CODEWITHSUNDEEP
phparrayskeykey-value
JCHASE11
JCHASE11

Reputation: 3941

Using PHP to extract key from value in an array

I have a PHP array that prints the following information:

Array ( 
    [0] => 23 
    [1] => 34 
    [2] => 35 
    [3] => 36 
    [4] => 37 
    [5] => 38 
    ..<snip>..
)

I have the value and would like to cross reference it with the array to return a key. For instance, if I have a variable $value = 34 I would want to run a PHP function to return the key, which in this case is 1.

To be more specific, the array is stored in variable $pages and the value is stored in variable $nextID. I tried using array_search with no luck:

How do I go about this?

Upvotes: 0

Views: 198

Answers (2)

patryk
patryk

Reputation: 62

You could use foreach() like that:

<?php
$arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4);

function mySearch($array, $search){
    foreach($array as $key => $value){
        if($value == $search){
            return $key;
        }
    }
}

echo mySearch($arr, 3);
?>

Upvotes: 0

Supericy
Supericy

Reputation: 5896

array_search is exactly what you're looking for. I'm not sure how you had problems with it.

$arr = [
    5,
    10,
    15,
    20
];

$value = 15;

echo array_search($value, $arr); // 2

Upvotes: 2

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