PHP openssl_get_md_methods() Function

The openssl_get_md_methods() function is an inbuilt function in PHP that is used to retrieve a list of available digest (message digest) methods supported by OpenSSL.

Syntax:

openssl_get_md_methods(bool $aliases = false): array

Parameters: This function accepts one parameter which is described below.

• $aliases: If $aliases are true, any aliases for the digest methods will be included in the array. 

Return Values: This function returns an array of strings representing the available digest methods supported by OpenSSL. If no digest methods are available, it will return “false”.

Example 1: The following program demonstrates the openssl_get_md_methods() function.

PHP

<?php
$digest_methods = openssl_get_md_methods();

if ($digest_methods !== false) {
    echo "Available digest methods:\n";
    foreach ($digest_methods as $method) {
        echo "- $method\n";
    }
} else {
    echo "No digest methods available.";
}
?>

Output:

Available digest methods:
- blake2b512
- blake2s256
- md4
- md5
- md5-sha1
- ripemd160
- sha1
- sha224
- sha256
- sha3-224
- sha3-256
- sha3-384
- sha3-512
- sha384
- sha512
- sha512-224
- sha512-256
- shake128
- shake256
- sm3
- whirlpool
 

Example 2: The following program demonstrates the openssl_get_md_methods()  function.

PHP

<?php
$digest_methods = openssl_get_md_methods();

if ($digest_methods !== false) {
    echo "Available digest methods: ";
    echo implode(", ", $digest_methods);
} else {
    echo "No digest methods available.";
}
?>

Output:

Available digest methods: blake2b512, blake2s256, md4, md5, md5-sha1,
 ripemd160, sha1, sha224, sha256, sha3-224, sha3-256, sha3-384, 
 sha3-512, sha384, sha512, sha512-224, sha512-256, shake128, shake256, sm3, whirlpool  

Reference: https://www.php.net/manual/en/function.openssl-get-md-methods.php