PHP Validation Function for HTML Safe

Simple php function to validate html tags in given content. In some cases we need to check if the given string contains html tags in order to avoid hacking attends and also to avoid unwanted elements changing the layout of our site.

function validateHtmlSafe($value) {
    return (bool)(!preg_match("/<(.*)>.*<$1>/", $value));
}

Submit URL to Search Engines for Indexing

In order to generate organic traffic to our website, we need our site links to be indexed in search engines. For this, we need to make search engines crawl our URLs. This function helps in submitting our URLs and sitemap XML links to major search engines so that our links gets indexed easily. We need to pass the URL as a parameter for the function is all we need to do.


function submitUrl2SearchEngine($site_url) {
    // Eg: $site_url = http://www.demowebsite.com/sitemap.xml
    @file_get_contents("http://www.google.com/webmasters/sitemaps/ping?sitemap=$site_url");
    @file_get_contents("http://www.bing.com/webmaster/ping.aspx?siteMap=$site_url");
    @file_get_contents("http://search.yahooapis.com/SiteExplorerService/V1/updateNotification?appid=YahooDemo&url=$site_url");
    @file_get_contents("http://submissions.ask.com/ping?sitemap=$site_url");  
}

PHP Function to Validate Hex Color Code

PHP function to validate the given value for valid hex color code. Validate using this simple php function for valid hex color code.

function validateHexColor($color_code) {
    return (bool)preg_match('/^#?+[0-9a-f]{3}(?:[0-9a-f]{3})?$/i', $color_code);
}

PHP Random String Generator

Small php snippet to generate a random string. Simple php function to generate random key/salt for encryption in php.

function randomString($length) {
    $allchars = array_merge( range('a','z'), range('A', 'Z'),range(0,9));
    $allchars = implode("", $allchars);
    return substr(str_shuffle($allchars), 0, $length);
}

PHP Function to Validate Alpha Characters

Validate alpha characters using php snippets. This function allows only alphabets either in small letters or in capital letters. Php regex that allows only alpha characters.

function validateAlpha($string) {
    return (bool)preg_match("/^([a-zA-Z])+$/i", $string);
}

Validate MAC Address in PHP

Simple snippet to validate MAC address in php. This functions receives mac address as input and returns a boolean value based on the check. If mac address is not valid function will return false or if valid it will return true.

function validateMacAddress($mac_address)
    return (bool)preg_match('/^([0-9a-fA-F][0-9a-fA-F]:){5}([0-9a-fA-F][0-9a-fA-F])$/', $mac_address);
}

PHP Function to Validate String Length

Simple php function to validate the maximum length of a given string. Use this function to test if a given string's length is within the allowed limit. Validate maximum length of a string in php.

function validateMaxlength($string, $max_len) {
    return (strlen($string) <= (int)$max_len);
}