Pcntl\QosClass represents supported QoS scheduling classes where the enum exists.
What Is Pcntl\QosClass::cases in PHP?
Pcntl\QosClass::cases() enumerates supported quality-of-service classes.
Pcntl\QosClass::cases() : arrayThis operation does not accept method arguments.
Return type: array. This API depends on the PCNTL extension and platform support; its presence and behavior can vary by system.
Requirement: Pcntl\QosClass is available from PHP 8.4 on supported Apple platforms; merely listing enum cases does not change process scheduling.
Example 1: Understanding the Basic Behavior
<?php
print_r(\Pcntl\QosClass::cases());Requires the Pcntl QosClass API on a compatible Apple platform.
Explanation: Pcntl\QosClass::cases() enumerates supported quality-of-service classes.
Example 2: Testing Another Case
<?php
var_dump(\Pcntl\QosClass::cases());Requires the Pcntl QosClass API on a compatible Apple platform.
Explanation: This API depends on the PCNTL extension and platform support; its presence and behavior can vary by system.
Practical Example: Applying the Operation
<?php
$availableClasses = \Pcntl\QosClass::cases();
foreach ($availableClasses as $class) { echo $class->name . "
"; }Requires the Pcntl QosClass API on a compatible Apple platform.
Explanation: The available values depend on PHP version and operating-system support; class cases do not set process priorities by themselves.
Important Behavior and Edge Cases
- This API depends on the PCNTL extension and platform support; its presence and behavior can vary by system.
- The available values depend on PHP version and operating-system support; class cases do not set process priorities by themselves.
Comparison With Related Approaches
| Approach | When to Use It |
|---|---|
Pcntl\QosClass::cases | Pcntl\QosClass::cases() enumerates supported quality-of-service classes. |
pcntl_setqos_class() | QosClass::cases() lists available QoS values; pcntl_setqos_class() applies an option where the Apple-specific API is supported. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Assuming the QoS enum alone modifies scheduling or is available on every operating system. | This API depends on the PCNTL extension and platform support; its presence and behavior can vary by system. |
| Choosing pcntl_setqos_class() without checking whether it provides the same result. | QosClass::cases() lists available QoS values; pcntl_setqos_class() applies an option where the Apple-specific API is supported. |
Key Takeaways
- Pcntl\QosClass::cases() enumerates supported quality-of-service classes.
- This API depends on the PCNTL extension and platform support; its presence and behavior can vary by system.
- The available values depend on PHP version and operating-system support; class cases do not set process priorities by themselves.
The examples demonstrate where Pcntl\QosClass::cases fits within process-control enums. Verify the relevant preconditions whenever you adapt the code to real data.