Return an array from mysqli stmt query - php

Question

I'm trying to convert a site to use prepared mysql statements, however I'm having some trouble replacing my use of fetch_array().
The comments on php.net offer a solution which I would have thought should work but for some reason I'm getting strange undefined constant errors when calling a function via call_user_func_array() can someone suggest a better way of doing it?
Here's the function I'm using at the moment. I've dumbed it down a bit for posting on here (it's part of a larger class which extends mysqli and handles error catching etc) so sorry if I've made any mistakes copy and pasting it.
public static function stmt_bind_assoc(&$stmt, &$out) {
$data = mysqli_stmt_result_metadata($stmt);
$fields = array();
$out = array();
$fields[0] = $stmt;
$count = 1;
while($field = mysqli_fetch_field($data)) {
$fields[$count] = &$out[$field->name];
$count++;
}
call_user_func_array(mysqli_stmt_bind_result, $fields);
}
public function fetch_array($rawQuery) {
$stmt = $this->prepare($rawQuery);
$row = array();
self::stmt_bind_assoc($stmt, $row);
$result = $stmt->fetch();
$stmt->free();
return $result;
}
The errors I get are:
Notice: Use of undefined constant mysqli_stmt_bind_result - assumed 'mysqli_stmt_bind_result'
Fatal error: Call to undefined method mysqli_stmt::free()

Answer 1

The first error comes from your call_user_func_array statement: you need quotes around the mysqli_stmt_bind_result, otherwise PHP assumes it's a constant.
And there's no free() function in mysqli_stmt, use $stmt->free_result() instead.

Answer 2

$servername = "localhost"; $username = "root"; $password = ""; $dbnam = "test";
// Create connection $conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection if (mysqli_connect_errno()) {
die("Connection failed: %s\n" . mysqli_connect_errno()); }
$stmt = mysqli_prepare($conn, "SELECT * FROM myguests") or
die(mysqli_error($conn)); mysqli_stmt_execute($stmt);
$data = mysqli_stmt_result_metadata($stmt);
$fields = array();
$out = array();
$fields[0] = &$stmt;
$count = 1;
while($field = mysqli_fetch_field($data)) {
$fields[$count] = &$out[$field->name];
$count++;
}
call_user_func_array("mysqli_stmt_bind_result", $fields);
while(mysqli_stmt_fetch($stmt)) print_r($out);
$stmt->close(); $conn->close();
Works great on me, hope it helps