How to Access Out Parameters in MySQL Stored Procedures with PHP?

Accessing Out Parameters in PHP MySql Stored Procedures

When working with stored procedures in MySQL using PHP, accessing the values of out parameters can be a challenge. This article provides a solution based on MySQL's documentation and a forum thread.

Method:

1. Use the mysqli::multi_query() function to execute the stored procedure and store the result in a variable ($res).
2. Instantiate a variable to store the out parameter value ($x in this example).
3. Call mysqli::store_result() to retrieve the result set.
4. Use mysqli::fetch_row() to iterate over the rows and display the values, including the out parameter value (@x).

Code Example:

<code class="php">$mysqli = new mysqli("HOST", "USR", "PWD", "DBNAME");
$ivalue = 1;
$res = $mysqli->multi_query("CALL myproc($ivalue, @x);SELECT @x");

if ($res) {
  $results = 0;
  do {
    if ($result = $mysqli->store_result()) {
      printf("<b>Result #%u</b>:<br/>", ++$results);
      while ($row = $result->fetch_row()) {
        foreach ($row as $cell) {
          echo $cell, " ";
        }
      }
      $result->close();
      if ($mysqli->more_results()) {
        echo "<br/>";
      }
    }
  } while ($mysqli->next_result());
}

$mysqli->close();</code>

By using this method, you can effectively access the values of out parameters in stored procedures from your PHP code.

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