Array and Associative Array Merge

Question

How can I achieve the third array, merging Array1 and Array2? What's the best way to do that in PHP? Many thanks. Array2 has like index (key), the associative value of id in Array1.

Array1

Array
(
    [0] => Array
    (
        [id] => 56
        [grade] => 6.7
    )
    [1] => Array
    (
        [id] => 214
        [grade] => 3.2
    )
)

Array2

Array
(
    [56] => 2.4
    [214] => 5.8 
)

Result wanted

Array
(
    [0] => Array
    (
        [id] => 56
        [grade] => 2.4
    )
    [1] => Array
    (
        [id] => 214
        [grade] => 5.8
    )
)

Have you tried anything? One way would be to loop over Array1, check if the id value is a key/set in Array2, and if so replace the grade value — Sean
– Sean, Commented Nov 16, 2015 at 18:09

Roël Gonzalez · Accepted Answer · 2015-11-16 18:34:58Z

1

foreach($array1 as &$arrayItem) {
$arrayItem['grade'] = $array2[$arrayItem['id']]
}

Here you will have array 1 merged as you wished

answered Nov 16, 2015 at 18:34

Roël Gonzalez

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3 Comments

Sean Over a year ago

note this will produce Undefined Error notices and set the value of $arrayItem['grade'] to NULL if $array2[$arrayItem['id']] is not set.

Roël Gonzalez Over a year ago

That is correct, so there would have to come isset checks.

mickmackusa Apr 8 at 22:15

"Symmetric Array Destructuring" version: 3v4l.org/TPV1s

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