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PHP close() and mysqli_close() | Close Database Connection
This article is created to cover the two functions of PHP, that are:
- close()
- mysqli_close()
Both the functions are used to close a previously opened connection to the database. The only difference is, the close() works with PHP MySQLi object-oriented script, whereas the mysqli_close() works with PHP MySQLi procedural script.
PHP close()
The PHP close() function is used to close a previously opened database connection in PHP MySQLi object-oriented style. For example:
<?php $server = "localhost"; $user = "root"; $pass = ""; $db = "codescracker"; $conn = new mysqli($server, $user, $pass, $db); if($conn -> connect_errno) { echo "Connection to the database failed!<BR>"; echo "Reason: ", $conn -> connect_error; exit(); } else { echo "Connection to the database, established."; // block of code, to process further... } $conn -> close(); ?>
Note - The mysqli() is used to open a connection to the MySQL database server, in object-oriented style.
Note - The new keyword is used to create a new object.
Note - The connect_errno is used to get/return the error code (if any) from last connect call, in object-oriented style.
Note - The connect_error is used to get the error description (if any) from last connection, in object-oriented style.
Note - The exit() is used to terminate the execution of the current PHP script.
PHP close() Syntax
The syntax of close() function in PHP, is:
connectionVariable -> close();
PHP mysqli_close()
The PHP mysqli_close() function is used to close a previously opened database connection in PHP MySQLi procedural style. For example:
<?php $server = "localhost"; $user = "root"; $pass = ""; $db = "codescracker"; $conn = mysqli_connect($server, $user, $pass, $db); if(mysqli_connect_errno()) { echo "Connection to the database failed!<BR>"; echo "Reason: ", mysqli_connect_error(); exit(); } else { echo "Connection to the database, established."; // block of code, to process further... } mysqli_close($conn); ?>
Note - The mysqli_connect() is used to open a connection to the MySQL database server, in procedural style.
Note - The mysqli_connect_errno() is used to get/return the error code (if any) from last connect call, in procedural style.
Note - The mysqli_connect_error() is used to return the error description (if any) from the last connection, in procedural style.
PHP mysqli_close() Syntax
The syntax of mysqli_close() function in PHP, is:
mysqli_close(connectionVariable);
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