Generate array of key value by searching one array in another array

Question

i am trying to building an application in which 2 arrays is there, second array is getting applying rsort to first array.

$array_1 = array('20','30','30','20');
$array_2 = array('30','30','20','20');

i want generate a new array by searching array_1 in array_2 and return key values, ie

$key_array = array('2','0','1','3');

I tried like

$array_1 = array('20','30','30','20');
$array_2 = $array_1;

rsort($array_2);
$first_keys = array();
foreach($array_1 as $key=>$arr1){
    $first_keys[] = array_search($arr1, $array_2);
}
echo "<pre>";
print_r($first_keys);

but its getting 2,0,0,2

I also tried replacing current key by 'xx'.but it also printing 2,0,0,2

foreach($array_1 as $key=>$arr1){
    $array_1[$key] = 'xx';
    $first_keys[] = array_search($arr1, $array_2);
}

on what basis to get this output? I am kind of confuse

jonju
– jonju

2016-08-06 08:34:08 +00:00
Commented Aug 6, 2016 at 8:34 — jonju
– jonju, Commented Aug 6, 2016 at 8:34

technico · Accepted Answer · 2016-08-06 08:34:34Z

2

You need to remove from $array2 the value on each search, while preserving the array references. This should work (can't test here):

$array_1 = array('20','30','30','20');
$array_2 = $array_1;

rsort($array_2);
$first_keys = array();
foreach($array_1 as $key=>$arr1){
     $key= array_search($arr1, $array_2);
     $first_keys[] = $key;
     $array_2[$key]="";
}
echo "<pre>";
print_r($first_keys);

answered Aug 6, 2016 at 8:34

technico

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1 Comment

Jasir alwafaa Over a year ago

Thnks...figure it out

vipin sharma · Accepted Answer · 2016-08-06 10:01:37Z

1

You have to remove searched key from second array.

Unset that key from second array.(working)

$array_1 = array('20','30','30','20');

$array_2 = $array_1;

rsort($array_2);

$first_keys = array();
foreach($array_1 as $key=>$arr1){
    $searchKey = array_search($arr1, $array_2);
    $first_keys[] = $searchKey;
    unset($array_2[$searchKey]);

}
echo "<pre>";
print_r($first_keys);

answered Aug 6, 2016 at 10:01

vipin sharma

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