fileinode() Function is one of the PHP operations used in filesystem and stream workflows. Returns the filesystem inode number for a path. The examples below show what it does and how to handle its result.
What Is fileinode() Function?
Returns the filesystem inode number for a path.
Its syntax is:
fileinode(string $filename)
The parameters are:
string $filename— The source or destination filesystem path.
Return value: The declared return type is int|false. An inode is not a portable persistent identifier across file moves or filesystems.
Important: An inode is not a portable persistent identifier across file moves or filesystems.
Example 1: Basic Usage
The basic example focuses on the behavior of fileinode() Function: returns the filesystem inode number for a path. Inputs are defined locally or shown as application-controlled paths.
<?php
$inodeNumber = fileinode(__FILE__);
if ($inodeNumber !== false) { echo $inodeNumber; }
The displayed value, file content or return status depends on the input and surrounding environment. Results involving local paths, identifiers or generated files are not fixed values.
Example 2: A Different Use Case
This second example illustrates another input or execution condition for fileinode() Function. Notice the different checks, arguments, or output handling.
<?php
$inodeNumber = @fileinode(__DIR__ . "/missing.txt");
var_dump($inodeNumber === false);
This variation matters because an inode is not a portable persistent identifier across file moves or filesystems.
Practical Example: Using the Operation in an Application
The following example demonstrates how fileinode() Function fits into a more complete file or archive workflow, including inputs and appropriate checks.
<?php
$identifier = fileinode(__FILE__);
if ($identifier !== false) { echo "File inode: " . $identifier; }
The operation shown is an illustrative script. Adapt the filenames, required permissions, and error handling to your own controlled application environment before running it.
Important Behavior and Edge Cases
- Function behavior: Returns the filesystem inode number for a path.
- Limitation: An inode is not a portable persistent identifier across file moves or filesystems.
Comparison With Related Functions
| Function or Method | Difference |
|---|---|
fileinode() Function | Returns the filesystem inode number for a path. |
filemtime() | Returns a modification timestamp; fileinode() returns a filesystem inode identifier. |
Use fileinode() Function for the specific behavior described above. The related operation, filemtime(), serves a different purpose; do not substitute it unless that different behavior is intended.
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Assuming filesystem metadata is always available and current. | An inode is not a portable persistent identifier across file moves or filesystems. Check failure returns and refresh stat information when files may have changed. |
| Treating filemtime() as an interchangeable replacement for fileinode() Function. | Returns a modification timestamp; fileinode() returns a filesystem inode identifier. |
Key Takeaways
- Returns the filesystem inode number for a path.
- An inode is not a portable persistent identifier across file moves or filesystems.
- Related operation: filemtime() — Returns a modification timestamp; fileinode() returns a filesystem inode identifier.
fileinode() Function is useful when its specific behavior matches your application requirement. Keep paths controlled, check failures, and handle environment-dependent operations deliberately.