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PHP Include Files PHP include and require Statements In PHP, you can insert the content of one PHP file into another PHP file before the server executes it. The include and require statements are used to insert useful codes written in other files, in the flow of execution. Include and require are identical, except upon failure: require will produce a fatal error (E_COMPILE_ERROR) and stop the script include ...

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PHP MySQL Connect to a Database The free MySQL database is very often used with PHP. Create a Connection to a MySQL Database Before you can access data in a database, you must create a connection to the database. In PHP, this is done with the mysql_connect() function. Syntax mysql_connect(servername,username,password); Parameter Description servername Optional. Specifies...

PHP MySQL Introduction MySQL is the most popular open-source database system. What is MySQL? MySQL is a database. The data in MySQL is stored in database objects called tables. A table is a collection of related data entries and it consists of columns and rows. Databases are useful when storing information categorically. A company may have a database with the following tables: "Employees", "Products", "Customers"...

PHP Filter PHP filters are used to validate and filter data coming from insecure sources, like user input. What is a PHP Filter? A PHP filter is used to validate and filter data coming from insecure sources. To test, validate and filter user input or custom data is an important part of any web application. The PHP filter extension is designed to make data filtering easier and quicker. Why use a Filter? Almost...

PHP Exception Handling  Exceptions are used to change the normal flow of a script if a specified error occurs. What is an Exception With PHP 5 came a new object oriented way of dealing with errors. Exception handling is used to change the normal flow of the code execution if a specified error (exceptional) condition occurs. This condition is called an exception. This is what normally happens when an exception...

PHP Error Handling  The default error handling in PHP is very simple. An error message with filename, line number and a message describing the error is sent to the browser. PHP Error Handling When creating scripts and web applications, error handling is an important part. If your code lacks error checking code, your program may look very unprofessional and you may be open to security risks. This tutorial contains...

PHP Sending E-mails  PHP allows you to send e-mails directly from a script. The PHP mail() Function The PHP mail() function is used to send emails from inside a script. Syntax mail(to,subject,message,headers,parameters) Parameter Description to Required. Specifies the receiver / receivers of the email subject Required. Specifies the subject of the email....

PHP Session A PHP session variable is used to store information about, or change settings for a user session. Session variables hold information about one single user, and are available to all pages in one application. PHP Session Variables When you are working with an application, you open it, do some changes and then you close it. This is much like a Session. The computer knows who you are. It knows when you...