PHP getmyuid() Function: Usage and Examples

Use getmyuid() when you need to returns the owning user ID of the PHP script file where available in a PHP application. The examples below show the actual operation and its limitations.

What Is getmyuid() in PHP?

Returns the owning user ID of the PHP script file where available. The exact signature supported by your installation depends on its PHP version and enabled extensions.

Its syntax is:

getmyuid(): int|false

Parameters and return value: The parameter types, optional arguments, references, and return type are shown in the signature above. Optional parameters are marked with an ellipsis in this reference signature.

Example 1: Basic Usage

<?php

var_dump(getmyuid());

Result: Run the example in an environment that supports the function. Any values depending on operating-system state, installed extensions, process configuration, or network access must be checked on the target server.

Example 2: Different Input or Behavior

<?php

echo getmyuid() === false ? "Unavailable" : "User ID available";

Result: Run the example in an environment that supports the function. Any values depending on operating-system state, installed extensions, process configuration, or network access must be checked on the target server.

Practical Example: Applying the Function

<?php

$ownerId = getmyuid(); if ($ownerId !== false) echo "Script owner UID: " . $ownerId;

Result: Run the example in an environment that supports the function. Any values depending on operating-system state, installed extensions, process configuration, or network access must be checked on the target server.

Important Behavior and Edge Cases

It does not necessarily equal the effective UID of the running PHP process.

Comparison With Related Functions

Common Beginner Mistakes

Key Takeaways

• Returns the owning user ID of the PHP script file where available.
• It does not necessarily equal the effective UID of the running PHP process.
• posix_geteuid() checks the effective process UID on POSIX systems.

Use getmyuid() for the specific operation demonstrated above. Check its prerequisites and handle failure conditions before using it with production data.