php validation script for input fields

Validate an integer

// function to validate an integer
function validateInteger($str) {
// test if input is an integer, optionally signed
return preg_match("/^-?([0-9])+$/", $str);
}
// result: "Is an integer"
echo validateInteger("123456") ? "Is an integer" : "Is not an integer";
// result: "Is not an integer"
echo validateInteger("123456.506") ? "Is an integer" : "Is not an integer";
// result: "Is not an integer"
echo validateInteger("12a3456.506") ? "Is an integer" : "Is not an integer";

Validate a float

// function to validate a float
function validateFloat($str) {
// test if input is a floating-point number, optionally signed
return preg_match("/^-?([0-9])+([\.|,]([0-9])*)?$/", $str);
}
// result: "Is a float"
echo validateFloat("123456") ? "Is a float" : "Is not a float";
// result: "Is a float"
echo validateFloat("123456.506") ? "Is a float" : "Is not a float";

Validate a string

function validateString($str) {
// test if input is a string
return is_string($str);
}

Validate only alphabetic characters

function validateAlpha($str) {
// test if input contains only alphabetic characters
return preg_match("/^[a-z]+$/i", $str);
}
// result: "Is alphabetic"
echo validateAlpha("abc") ? "Is alphabetic" : "Is not alphabetic";
// result: "Is not alphabetic"
echo validateAlpha("abc1") ? "Is alphabetic" : "Is not alphabetic";

Validate alphabetic and numeric characters

function validateAlphaNum($str) {
// test if input contains alphabetic and numeric characters
return preg_match("/^[a-z0-9]*$/i", $str);
}
// result: "Is an alphabetic string"
echo validateAlphaNum("abc") ? "Is an alphabetic string" :"Is not an alphabetic string";
// result: "Is an alphabetic string"
echo validateAlphaNum("abc1") ? "Is an alphabetic string" :"Is not an alphabetic string";
// result: "Is not an alphabetic string"
echo validateAlphaNum("abc?") ? "Is an alphabetic string" :"Is not an alphabetic string";

Validate a credit card number

// function to validate a credit card number
function validateCCNum($str) {
// test if input is of the form dddddddddddddddd
return preg_match("/^\d{16}$/" ,$str);
}
// result: "Is a valid 16-digit number"
echo validateCCNum("4476269198125132") ? "Is a valid 16-digit number" :"Is not a 16-digit number";

Validate a credit card expiry date

// function to validate a credit card expiry date
function validateCCExpDate($str) {
// test if input is of the form mm/yyyy
return preg_match("/(0[1-9]|1[0-2])\/20[0-9]{2}$/", $str);
}
// result: "Is a valid date string"
echo validateCCExpDate("12/2013") ? "Is a valid date string" :"Is an invalid date string";

Validate an Indian phone number

// function to validate an Indian phone number
function validateIndiaPhone($str) {
// test if input is of the form (0aa) nnnn nnnn
return preg_match("/^\(0\d{2}\)\s?\d{8}$/", $str);
}
// result: "Is a properly-formatted phone number"
echo validateIndiaPhone("(022) 22881111") ? "Is a properly-formatted phone number" : "Is an improperly-formatted phone number";

Validate US phone number

// function to validate a US phone number
function validateUSPhone($str) {
// test if input is of the form aaa-nnn-nnnn
return preg_match("/^[2-9]\d{2}-\d{3}-\d{4}$/", $str);
}
// result: "Is a properly-formatted phone number"
echo validateUSPhone("301-111-1111") ? "Is a properly-formatted phone number" : "Is an improperly-formatted phone number";

Validate international phone number

// function to validate an international phone number
function validateIntlPhone($str) {
// test if input is of the form +cc aa nnnn nnnn
return preg_match("/^(\+|00)[1-9]{1,3}(\.|\s|-)?([0-9]{1,5}(\.|\s|-)?){1,3}$/", $str);
}
// result: "Is a properly-formatted phone number"
echo validateIntlPhone("+1 301 111 1111") ? "Is a properly-formatted phone number" : "Is an improperly-formatted phone number";
// result: "Is a properly-formatted phone number"
echo validateIntlPhone("0091-11-2123-7574") ? "Is a properly-formatted phone number" : "Is an improperly-formatted phone number";
// result: "Is a properly-formatted phone number"
echo validateIntlPhone("+612 9555-5555") ? "Is a properly-formatted phone number" : "Is an improperly-formatted phone number";
// result: "Is an improperly-formatted phone number"
echo validateIntlPhone("12346") ? "Is a properly-formatted phone number" : "Is an improperly-formatted phone number";

Validate U.S. Social Security number

// function to validate U.S. Social Security number
function validateSSN($str) {
// test if input is of the form ddd-dd-dddd
return preg_match("/^\d{3}\-\d{2}\-\d{4}$/", $str);
}
// result: "Is a properly-formatted SSN"
echo validateSSN("123-45-6789") ? "Is a properly-formatted SSN" :"Is an improperly-formatted SSN";
// result: "Is an improperly-formatted SSN"
echo validateSSN("123456789") ? "Is a properly-formatted SSN" :"Is an improperly-formatted SSN";

Validate a zip code

// function to validate a zip code
function validateZip($str) {
// test if input is of the form dddddd
return preg_match("/^\d{6}$/" ,$str);
}
// result: "Is a properly-formatted zip code"
echo validateZip("123456") ? "Is a properly-formatted zip code" :"Is an improperly-formatted zip code";

Validate UK zip code

// function to validate a UK zip code
function validateUKZip($str) {
// test if input is of the form ssdd dss
return eregi("^[a-z]{1,2}[0-9]{1,2}([a-z])?[[:space:]]?[0-9][a-z]{2}$" ,$str);
}
// result: "Is a properly-formatted UK postcode"
echo validateUKZip("NW3 5ED") ? "Is a properly-formatted UK postcode" :"Is an improperly-formatted UK postcode";

Validate a US zip code

// function to validate a US zip code
function validateUSZip($str) {
// test if input is of the form dddd-ddddd
return preg_match("/^\d{5}(-\d{4})?$/" ,$str);
}
// result: "Is a properly-formatted US zip code"
echo validateUSZip("10113-1243") ? "Is a properly-formatted US zip code" : "Is an improperly-formatted US zip code";

Validate an e-mail address

// function to validate an e-mail address
function validateEmailAddress($str) {
// test if input matches e-mail pattern
return eregi("^([a-z0-9_-])+([\.a-z0-9_-])*@([a-z0-9-])+.(\.[a-z0-9-]+)*\.([a-z]{2,6})$", $str);
}
// result: "Is a properly-formatted e-mail address"
echo validateEmailAddress("joe@some.domain.com") ? "Is a properly-formatted e-mail address" : "Is an improperly-formatted e-mail address";
// result: "Is an improperly-formatted e-mail address"
echo validateEmailAddress("joe@dom.") ? "Is a properly-formatted e-mail address" : "Is an improperly-formatted e-mail address";

Validate a URL

// function to validate a URL
function validateUrl($str) {
// test if input matches URL pattern
return preg_match("/^(http|https|ftp):\/\/([a-z0-9]([a-z0-9_-]*.[a-z0-9])?\.)+[a-z]{2,6}\/?([a-z0-9\?\._-~&#=+%]*)?/", $str);
}
// result: "Is valid"
echo validateUrl("http://www.example.com/html/index.php") ? "Is valid" : "Is invalid";
// result: "Is valid"
echo validateUrl("http://www.some.site.info") ? "Is valid" : "Is invalid";
// result: "Is invalid"
echo validateUrl("http://some") ? "Is valid" : "Is invalid";

Validate an IP address

// function to validate an IP address
function validateIP($str) { 
	if(!filter_var($ip, FILTER_VALIDATE_IP))
	{
		return false;
	}
	else
	{
		return true;
	}
}
// result: "Is valid"
echo validateIP("192.168.0.1") ? "Is valid" : "Is invalid"; 
//result: "Is Invalid" 
echo validateIP("192.168") ? "Is valid" : "Is invalid";

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