php match number for first 2 digits and length

Question

I would need to check in php if the number has 10 digit length and the first 2 digits need to be 09 and check for no space too please?

sample true number = 0912345678

Thanks Ramin

Answer 1

You can do that by using regular expressions, like this:

function checkNumber($number) {
    return !!preg_match('/^09\d{8}$/', "$number");
}

Or with simple string matching:

function checkNumber($number) {
    $number = trim("$number");
    if (strlen($number) != 10)
        return false;

    if (substr($number, 0, 2) != "09")
        return false;

    return trim($number, "0..9") == "";
}

Both methods gives same output:

var_dump([$number = '0912345678', checkNumber($number)]);
var_dump([$number = '9012345678', checkNumber($number)]);
var_dump([$number = '091234567', checkNumber($number)]);
var_dump([$number = '09123456788', checkNumber($number)]);

// array(2) {
//   [0]=>
//   string(10) "0912345678"
//   [1]=>
//   bool(true)
// }
// array(2) {
//   [0]=>
//   string(10) "9012345678"
//   [1]=>
//   bool(false)
// }
// array(2) {
//   [0]=>
//   string(9) "091234567"
//   [1]=>
//   bool(false)
// }
// array(2) {
//   [0]=>
//   string(11) "09123456788"
//   [1]=>
//   bool(false)
// }

Also, regexp approach is more simpler and flexible, imho.