Search array keys and return the index of matched key

Question

my array looks like this:

[sx1] => Array
        (
            [sx1] => Pain in Hand
            [sx1L] => Location
            [sx1O] => Other T         


        

Answer 1

If you don't want to use any functions and need to loop through the array anyway to search or match on a specific condition (especially usefully if your searches become more complicated), then you could use the below principle to go through the array and find the index of $mykey and put it into a variable $myindex. This code assume your index starts at zero, if you want to start at 1, then initialize $index = 1;.

$a = array(
    "one" => 1,
    "two" => 2,
    "three" => 3,
    "seventeen" => 17
);

$index = 0;
foreach ($a as $k => $v) {
    if ($k == $mykey) {
            $myindex=$index
    }
    $index=$index+1;
}