Lists digest algorithm method names known to the installed OpenSSL library.
Before using it, identify which data, connection or runtime state the operation reads or changes. This avoids examples that appear to work but apply to a different context.
What Is openssl_get_md_methods() in PHP?
Lists digest algorithm method names known to the installed OpenSSL library.
Syntax:
<?php
// Signature for reference only
openssl_get_md_methods([optional] bool $aliases) : array
Parameters and Return Value
$aliases— Optional bool argument supplied to this operation.
The declared return type is array.
Example 1: Basic Usage
<?php
print_r(openssl_get_md_methods());Lists digest algorithm method names known to the installed OpenSSL library.
Example 2: Another Case
<?php
$availableItems = openssl_get_md_methods();
echo count($availableItems);The second sample illustrates a different way to inspect or handle this operation. Configure the underlying session, socket, key material or connection first.
Practical Example
<?php
$availableItems = openssl_get_md_methods();
foreach (array_slice($availableItems, 0, 5) as $item) { echo is_array($item) ? json_encode($item) : $item; echo "\n"; }The practical example is a teaching scenario. Change sample configuration and credentials before using a similar design in an application.
Important Behavior and Edge Cases
- Use trusted certificate and key material; never print private keys or disclose secrets in logs.
- Relevant PHP environment: openssl. Ensure the required extension and operating-system capabilities are present.
- Check results and release resources where necessary; successful syntax alone does not guarantee a successful operation.
Comparison With Related Functions
| Option | When to Use It |
|---|---|
openssl_get_md_methods | Lists digest algorithm method names known to the installed OpenSSL library. |
openssl_pkey_get_details | Use this related operation for its different responsibilities; do not assume identical inputs or return values. |
Common Beginner Mistakes
| Mistake | Correct Approach |
|---|---|
| Confusing public and private keys | Use the appropriate key type for each operation and never disclose secret key data. |
| Assuming every algorithm is safe for every purpose | Choose modern algorithms and protocol combinations supported by your deployment. |
| Printing certificate and key material to visitors | Keep cryptographic diagnostics restricted and redact secrets. |
Key Takeaways
- Lists digest algorithm method names known to the installed OpenSSL library.
- Use trusted certificate and key material; never print private keys or disclose secrets in logs.
- Validate inputs and handle failure conditions before integrating this operation into a production workflow.
Lists digest algorithm method names known to the installed OpenSSL library. Use the appropriate runtime and treat any environment-dependent output as an example, not a guaranteed result.