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@ 2022-09-20T13:07:17Z

<?php

$my_array = array(    
    0 =>  array(  
        "name"   => "john",  
        "id"    =>  4  
    ),  
    1   =>  array(  
        "name" =>  "mark",  
        "id" => 152  
    ), 
    2   =>  array(  
        "name" =>  "Eduard",  
        "id" => 152  
    )
);
$needle = 152;
$keys = [];
foreach ($my_array as $key => ['id' => $id]) {
    if ($needle === $id) {
        $keys[] = $key;
    }
}
var_export($keys);

Output
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References
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var_export: documentation ( source)

preferences:dark modelive preview

53.05 ms | 402 KiB | 5 Q