Question

I have an array like

Array
(
    [select_value_2_1] =>  7
)

I want to explode index into Array ([0]=select_value, [1]=2, [2]=1)

Answer 1

You can’t just use explode() because it will also separate select from value. You could alter your output so that instead you have array keys like selectValue_2_1.

Then you can do what you want:

$items = array('selectValue_2_1' => 1);

foreach ($items as $key => $value) {
    $parts = explode('_', $key);
}

That will yield, for example:

array('selectValue', '2', '1');

You can use array_keys() to extract the keys from an array.