I am using the PHP filter_validate_int to perform a simple telephone validation. The length should be exactly 10 chars and all should be numeric. However as most of the telephone numbers start with a 0. The filter validate int function return false. Is there anyway to resolve this issue. Here is the code that I have used
if(!filter_var($value, FILTER_VALIDATE_INT) || strlen($value) != 10) return false;
There is nothing you can do to make this validation work. In any case, you should not be using FILTER_VALIDATE_INT because telephone numbers are not integers; they are strings of digits.
If you want to make sure that $tel is a string consisting of exactly 10 digits you can use a regular expression:
if (preg_match('/^\d{10}$/', $tel)) // it's valid
or (perhaps better) some oldschool string functions:
if (strlen($tel) == 10 && ctype_digit($tel)) // it's valid
FILTER_VALIDATE_INT does not allow leading zeroes and it also does not allow values larger than PHP_INT_MAX. is_numeric is much less strict than ctype_digit because it allows signs, decimal point and exponential notation.Use preg_match
$str = '0123456789';
if(preg_match('/^\d{10}$/', $str))
{
echo "valid";
}
else
{
echo "invalid";
}
You can use regex :
if (!preg_match('~^\d{10}$~', $value)) return false;
It's a PHP bug - #43372
Regex are fine, but consume some resources.
This works fine with any integer, including zero and leading zeros
if (filter_var(ltrim($val, '0'), FILTER_VALIDATE_INT) || filter_var($val, FILTER_VALIDATE_INT) === 0) {
echo("Variable is an integer");
} else {
echo("Variable is not an integer");
}
0 is not a valid starting number for an int. 0 is the starting number of octal numbers.
A telephone number is a string, not an int. You have to use a regexp to validate it.
(string)(int)$str to be exactly equal to (string)$str.
['flags'=>FILTER_FLAG_ALLOW_OCTAL] to filter_var as a third parameter, and, if string will be a valid oct - that will work (but if it contains 8 or 9 - will not)
8 or 9) that could be an option to resolve a matter via filter_var (so that's you're not fully correct that oct numbers have nothing to do with this case)Probably you need to check whether the return is false or 0. The filters return the input when the validation is successful, or false when it fails.
Use strict comparison (=== or !==) for the comparison, like $result!==false.
if(filter_var($squid, FILTER_VALIDATE_INT)!==false ) {
//if it's here, it passed validation
}
You could also use the is_numeric function: http://php.net/manual/en/function.is-numeric.php
filter_validate_intfunction. Can you show us the code of that function.