5

I want to replace all index keys in a array but i need to do it only with a function like array_map (not with a foreach) and that's why it's a little hard for me.

Actual array :

$array = [
    'mc_gross' => 10.17,
    'protection_eligibility' => 'Eligible',
    'address_status' => 'unconfirmed',
    'payer_id' => 'STTAC7UV2CVJ4'
];

Expected array :

$array = [
    'McGross' => 10.17,
    'ProtectionEligibility' => 'Eligible',
    'AddressStatus' => 'unconfirmed',
    'PayerId' => 'STTAC7UV2CVJ4'
];

I have already a function to put the first letter in uppercase and remove all '_' :

str_replace(
    "_",
    "",
    implode(
        '_',
        array_map(
            'ucfirst',
            explode(
                '_',
                ucwords(strtolower($key))
            )
        )
    )
);

I have tried with array_walk, but this function can't replace index key, only value... :

array_walk($array, function ($value, &$key) {
    $key = str_replace("_", "", implode('_', array_map('ucfirst', explode('_', ucwords(strtolower($key))))));
});

Thanks in advance for your help.

ZoRo
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    possible duplicate of [PHP Change Array Keys](http://stackoverflow.com/questions/308703/php-change-array-keys) – slapyo Nov 19 '14 at 23:58
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    Is there a particular reason you don't want to use foreach to solve this? – DaOgre Nov 20 '14 at 00:03
  • @DaOgre Not really, i just want to use an alternative to the foreach function. – ZoRo Nov 20 '14 at 00:11
  • ^ I agree with DaOgre. `foreach`-es are simple, readable, maintainable, and probably just as fast or faster for this as anything you can come up with. But you, you could use `array_combine(array_map($yourfunc,array_keys($array)),$array);` – Wrikken Nov 20 '14 at 00:13
  • I agree with DaOgre too.why you want hard way where you can do it simple way. – Shaiful Islam Nov 20 '14 at 00:17

1 Answers1

10

If you don't want to use a foreach, you can use a combination of array_keys, array_map, and array_combine to achieve this.

$array = array(
    'mc_gross' => 10.17,
    'protection_eligibility' => 'Eligible',
    'address_status' => 'unconfirmed',
    'payer_id' => 'STTAC7UV2CVJ4'
);

//Get keys
$keys = array_keys($array);

//Format keys
function map($key){
    return str_replace(' ', '', ucwords(str_replace('_', ' ', $key)));
}

//Map keys to format function
$keys = array_map('map', $keys);

//Use array_combine to map formatted keys to array values
$array = array_combine($keys,$array);

var_dump($array);

This should output something like:

array(4){
    ["McGross"]=>float(10.17)
    ["ProtectionEligibility"]=>string(8) "Eligible"
    ["AddressStatus"]=>string(11) "unconfirmed"
    ["PayerId"]=>string(13) "STTAC7UV2CVJ4"
}

Relative docs:

http://php.net/manual/en/function.array-keys.php

http://php.net/manual/en/function.array-map.php

http://php.net/manual/en/function.array-combine.php

EDIT

As @Wrikken pointed out, the use of array_values is redundant and not needed. Thanks for the pointer!

M Sost
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    Ha, thought the same thing (though I favor a `foreach`). Quick note: `array_values` is not needed. – Wrikken Nov 20 '14 at 00:15
  • Awesome ! Thanks a lot. I have rewritten your code in one line : `$array = array_combine(array_map(function ($key){ return str_replace("_", "", implode('_', array_map('ucfirst', explode('_', ucwords(strtolower($key)))))); }, array_keys($array)), array_values($array));` – ZoRo Nov 20 '14 at 00:22
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    If that's more readable to you, more power to you ;) Glad I could help – M Sost Nov 20 '14 at 00:23
  • haha Yeah i know that's not readable but i don't need to understand it, because i need to parse a big array from Paypal and after i do an extract() on it. ^^ – ZoRo Nov 20 '14 at 00:30