PHP Phar::getSignature() Method: Usage and Examples

PHAR archives can package multiple resources into a single file. Phar::getSignature() Method addresses a specific part of that process: returns the archive signature algorithm and signature value. The examples distinguish archive-level effects from member-level effects.

What Is Phar::getSignature() Method?

Returns the archive signature algorithm and signature value.

Its syntax is:

Phar::getSignature()

This function or method takes no parameters.

Return value: The declared return type is array|false. A cryptographic hash alone does not establish publisher authenticity without a trusted signature key.

Requirements: The Phar extension must be enabled. Creating or modifying executable PHAR archives generally requires the phar.readonly setting to be disabled before startup; do not change server configuration just to view this guide.

Important: A cryptographic hash alone does not establish publisher authenticity without a trusted signature key.

Example 1: Basic Usage

The basic example focuses on the behavior of Phar::getSignature() Method: returns the archive signature algorithm and signature value. Inputs are defined locally or shown as application-controlled paths.

<?php

$archivePath = sys_get_temp_dir() . "/example-package.phar";
$archive = new Phar($archivePath);
$signature = $archive->getSignature();
if ($signature !== false) { echo $signature["hash_type"]; }

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 Phar::getSignature() Method. Notice the different checks, arguments, or output handling.

<?php

$archive = new Phar(__DIR__ . "/trusted.phar");
$signature = $archive->getSignature();
if (is_array($signature)) { echo $signature["hash_type"] . ":" . substr($signature["hash"], 0, 12); }

This variation matters because a cryptographic hash alone does not establish publisher authenticity without a trusted signature key.

Practical Example: Working with Archive Entries

The following example demonstrates how Phar::getSignature() Method fits into a more complete file or archive workflow, including inputs and appropriate checks.

<?php

$archive = new Phar(__DIR__ . "/release.phar");
$signature = $archive->getSignature();
if ($signature !== false) {
    echo "Algorithm: " . $signature["hash_type"];
}

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 archive signature algorithm and signature value.
• Limitation: A cryptographic hash alone does not establish publisher authenticity without a trusted signature key.
• Availability: The Phar extension must be enabled. Creating or modifying executable PHAR archives generally requires the phar.readonly setting to be disabled before startup; do not change server configuration just to view this guide.

Comparison With Related Functions

Use Phar::getSignature() Method for the specific behavior described above. The related operation, hash_file(), serves a different purpose; do not substitute it unless that different behavior is intended.

Common Beginner Mistakes

Key Takeaways

• Returns the archive signature algorithm and signature value.
• A cryptographic hash alone does not establish publisher authenticity without a trusted signature key.
• Related operation: hash_file() — Calculates a file digest but does not report the archive signature metadata or algorithm.

Phar::getSignature() Method is useful when its specific behavior matches your application requirement. Keep paths controlled, check failures, and handle environment-dependent operations deliberately.