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phparrayskeylowercase

Normalize the case of array keys in PHP

Is there a "better" way (built-in function, better algorithm) to normalize the case of all the keys in a PHP array? Looping though and creating a new array works

$new = array();
foreach( $old as $key=>$value) {
    $key = strToLower($key);
    if(!array_key_exists($key,$new) {
        $new[$key] = $value;
    } 
    else {
        throw new Exception('Duplicate Key Encountered');
    }

}

but it seems like these should be a way to do this "in place".

Update: It looks like there is a built in, the not deceptively named yet somehow missed by me array_change_key_case. I'd still be interesting in seeing algorithmic approaches that would let you better handle what happens when you hit "duplicate" keys.

Solution

  • I believe array_change_key_case does what you're looking for.

    https://www.php.net/manual/en/function.array-change-key-case.php