When working with PharData in PHP, it helps to understand exactly what getSupportedSignatures() does and when the result is useful. This guide uses small examples followed by a practical pattern.
What Is getSupportedSignatures() in PHP?
Lists signature algorithms available for Phar archives.
Syntax:
getSupportedSignatures() : array
Parameters:
This method takes no parameters.
Return value: PHP declares array for this API in PHP 8.4 where available. For operations that can fail, check errors or exceptions instead of assuming success.
Example 1: Basic Usage
The first example focuses on the operation itself without unrelated application logic.
<?php
print_r(PharData::getSupportedSignatures());
Lists signature algorithms available for Phar archives. The examples distinguish data archives from executable Phar packages. For a TAR/ZIP file, verify the format before using compression, signature, or stub features.
Example 2: Handling Conditions and Failures
Production code must handle cases where the archive, file, runtime feature, or source path is not available. The following example demonstrates an additional usage pattern.
<?php
try {
print_r(PharData::getSupportedSignatures());
} catch (Throwable $exception) {
error_log($exception->getMessage());
}
Only catch errors you can handle meaningfully. A PHP warning, a false return value, and an exception are not interchangeable; consult the behavior explained above.
Practical Example: Integrating the Operation
This practical variation shows how to place the operation in a larger file or inspection workflow. The paths and names are illustrative rather than server deployment instructions.
<?php
// Consider whether this is an executable Phar feature or a data-archive operation.
print_r(PharData::getSupportedSignatures());
Do not copy sample paths blindly into production. Validate allowed paths and confirm the appropriate extension and filesystem permissions first.
Important Behavior and Edge Cases
- PharData works with TAR/ZIP data archives and does not make them executable PHP applications.
- The format and installed zlib/bz2 extensions determine which compression operations are possible.
- Check file paths and archive contents before extracting or publishing files.
Comparison With Related Functions
| Function or Method | Purpose |
|---|---|
PharData::getSupportedSignatures | Lists signature algorithms available for Phar archives. |
Phar::addFromString() | Works with executable Phar archives and their entries. |
PharData::extractTo() | Extracts data from supported TAR/ZIP archives to disk. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Assuming TAR/ZIP data archives behave like executable Phar programs. | Choose PharData for data storage and Phar only when an executable package is required. |
| Treating archive metadata or CRC32 as a trust guarantee. | Verify provenance separately and avoid unserializing untrusted objects. |
| Performing archive writes without checking format and permissions. | Verify write capability, target paths, and supported compression first. |
Key Takeaways
- Lists signature algorithms available for Phar archives.
- PharData works with TAR/ZIP data archives and does not make them executable PHP applications.
- The format and installed zlib/bz2 extensions determine which compression operations are possible.
PharData::getSupportedSignatures() is useful when its specific purpose matches your application. Keep the examples focused, respect the restrictions above, and validate real-world inputs rather than relying on the example values.