CODEWITHSUNDEEP
phparrays
user13286
user13286

Reputation: 3075

PHP - Check if value exists in array but only for specific key

I have an array and I am checking if a value exists in the array using in_array(). However, I want to check only in the ID key and not date.

$arr = ({
    "ID":"10",
    "date":"04\/22\/20"
},
{
    "ID":"20",
    "date":"05\/25\/20"
},
{
    "ID":"32",
    "date":"07\/13\/20"
});

So in this example, the condition should not be met since 25 exists in date, but not in ID.

if (in_array("25", $arr)) {
    return true;
}

Upvotes: 0

Views: 1692

Answers (3)

Ankit Jindal
Ankit Jindal

Reputation: 4030

For versions of PHP (>= 5.5.0), there is a simple way to do this

$arr = ({
    "ID":"10",
    "date":"04\/22\/20"
},
{
    "ID":"20",
    "date":"05\/25\/20"
},
{
    "ID":"32",
    "date":"07\/13\/20"
});

$searched_value = array_search('25', array_column($arr, 'ID'));

Here is documentation for array_column.

Upvotes: 1

Alice Ryhl
Alice Ryhl

Reputation: 4229

To directly do this, you need to loop over the array.

function hasId($arr, $id) {
    foreach ($arr as $value) {
        if ($value['ID'] == $id) return true;
    }
    return false;
}

If you need to do this for several IDs, it is better to convert the array to a map and use isset.

$map = array();
foreach ($arr as $value) {
    $map[$value['ID']] = $value;
    // or $map[$value['ID']] = $value['date'];
}

if (isset($map["25"])) {
    ...
}

This will also allow you to look up any value in the map cheaply by id using $map[$key].

Upvotes: 1

Jumshud
Jumshud

Reputation: 1425

You can also check it by array_filter function:

$searchId = '25';
$arr = [[
    "ID" => "10",
    "date" => "04\/22\/20"
],
[
    "ID" => "25",
    "date" => "05\/25\/20"
],
[
    "ID" => "32",
    "date" => "07\/13\/20"
]];

$items = array_filter($arr, function ($item) use ($searchId) { 
    return $item['ID'] === $searchId;
});

if (count($items) > 0) {
   echo 'found';
};

Upvotes: 0

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