When working with PHP, linkinfo can help with a specific task: returns metadata information about a symbolic link or returns false on failure.
This guide shows what linkinfo does, how to use it in code, and which details you should check before relying on the result.
What Is linkinfo in PHP?
Returns metadata information about a symbolic link or returns false on failure.
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 linkinfo with a direct PHP expression.
<?php
var_dump(linkinfo(__FILE__) !== false);
The code is an illustration; its result depends on the relevant PHP extension, runtime state and input.
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(@linkinfo(__DIR__ . "/not-here") === false);
The code is an illustration; its result depends on the relevant PHP extension, runtime state and input.
Practical Example
Here is a small scenario illustrating how linkinfo 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
$path = __DIR__ . "/current"; echo @linkinfo($path) === false ? "No link information" : "Filesystem metadata found";
The code is an illustration; its result depends on the relevant PHP extension, runtime state and input.
Important Behavior and Edge Cases
- Core behavior: Returns metadata information about a symbolic link or returns false on failure.
- Important limitation: Result values are platform-dependent and not a portable link-target string; use readlink() for a symbolic link target.
- Production use: Check return values and handle failures before acting on the result.
Comparison With Related Functions
| Function or Approach | Difference |
|---|---|
linkinfo() | Returns metadata information about a symbolic link or returns false on failure. |
readlink() | 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 linkinfo(). | Result values are platform-dependent and not a portable link-target string; use readlink() for a symbolic link target. |
Using linkinfo() without checking the outcome. | Handle failures and confirm that the output is suitable for the next step. |
Key Takeaways
- Returns metadata information about a symbolic link or returns false on failure.
- Result values are platform-dependent and not a portable link-target string; use readlink() for a symbolic link target.
- Test the function with relevant inputs before using it in production.
Use linkinfo when its behavior matches the job you need to complete. For dependable results, consider the input data, returned value and limitations shown above.