Question 181111 in PHP Question posted in
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php array: replacing parent key with child key

How in php to replace the key in an array, with the key of a sub-array to get this effect:
from:

`Array
(
    [0] => Array
        (
            [for_a] => me
        )

    [1] => Array
        (
            [for_b] => you
        )

    [2] => Array
        (
            [for_c] => bleeh
        )
)`

to:

`Array
(
    [for_a] => me
    [for_b] => you
    [for_c] => bleeh

)`

I tried with array_column, but it had no effect

Tags:

3

Answers


  1. 0

    You could do it like this:

    This method assumes that there is only one element in each (the hardcoded [0]s in $arr2[array_keys($arr)[0]] = array_values($arr)[0];)

    <?php
//initialize source array
$arr1 = array(
    array("for_a"=>"me"),
    array("for_b"=>"you"),
    array("for_c"=>"bleeh")
);

//initialize output array
$arr2 = array();

//debug printsource array
print_r ($arr1);

foreach($arr1 as $arr){
    $arr2[array_keys($arr)[0]] = array_values($arr)[0];

}
//debug: print output array
print_r ($arr2);

    It is not the most elegant way. There is a method called array_walk where you can define a callback function parsing each element of your array, in which you can make sure you don’t overwrite the existing elements of the array.

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  2. 0

    @Josste gave a good example, and here’s another way you could do it:

    Looping through your array twice, once to grab the parent array and then again for each of the children then use the parent key to update a new array key for the output.

    <?php
$array = [
    [
        'for_a' => 'me'
    ],
    [
        'for_b' => 'you'
    ],
    [
        'for_c' => 'bleeh'
    ]
];

$new = [];
foreach($array as $arr) {
    foreach($arr as $key => $val) {
        $new[key($arr)] = $val;
    }
}

echo "<pre>" . print_r($new, TRUE) . "</pre>";
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  3. 0

    Try this php script:

    <?php

$vetor[] = array("for_a" => "me");
$vetor[] = array("for_b" => "you");
$vetor[] = array("for_c" => "bleeh");

print_r($vetor);

foreach($vetor as $x)
{
    foreach($x as $key=>$value) {
        $vetor2[$key] = $value;
    }
}

print_r($vetor2);
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