When working with PHP, is_writeable can help with a specific task: historical alias of is_writable().
This guide shows what is_writeable does, how to use it in code, and which details you should check before relying on the result.
What Is is_writeable in PHP?
Historical alias of is_writable().
Usage: The following examples show calls with suitable values. Consult the function parameters described in the examples, especially when optional arguments or extensions are involved.
Example 1: Basic Usage
The first example introduces is_writeable with a direct PHP expression.
<?php
var_dump(is_writeable(sys_get_temp_dir()));
Observe the value returned or printed by is_writeable and compare it with the input used in this example.
Example 2: A Different Input or Option
This second example demonstrates another input or condition, so you can compare the behavior with the first example.
<?php
var_dump(is_writeable(__FILE__));
Observe the value returned or printed by is_writeable and compare it with the input used in this example.
Practical Example
Here is a small scenario illustrating how is_writeable can fit into application code. Run the example only in an appropriate development environment if it reads files, changes data, starts processes or connects to a service.
<?php
$path = sys_get_temp_dir(); echo is_writeable($path) ? "Writable" : "Read-only";
Observe the value returned or printed by is_writeable and compare it with the input used in this example.
Important Behavior and Edge Cases
- Core behavior: Historical alias of is_writable().
- Important limitation: Prefer the conventional spelling is_writable(); both behave identically.
- Production use: Check return values and handle failures before acting on the result.
Comparison With Related Functions
| Function or Approach | Difference |
|---|---|
is_writeable() | Historical alias of is_writable(). |
is_writable() | Related approach. Its purpose and return value differ; select it when your task matches that operation. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
Overlooking a special case of is_writeable(). | Prefer the conventional spelling is_writable(); both behave identically. |
Using is_writeable() without checking the outcome. | Handle failures and confirm that the output is suitable for the next step. |
Key Takeaways
- Historical alias of is_writable().
- Prefer the conventional spelling is_writable(); both behave identically.
- Test the function with relevant inputs before using it in production.
Use is_writeable when its behavior matches the job you need to complete. For dependable results, consider the input data, returned value and limitations shown above.