When a PHP application needs to uses pcntl_sigtimedwait to process its supported input, choosing the right API and checking its results helps keep code understandable and dependable. This guide explains pcntl_sigtimedwait with focused examples and important details.
What Is pcntl_sigtimedwait in PHP?
pcntl_sigtimedwait uses pcntl_sigtimedwait to process its supported input. Requires the PCNTL extension on a supported Unix system. Block the intended signal and distinguish timeout from received signals.
Syntax:
pcntl_sigtimedwait(signals, info, seconds, nanoseconds) : int|falseParameters and return value: Parameters: <required> array $signals; <optional> &$info = []; <optional> int $seconds = 0; <optional> int $nanoseconds = 0. Check the return value or modified object rather than assuming the operation always succeeds.
Important: The code examples use representative input rather than production credentials. Confirm that the required PHP extension is installed.
Example 1: Basic Usage
Start with a compact input so the main operation is visible.
<?php
if (function_exists("pcntl_sigtimedwait")) { echo "pcntl available"; }
Uses pcntl_sigtimedwait to process its supported input. Requires the PCNTL extension on a supported Unix system. Block the intended signal and distinguish timeout from received signals.
Example 2: A Different Input
The next example changes the input or option to illustrate another behavior.
<?php
if (function_exists("pcntl_sigprocmask")) { echo "Signal API available"; }
Compare this result with the first example. Requires the PCNTL extension on a supported Unix system. Block the intended signal and distinguish timeout from received signals.
Practical Example: Applying the Function
This example combines the API with a realistic processing step and shows where to check its result.
<?php
if (function_exists("pcntl_sigtimedwait") && function_exists("pcntl_sigprocmask")) {
pcntl_sigprocmask(SIG_BLOCK, [SIGUSR1]);
$info = [];
$signal = pcntl_sigtimedwait([SIGUSR1], $info, 1, 0);
var_dump($signal);
}
Adapt the inputs to your application and validate the output before storing or displaying it. Requires the PCNTL extension on a supported Unix system. Block the intended signal and distinguish timeout from received signals.
Important Behavior and Edge Cases
- Main purpose: Uses pcntl_sigtimedwait to process its supported input.
- Errors and boundaries: Requires the PCNTL extension on a supported Unix system. Block the intended signal and distinguish timeout from received signals.
- Environment: The code examples use representative input rather than production credentials. Confirm that the required PHP extension is installed.
Comparison With Related Functions
| Function or Approach | When to Use It |
|---|---|
pcntl_sigtimedwait | Uses pcntl_sigtimedwait to process its supported input. |
| Related PHP functions | Consider this alternative when you need different behavior or a different abstraction. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Assuming the operation succeeds for every input | Requires the PCNTL extension on a supported Unix system. Block the intended signal and distinguish timeout from received signals. |
| Ignoring runtime requirements or variable output | The code examples use representative input rather than production credentials. Confirm that the required PHP extension is installed. |
| Using the wrong API for the goal | Compare pcntl_sigtimedwait with Related PHP functions before selecting an approach. |
Key Takeaways
- Uses pcntl_sigtimedwait to process its supported input.
- Requires the PCNTL extension on a supported Unix system. Block the intended signal and distinguish timeout from received signals.
- The code examples use representative input rather than production credentials. Confirm that the required PHP extension is installed.
Use pcntl_sigtimedwait when you need to uses pcntl_sigtimedwait to process its supported input. The three examples move from a simple call to a practical use. Validate all external input and handle failures explicitly.