Question

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Check if a “run-time” multidimensional array key exists

Hi,

I have a multidimensional array. I need a function that checks if a specified key exists and if not set the value.

Let’s take this array

$config['lib']['template']['engine'] = false;

A function should not update the value to true when i call with:

checkAndSetKey('lib template engine',true);
//> Checks if isset $config['lib']['template']['engine'] and if not isset $config['lib']['template']['engine'] = true;

Note that my array isn’t only 3 dimensional. It should be able to check and set even with only 1 dimension:

checkAndSetKey('genericSetting',true);
//> In this considering there isn't any $c['genericSetting'] the function set the key to true;

At the moment I am using an awful eval code, I would like to hear suggest 🙂

To dynamically check if the key exists it could be used this code:

$array = $config;
$keys=explode(' ',$argument1);

foreach($keys as $v) { 

    if (!array_key_exists($v,$array)) {
        //> [todo!] the current key doens't exist now we should set the value
    }

    $array = &$array[$v];
}

Answer 1

LOL actually this was just one line of code added there =/
For a moment the references confused me a bit.

Here the code :

function _c($key,$value) {
    global $c;

    $array = &$c;
    $keys = explode(' ',$key);

    $setValue = false;
    for($i=0;$i<count($keys);$i++) { 
        $v = $keys[$i];

        //> If setValue is already = true we don't need to check it again
        if (!$setValue && !array_key_exists($v,$array))
            $setValue = true;

        $array = &$array[$v];
    }

    if ($setValue)
        $array = $value;
}

//> Usage _c('lib template engine',true);