string min,max length function - php

Question

I'm trying to check min and max length of strings:
If I pass it an array, such as follows, I want the values to be returned if true and NULL if false:
$lenghts = array('a' => array('min' => 20, 'max' => 70),
'b' => array('min' => 50, 'max' => 800),
'c' => array('min' => 3, 'max' =>8));
And the values are:
$values = array('thread_title' => 'this is it', 'thread_content' => 'this is not it', 'thread_tags' => 'also not it')
;
EDIT
It's like 5am here (really quite sleepy), I should copied and pasted the correct version, sorry:
function string_min_max($string_array, $array)
{
$returns = array(); # store returned values
foreach ($array as $key)
{
# check for minimum:
if (array_key_exists('min', $key))
{
$minimum = (strlen($string_array[$key]) < $key['min'] ? $key = NULL : $key);
}
if (array_key_exists('max', $key))
{
$maximum = (strlen($string_array($key)) > $key['max'] ? $key = NULL : $key);
}
if ($minimum !== NULL && $maximum !== NULL)
{
$returns[$key]['min'] = $minimum;
$returns[$key]['max'] = $maximum;
}
}
}
This does not work:
string_min_max($values, $lengths);

Answer 1

This code is reducable to:
function string_min_max($array)
{
$returns = array(); # store returned values
foreach ($array as $key)
{
# check for minimum:
if (TRUE)
{
$minimum = (FALSE ? $key = NULL : $key);
}
}
}
OR:
function string_min_max($array)
{
$returns = array(); # store returned values
foreach ($array as $key)
{
$minimum = $key;
}
}
OR:
function string_min_max($array)
{
$returns = array(); # store returned values
}
OR:
(void)
So the answer is: no. It won't work.

Answer 2

Without looking too much at the details, one obvious problem is that you are not returning anyting from your function; you are building an array but you don´t use it so it gets destroyed at the moment your function ends.
I think that at least you will need this at the end of your function:
return $returns;
} // end function
You can then call your function like:
$results = string_min_max($values, $lenghts);

Answer 3

if use this for validate string by length and chars :
function checkString($string, $regex, $minlenght = 3, $maxlenght = 20) {
if(preg_match($regex, $string) && strlen($string) >= $minlenght && strlen($string) <= $maxlenght) return true;
return false;
}