I got an empty array when I compare two arrays that have the different key but the same value. Example: id has the same value like yy
$o = array('id'=>2,'name'=>'D','yy'=>12);
$n = array('id'=>12,'name'=>'D','yy'=>12);
What I want is :
$a = array('id'=>12,'id'=>2);
You can use array_merge_recursive() - (PHP 4 >= 4.0.1, PHP 5, PHP 7)
From PHP Manual:
array_merge_recursive — Merge two or more arrays recursively
<?php
$a = array('id'=>2,'name'=>'D','yy'=>12);
$b = array('id'=>12,'name'=>'D','yy'=>12);
$result = array_merge_recursive($a, $b);
$newArr = $result['id']; // get ID index. you can also get other indexes.
echo "<pre>";
print_r($newArr);
?>
Result:
Array
(
[0] => 2
[1] => 12
)
Note that: you can not use same index name (ID) for this array array('id'=>12,'id'=>2);
As @Ghost mentioned, an associative array should not have the same keys.
I suggest to achieve the "expected result" in "nested arrays" manner using array_diff_assoc function(computes the difference of arrays with additional index check):
$o = array('id'=>2,'name'=>'D','yy'=>12);
$n = array('id'=>12,'name'=>'D','yy'=>12);
echo "<pre>";
$result_nested_arr = [array_diff_assoc($o, $n), array_diff_assoc($n, $o)];
var_dump($result_nested_arr);
// the output:
array(2) {
[0]=>
array(1) {
["id"]=>
int(2)
}
[1]=>
array(1) {
["id"]=>
int(12)
}
}
idvalues on those array, you can't have the same keys in the same array though