) "1"
["name"]=>
string(6) "Mathew"
["num"]=>
string(9) "784581254"
}
}
Plus keys, if you want.
P.S.: in my - practical - case of DB querying I got around 4k uniques and 15k dupes :)
