if(isset($_POST['email']))
{
$emal = $_POST['email'];
if(preg_match("/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/",$emal))
{
echo "Valid E-mail";
}
else
{
echo "Invalid Valid E-mail";
}
}
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If you wish to check the syntax of your source code, you need to run the code through the PHP CLI with the -l option. There are also some online resources to validate the syntax. This will check only the syntax of your file. This will not however detect runtime errors or logic errors. You must absolutely run the script for the best possible code validation.
We can use php tags in different ways. <?php //php code to be written here ?> OR <? //php code ?> This tag will not work when we using editors such as macromedia dreamweaver. OR < script language="php"> //php code </script>
types of validations are: required field validation range validation pattern matching validation database specific validation numeric validation
The benefits of running PHP-CGI are:** It is more secure. The PHP runs as your user rather than dhapache. That means you can put your database passwords in a file readable only by you and your php scripts can still access it!* It is more flexible. Because of security concerns when running PHP as an Apache module (which means it runs as our dhapache user), we have disabled a number of commands with the non-CGI PHP. This will cause installation problems with certain popular PHP scripts (such as Gallery) if you choose to run PHP not as a CGI!* It's just as fast as running PHP as an Apache module, and we include more default libraries.There are a FEW VERY MINOR drawbacks to running PHP-CGI. They are:** Custom 404 pages won't work for .php files with PHP-CGI. Or will they? See n74's comment below!* Variables in the URL which are not regular ?foo=bar variables won't work without using mod_rewrite (http://httpd.apache.org/docs/mod/mod_rewrite.html) (example.com/blah.php/username/info/variable).* Custom php directives in .htaccess files (php_include_dir /home/user;/home/user/example_dir) won't work.* The $_SERVER['SCRIPT_NAME'] variable will return the php.cgi binary rather than the name of your script* Persistant database connections will not work. PHP's mysql_pconnect() function will just open a new connection because it can't find a persistant one.If one of those is a show-stopper for you, you can easily switch to running PHP as an Apache module and not CGI, but be prepared for a bunch of potential security and ease-of-use issues! If you don't know what any of these drawbacks mean, you're fine just using the default setting of PHP-CGI and not worrying about anything!
PHP is a recursive acronym for "PHP: Hypertext Preprocessor" created by The PHP Group. PHP is a widely used server-side scripting language and the general purpose of PHP is to create dynamic Web Pages. For more information, visit the PHP website.