Reads the next statement row into variables previously bound with mysqli_stmt_bind_result.
The objective is to understand the behavior and operational limits, not only the method name.
What It Does
Reads the next statement row into variables previously bound with mysqli_stmt_bind_result.
Syntax and Return Value
mysqli_stmt_fetch(...)The return value and exceptional cases depend on the call described here: Returns true for a fetched row, null when there are no more rows, and false on failure.
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 $id . 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 $id . 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 $id . PHP_EOL;Important Behavior and Edge Cases
Returns true for a fetched row, null when there are no more rows, and false on failure.
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_fetch | Reads the next statement row into variables previously bound with mysqli_stmt_bind_result. |
| Related API / pattern | mysqli_fetch_assoc reads rows from a mysqli_result instead of bound statement variables. |
Common Beginner Mistakes
| Mistake | Correct approach |
|---|---|
| Assuming the happy path covers edge cases | Returns true for a fetched row, null when there are no more rows, and false on failure. |
| Using a related API interchangeably | mysqli_fetch_assoc reads rows from a mysqli_result instead of bound statement variables. |
Key Takeaways
- Reads the next statement row into variables previously bound with mysqli_stmt_bind_result.
- Returns true for a fetched row, null when there are no more rows, and false on failure.
- mysqli_fetch_assoc reads rows from a mysqli_result instead of bound statement variables.
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.