Question

How to check if a key exists in multi dimensional array with PHP

Answer 1

$users = [
    [
        "id" => '1234567',
        "fname" => 'Tim',
    ],
    [
        "id" => '9876563',
        "fname" => 'Tom',
    ],
    [
        "id" => '3805732',
        "fname" => 'Mr. T',
    ],
    [
        "id" => '4563524',
        "fname" => 'John',
    ]
];
 
$key = array_search(4563524, array_column($users, 'id'));
 
echo $key; 
 
 
  
/*
run: 
 
3
   
*/  

 

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Answer 2

$users = [
    [
        "id" => '1234567',
        "fname" => 'Tim',
    ],
    [
        "id" => '9876563',
        "fname" => 'Ben',
    ],
    [
        "id" => '3805732',
        "fname" => 'Selena',
    ],
    [
        "id" => '4563524',
        "fname" => 'Fei',
    ]
];
 
$ids = array_column($users, 'id', 'id'); 
if (isset($ids[4563524]))
    echo "key exist"; 
 
 
  
/*
run: 
 
key exist
   
*/ 

 

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