Checks whether a MySQLi connection is responsive; formerly had a reconnect role.
The examples focus on the operation itself, including the important distinction: A simple application query or reconnect strategy is preferable when actual work is required.
What It Does
Use the examples below to observe the behavior on a small dataset before extending it to application code.
Syntax and Return Value
mysqli_ping(...) — requires the corresponding optional extensionThe displayed signature describes the API or identifies any correction or optional dependency. When a parameter is optional, supply it only when the task requires it.
Example 1: Basic Use
Legacy-only: mysqli_ping is deprecated as of PHP 8.4, and auto-reconnect is gone. Do not introduce it into new applications.
<?php
$link = mysqli_connect(getenv('DB_HOST') ?: '127.0.0.1', getenv('DB_USER') ?: 'app', getenv('DB_PASSWORD') ?: '', getenv('DB_NAME') ?: 'demo');
mysqli_set_charset($link, 'utf8mb4');
echo mysqli_ping($link) ? "alive" : "failed";This example is meant for a configured application environment; output depends on the installed extension, external service, or database contents.
Example 2: Checking Behavior
Legacy-only: mysqli_ping is deprecated as of PHP 8.4, and auto-reconnect is gone. Do not introduce it into new applications. mysqli_ping remains deprecated; prefer explicit application operations in new code.
<?php
$link = mysqli_connect(getenv('DB_HOST') ?: '127.0.0.1', getenv('DB_USER') ?: 'app', getenv('DB_PASSWORD') ?: '', getenv('DB_NAME') ?: 'demo');
mysqli_set_charset($link, 'utf8mb4');
echo "legacy-status=" . (int) mysqli_ping($link);This example is meant for a configured application environment; output depends on the installed extension, external service, or database contents.
Example 3: Practical Example
Legacy-only: mysqli_ping is deprecated as of PHP 8.4, and auto-reconnect is gone. Do not introduce it into new applications. mysqli_ping remains deprecated; prefer explicit application operations in new code.
<?php
$link = mysqli_connect(getenv('DB_HOST') ?: '127.0.0.1', getenv('DB_USER') ?: 'app', getenv('DB_PASSWORD') ?: '', getenv('DB_NAME') ?: 'demo');
mysqli_set_charset($link, 'utf8mb4');
echo mysqli_ping($link) === true ? "responsive" : "unavailable";This example is meant for a configured application environment; output depends on the installed extension, external service, or database contents.
Important Behavior and Edge Cases
Deprecated from PHP 8.4; automatic reconnect support has been removed and new code should not rely on ping.
This API is supplied by an optional extension that is not installed in the local test runtime, or requires a different PHP version. The example must be verified in a matching environment.
Deprecated in PHP 8.4: ping no longer provides automatic reconnection; write new code to execute needed operations and reconnect explicitly when appropriate.
Comparison with Related Approaches
| Approach | Difference |
|---|---|
| mysqli_ping | Checks whether a MySQLi connection is responsive; formerly had a reconnect role. |
| Related API or alternative | A simple application query or reconnect strategy is preferable when actual work is required. |
Common Beginner Mistakes
| Mistake | Correct approach |
|---|---|
| Ignoring the operation-specific limits | Deprecated from PHP 8.4; automatic reconnect support has been removed and new code should not rely on ping. |
| Confusing it with a related API | A simple application query or reconnect strategy is preferable when actual work is required. |
Key Takeaways
- Checks whether a MySQLi connection is responsive; formerly had a reconnect role.
- Deprecated from PHP 8.4; automatic reconnect support has been removed and new code should not rely on ping.
- A simple application query or reconnect strategy is preferable when actual work is required.
Use mysqli_ping when its documented behavior matches the problem. Test the relevant edge cases in your own runtime before deploying it.