check if credit card is valid

Use Attribute to check whether the object property data is valid. I. Preface To put it bluntly, ASP. NET has only recently had the opportunity to use MVC to develop and produce projects. There are a large number of server-side data format validation for new and edited form submissions in the project. if else code is to

Before php5.2 if we want to verify that the IP address is valid we need to use the regular to verify that this is only the IP address is not legal, if it is valid we need to call Ping to operate, but after php5.2.0, there

mb_check_encoding-checks if the string is valid in the specified encoding PHP Version requirements: (PHP 4 >= 4.4.3, PHP 5 >= 5.1.3) Description: BOOL Mb_check_encoding ([String $var = NULL [, String $encoding = Mb_internal_encoding ()]]) Checks whether the specified byte stream is valid in the specified encoding. It c

This article describes an example of PHP using mb_check_encoding to check whether the string is valid in the specified encoding. This article describes an example of PHP using mb_check_encoding to check whether the string is valid

Mb_check_encoding-check whether the string is valid in the specified encoding.PHP version requirements: (PHP 4> = 4.4.3, PHP 5> = 5.1.3)Bo: bool mb_check_encoding ([string $ var = NULL [, string $ encoding = mb_internal_encoding ()])Check whether the specified byte stream is

We sometimes need to check the validity of the Web site (URL) entered by the user, Copy Code code as follows: function Checkurl (str) { var regurl = new RegExp (); Regurl.compile ("^[a-za-z]+://[a-za-z0-9-_]+\.[ a-za-z0-9-_%?/.=]+$ "); if (! Regurl.test (str)) { return false; } return true; } Not only from the format, but also to check whether the user entered the URL

function Is_idcard ($id) {$id = Strtoupper ($id); $REGX = "/(^\d{15}$) | (^\d{17} ([0-9]| X) $)/"; $arr _split = Array (); if (!preg_match ($REGX, $id)) {return FALSE; } if (15==strlen ($id))//Check 15-bit {$regx = "/^ (\d{6}) + (\d{2}) + (\d{2}) + (\d{2}) + (\d{3}) $/"; @preg_match ($REGX, $id, $arr _split); Check that the birthday date is

This article describes how to use mb_check_encoding in PHP to check whether the string is valid in the specified encoding. For example, mb_check_encoding-to check whether the string is valid in the specified encoding. PHP version

This article describes how to use mb_check_encoding in PHP to check whether the string is valid in the specified encoding. for example, mb_check_encoding-to check whether the string is valid in the specified encoding. PHP version

Sometimes we need to check the validity of the website (URL) you enter, The code is as follows:Copy code Function CheckUrl (str ){Var RegUrl = new RegExp ();RegUrl. compile ("^ [A-Za-z] +: // [A-Za-z0-9-_] + \. [A-Za-z0-9-_ % ? /. =] + $ ");If (! RegUrl. test (str )){Return false; }Return true;} Check whether the URL entered by the user

The SimpleXML function allows you to convert XML into objects. This object can be processed by using a common attribute selector or array iterator, just like any other object. SimpleXML functions are a core component of PHP. These functions can be used without installation. The SimpleXML function allows you to convert XML into objects. This object can be processed by using a common attribute selector or array iterator, just like any other object. SimpleXML functions are a core component of PHP.

SimpleXML is used to check whether the XML structure meets the specifications. To enable this program to be versatile, a reference file is used as the structure criterion based on the nodes and attributes defined in it, check whether the file meets the basic requirements. The code

Ming: Bool Mb_check_encoding ([String $var = NULL [, String $encoding = Mb_internal_encoding ()]])Checks whether the specified byte stream is valid in the specified encoding. It can effectively avoid the so-called "Invalid code attack (Invalid Encoding Attack)". ParametersVarThe byte stream to check. If this argument is