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Useful PHP validation functions

Nov 04, 2013, by admin

Hi all hope you all are well today the topic we going to see in the post is some Useful PHP validation functions hope the post will be useful

String Validation
Validate name, surname by the below function to restrict only letters and spaces.

function validateString($str)
{
//accept letters and space only
return preg_match('/^[A-Za-zs ]+$/', $str);
}

Validate numeric value by the below function to restrict only numbers,you can uncomment any line according to your need.

function validateNumber($value)
{
//is_double($value);
//is_float($value);
//is_int($value);
//is_integer($value);
return is_numeric($value);
}

Alphanumeric Characters Validation
Below function validates alphanumeric characters.ctype is complete function library in PHP.

function validateAlphanumeric($string)
{
return ctype_alnum ($string);
}

Validation for URL Exist or not
This function will check whether a given URL exist and not only validate it.

function urlExist($url)
{
$url = @parse_url($url);
if (!$url){
return false;
}
$url = array_map('trim', $url);
$url['port'] = (!isset($url['port'])) ? 80 : (int)$url['port'];
$path = (isset($url['path'])) ? $url['path'] : '';
if ($path == ''){
$path = '/';
}
$path .= (isset($url['query'])) ? '?$url[query]' : '';
if (isset($url['host']) AND $url['host'] != @gethostbyname($url['host']))
{
if (PHP_VERSION >= 5){
$headers = @get_headers('$url[scheme]://$url[host]:$url[port]$path');
}else{
$fp = fsockopen($url['host'], $url['port'], $errno, $errstr, 30);
if (!$fp){
return false;
}
fputs($fp, 'HEAD $path HTTP/1.1rnHost: $url[host]rnrn');
$headers = fread($fp, 4096);
fclose($fp);
}
$headers = (is_array($headers)) ? implode('n', $headers) : $headers;
return (bool)preg_match('#^HTTP/.*s+[(200|301|302)]+s#i', $headers);
}
return false;
}

Validation for check Image Exist
Below function will check whether a given image link exist and not.

function imageExist($url) {
if(@file_get_contents($url,0,NULL,0,1)){return 1;}else{ return 0;}
}

IP Address Validation
function will validate an IP address.

function validateIP($IP){
return preg_match('/^(([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]).){3}([1-9]?[0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])$/',$IP)
}

Validation for Proxy
This function will detect proxy visitors even those that are behind anonymous proxy :)

function validateProxy(){
if ($_SERVER['HTTP_X_FORWARDED_FOR']
|| $_SERVER['HTTP_X_FORWARDED']
|| $_SERVER['HTTP_FORWARDED_FOR']
|| $_SERVER['HTTP_VIA']
|| in_array($_SERVER['REMOTE_PORT'], array(8080,80,6588,8000,3128,553,554))
|| @fsockopen($_SERVER['REMOTE_ADDR'], 80, $errno, $errstr, 30))
{
exit('Proxy detected');
}
}

Strong Password Validation
Check whether a particular password filled by the user is strong enough or not.

function validatePassword($password){
//must contain 8 characters, 1 uppercase, 1 lowercase and 1 number
return preg_match('/^(?=^.{8,}$)((?=.*[A-Za-z0-9])(?=.*[A-Z])(?=.*[a-z]))^.*$/', $password);
}

Credit Card Validation
Below function validate credit card number format.

function validateCreditCard($cc){
//eg. 746486033718121
return preg_match('/^(?:4[0-9]{12}(?:[0-9]{3})?|5[1-5][0-9]{14}|6011[0-9]{12}|3(?:0[0-5]|[68][0-9])[0-9]{11}|3[47][0-9]{13})$/', $cc);

}