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PHP has two ways to validate phone numbers, one is regular expression regexand the other is filterthe method. We can use to regexset a template and validate the phone number based on that template, but filterwill only exclude the unwanted characters.

This article explains how to validate different phone numbers in PHP.

regexValidating phone numbers using regular expressions in PHP

preg_match()Is a built-in function in PHP that checks whether the data conforms to a given format; it returns a Boolean value.

example:

<?php
function validate_number($phone_number){
if(preg_match('/^[0-9]{11}+$/', $phone_number)) {
    // the format /^[0-9]{11}+$/ will check for phone number with 11 digits and only numbers
    echo "Phone Number is Valid <br>";
}   else{
    echo "Enter Phone Number with correct format <br>";
    }
}
//valid phone number with 11 digits
validate_number("03333333333");
//Invalid phone number with 13 digits
validate_number("0333333333333");
// 11 digits number with invalid charachters.
validate_number("03333333-33");
?>

The above code will only validate a phone number with only 11 digits.

Output:

Phone Number is Valid
Enter Phone Number with correct format
Enter Phone Number with correct format

The next example shows how to validate -a phone number that starts with and contains special characters and a country code.

example:

<?php
function validate_number($phone_number){
if(preg_match('/^[0-9]{4}-[0-9]{7}$/', $phone_number)){
    // the format /^[0-9]{4}-[0-9]{7}$/ will check for phone number with 11 digits with a - after first 4 digits.
    echo "Phone Number is Valid <br>";
}   else{
    echo "Enter Phone Number with correct format <br>";
   }
}
//Valid phone number with 11 digits and a -
validate_number("0333-3333333");
//Invalid phone number with 13 digits and -
validate_number("0333-333333333");
//Invaild  11 digits number with two -.
validate_number("0333-3333-33");
echo "<br>";

function validate_country_number($phone_number){
if(preg_match('/^\+[0-9]{1,2}-[0-9]{3}-[0-9]{7}$/', $phone_number)){
    // the format /^\+[0-9]{1,2}-[0-9]{3}-[0-9]{7}$/ will check for phone number with country codes, 11 or 12 digits, + and -
    echo "Phone Number is Valid with country code <br>";
}   else{
    echo "Enter Phone Number with correct format <br>";
   }
}
//Valid phone number with 12 digits + and -. According to the format given in the function for country code.
validate_country_number("+92-333-3333333");
//Invalid phone number with with country code
validate_country_number("+92-333333333333");
//Invaild  Number without country code.
validate_country_number("03333333333");
?>

Output:

Phone Number is Valid
Enter Phone Number with correct format
Enter Phone Number with correct format

Phone Number is Valid with country code
Enter Phone Number with correct format
Enter Phone Number with correct format

It should be mentioned here that each country has its own format for phone numbers. Any format can be set with preg_matchthe regular expression function to validate phone numbers.

filterValidate phone number in PHP using method

Filters in PHP are used to validate and sanitize data input. The filter also corrects the format and outputs the correct phone number.

example:

<?php
function validate_number($phone_number){
$valid_phone_number = filter_var($phone_number, FILTER_SANITIZE_NUMBER_INT);
echo $valid_phone_number."<br>";
}
//valid phone numbers
validate_number("03333333333");
validate_number("0333-3333333");
validate_number("+92-333-3333333");
//invalid phone numbers
validate_number("03333333&333");
validate_number("0333-33*33333");
validate_number("+92-333-333##3333");
?>

The above code uses the built-in function filter_varand constants FILTER_SANITIZE_NUMBER_INT, and it will check for an integer with the +and -symbols. If it detects any other characters, it will exclude them and return the correct phone number.

Output:

03333333333
0333-3333333
+92-333-3333333
03333333333
0333-3333333
+92-333-3333333

The disadvantage of this method is that we cannot set the length for the phone number, and if +and -are in the wrong position in the number, it will not correct them. When we enter other characters by mistake, we can use the filtering method to exclude them.