Compare and replace value with another array

Question

I have the following arrays:

$files = ['376840000000367020', '376840000000375036', '376840000000389001'];
$arr   = [];

foreach ($files as $key => $name) {
    $arr[] = $name;
}

$data = [
    '376840000000367020' => '5782',
    '376840000000375036' => '5783',
    '376840000000389001' => '5784',
];

print_r($arr);

This returns:

Array ( [0] => 376840000000367020 [1] => 376840000000375036.... )

I want to compare 2 arrays $arr and $data if the $key is found in $arr replace value with the $data, I'm trying get following output:

Array ( [0] => 5782 [1] => 5783 .... )

I have lots of data to compare so its not ideal to iterate over $arr inside foreach.

How would i go about doing this?

iterate over all entries in $arr, check if the current entry exists within $data if yes replace, otherwise go on — Daniel Christiany
– Daniel Christiany, Commented Jun 21, 2017 at 8:23
$arr should search in $data if there is a match $arr should replace value with $data i'e 5782,5783 etc — sam
– sam, Commented Jun 21, 2017 at 8:34

Mohammad Hamedani · Accepted Answer · 2017-06-21 08:50:25Z

1

You can use array_key_exists function to check a key exists in array:

<?php

$files = ['376840000000367020','376840000000375036','376840000000389001'];

$data = array(
    '376840000000367020'  =>  '5782',
    '376840000000375036'  =>  '5783',
    '376840000000389001'  =>  '5784',
);

$arr = [];
foreach($files as $key=>$name){
    if(array_key_exists($name, $data)) {
        $arr[] = $data[$name];
    }
}


print_r($arr);

answered Jun 21, 2017 at 8:50

Mohammad Hamedani

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Comments

Justinas · Accepted Answer · 2017-06-21 08:26:16Z

0

Iterate $files array and check if value is in $data

foreach ($files as &$file) {
   if (isset($data[$file])) {
       $file = $data[$file];
   }
}

answered Jun 21, 2017 at 8:26

Justinas

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2 Comments

sam Over a year ago

thanks for your help, but it does not give me any output, just blank screen

Justinas Over a year ago

Do you do var_dump($files);?

Community · Accepted Answer · 2020-06-20 09:12:55Z

0

Use array_map passing a callback that checks if the value exist in the 2nd array and return it's value in that case, or the item otherwise.

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered Jun 21, 2017 at 8:27

Robdll

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1 Comment

Robdll Over a year ago

try the given example in the doc. If u have trouble understanding it, explain your doubts and i ll be happy to help

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