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Php check if value exists in multidimensional array

// 1d array
in_array('something', $array);

// 2d array
array_column($multi_array, 'your_column');

/**
0 => ['hi'=>0, 'your_column'=>1, 'hi'=>0, 'your_column'=>3]
will be
[1, 3]
and then you can apply the in_array function on that new array ^
*/

Php check if value exists in multidimensional array

$userdb=Array
(
(0) => Array
    (
        (uid) => '100',
        (name) => 'Sandra Shush',
        (url) => 'urlof100'
    ),

(1) => Array
    (
        (uid) => '5465',
        (name) => 'Stefanie Mcmohn',
        (pic_square) => 'urlof100'
    ),

(2) => Array
    (
        (uid) => '40489',
        (name) => 'Michael',
        (pic_square) => 'urlof40489'
    )
);

$key = array_search(40489, array_column($userdb, 'uid'));

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