How to Call a MySQL Stored Procedure from PHP Code?

How to Call a MySQL Stored Procedure from PHP Code

Background:
Calling MySQL stored procedures from PHP code allows you to execute complex database operations effectively. This article demonstrates the best approach for invoking a stored procedure from PHP using MySQL versions 4.1.11 (client) and 5.0.45 (server).

Stored Procedure Definition:
The example stored procedure, getTreeNodeName, returns the name of a node given its ID:

DELIMITER $$

DROP FUNCTION IF EXISTS `getNodeName` $$
CREATE FUNCTION `getTreeNodeName`(`nid` int) RETURNS varchar(25) CHARSET utf8
BEGIN
 DECLARE nodeName varchar(25);
 SELECT name into nodeName FROM tree
 WHERE id = nid;
 RETURN nodeName;
END $$

DELIMITER ;

PHP Code to Invoke Stored Procedure:

To call the getTreeNodeName procedure, you can use the mysqli extension instead of the deprecated mysql extension. Here's the PHP code:

<?php 

// enable error reporting
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

// connect to database
$connection = mysqli_connect("hostname", "user", "password", "db", "port");

// run the stored procedure
$result = mysqli_query($connection, "CALL getTreeNodeName");

// loop the result set
while ($row = mysqli_fetch_array($result)) {
  echo $row[0] . " - " . $row[1]; // replace with appropriate column indices
}

Note:
Many users have reported issues with using the older mysql_connect, mysql_query, and mysql_fetch_array functions. It's recommended to use the mysqli extension instead.

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