How do you access OUT parameters from MySQL stored procedures in PHP?

Accessing Out Values in PHP MySql Stored Procedures

MySQL documentation offers limited guidance on accessing out parameters in stored procedures. Here's how to retrieve an out parameter value using PHP:

Answer:

As mentioned in a previous discussion on the MySQL forums:

For PHP's mysqli API, using a stored procedure with an IN parameter (i) and OUT parameter (j), such as "myproc( IN i int, OUT j int)":

<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 = $mysqli->store_result()) {
      echo "<b>Result #$results</b>:<br>";
      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>

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