PHP chown() Function: Usage and Examples

Changes the owner of a file when allowed by the system.

What Is chown() in PHP?

Changes the owner of a file when allowed by the system.

Its syntax is:

chown(string $filename, string|int $user): bool

Parameters:

• $filename — Accepted as string; required argument.
• $user — Accepted as string|int; required argument.

Return type: bool. Most deployments cannot change file ownership. Do not use chown() to bypass access policies.

Availability: Requires a supported OS and sufficient privileges.

Example 1: Basic Usage

<?php

var_dump(chown("/tmp/example.txt", "www-data"));

Result: Results and availability depend on the current PHP process, system permissions, cache, filesystem or installed locale. Most deployments cannot change file ownership. Do not use chown() to bypass access policies.

Example 2: A Different Input

<?php

var_dump(chown("/tmp/example.txt", 1000));

Result: Results and availability depend on the current PHP process, system permissions, cache, filesystem or installed locale. Most deployments cannot change file ownership. Do not use chown() to bypass access policies.

Practical Example: Applying It in a Program

<?php

$filePath = "/tmp/example.txt"; if (is_file($filePath)) { $changed = chown($filePath, "www-data"); echo $changed ? "Owner changed" : "Not permitted"; }

Result: Results and availability depend on the current PHP process, system permissions, cache, filesystem or installed locale. Most deployments cannot change file ownership. Do not use chown() to bypass access policies.

Important Behavior and Edge Cases

• Key behavior: Most deployments cannot change file ownership. Do not use chown() to bypass access policies.
• Environment: Requires a supported OS and sufficient privileges.

Comparison With Related Functions

Common Beginner Mistakes

Key Takeaways

• Changes the owner of a file when allowed by the system.
• Most deployments cannot change file ownership. Do not use chown() to bypass access policies.
• Requires a supported OS and sufficient privileges.

Summary: Most deployments cannot change file ownership. Do not use chown() to bypass access policies.