Associates result columns with variables filled on each fetch.
The objective is to understand the behavior and operational limits, not only the method name.
What It Does
Associates result columns with variables filled on each fetch.
Syntax and Return Value
mysqli_stmt_bind_result(...)The return value and exceptional cases depend on the call described here: It applies to output columns after SELECT, not to SQL input placeholders.
Requirements: install and enable the corresponding PHP driver or extension and configure the service before running the examples.
Example 1: Basic Use
The SELECT assumes users(id,email) in an actual MySQL database; output depends on its rows.
<?php
$host = getenv('DB_HOST'); $user = getenv('DB_USER'); $password = getenv('DB_PASSWORD'); $database = getenv('DB_NAME');
if (!$host || !$user || $password === false || !$database) throw new RuntimeException('Missing database configuration');
$mysqli = new mysqli($host, $user, $password, $database);
$mysqli->set_charset('utf8mb4');
$userId = 3;
$stmt = $mysqli->prepare("SELECT id, email FROM users WHERE id >= ? ORDER BY id");
$stmt->bind_param("i", $userId);
mysqli_stmt_execute($stmt);
mysqli_stmt_bind_result($stmt,$id,$email);
while (mysqli_stmt_fetch($stmt)) echo $email . PHP_EOL;Example 2: A Second Scenario
The SELECT assumes users(id,email) in an actual MySQL database; output depends on its rows.
<?php
$host = getenv('DB_HOST'); $user = getenv('DB_USER'); $password = getenv('DB_PASSWORD'); $database = getenv('DB_NAME');
if (!$host || !$user || $password === false || !$database) throw new RuntimeException('Missing database configuration');
$mysqli = new mysqli($host, $user, $password, $database);
$mysqli->set_charset('utf8mb4');
$userId = 5;
$stmt = $mysqli->prepare("SELECT id, email FROM users WHERE id >= ? ORDER BY id");
$stmt->bind_param("i", $userId);
mysqli_stmt_execute($stmt);
mysqli_stmt_bind_result($stmt,$id,$email);
while (mysqli_stmt_fetch($stmt)) echo $email . PHP_EOL;Example 3: Practical Checks
The SELECT assumes users(id,email) in an actual MySQL database; output depends on its rows.
<?php
$host = getenv('DB_HOST'); $user = getenv('DB_USER'); $password = getenv('DB_PASSWORD'); $database = getenv('DB_NAME');
if (!$host || !$user || $password === false || !$database) throw new RuntimeException('Missing database configuration');
$mysqli = new mysqli($host, $user, $password, $database);
$mysqli->set_charset('utf8mb4');
$userId = 8;
$stmt = $mysqli->prepare("SELECT id, email FROM users WHERE id >= ? ORDER BY id");
$stmt->bind_param("i", $userId);
mysqli_stmt_execute($stmt);
mysqli_stmt_bind_result($stmt,$id,$email);
while (mysqli_stmt_fetch($stmt)) echo $email . PHP_EOL;Important Behavior and Edge Cases
It applies to output columns after SELECT, not to SQL input placeholders.
For production use, also account for error handling, data validation, resource limits and environment-specific driver behavior.
Comparison with Related Approaches
| Approach | Important distinction |
|---|---|
| mysqli_stmt_bind_result | Associates result columns with variables filled on each fetch. |
| Related API / pattern | get_result returns a mysqli_result with row-fetching methods when mysqlnd is enabled. |
Common Beginner Mistakes
| Mistake | Correct approach |
|---|---|
| Assuming the happy path covers edge cases | It applies to output columns after SELECT, not to SQL input placeholders. |
| Using a related API interchangeably | get_result returns a mysqli_result with row-fetching methods when mysqlnd is enabled. |
Key Takeaways
- Associates result columns with variables filled on each fetch.
- It applies to output columns after SELECT, not to SQL input placeholders.
- get_result returns a mysqli_result with row-fetching methods when mysqlnd is enabled.
Choose this API or pattern when its exact semantics match your task, and verify the result against the database driver and runtime used by your application.