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@ 2019-10-16T04:31:56Z

<?php

$array = [
    0 => [
        "date" => "01-06-2018", 
        "nav" => "30.65100"], 
    1 => [ 
        "date" => "01-06-2018", 
        "nav" => "30.65100"], 
    2 => [ 
        "date" => "01-06-2018", 
        "nav" => "30.65100"], 
    3 => [ 
        "date" =>"01-06-2018", 
        "nav" => "30.65100"]
        ];
        
array_walk($array, function(&$item1) {
    $item1['id_code'] = "0089";
});

print_r($array);

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_walk: documentation ( source)

preferences:dark modelive previewkey bindings

34.17 ms | 405 KiB | 5 Q