Using PHP's Password Hashing APIs with Argon2id

Hash passwords using PASSWORD_ARGON2ID when the runtime supports it and tune memory/time costs. The examples separate the essential operation from the conditions a production implementation must enforce.

What It Does

Hash passwords using PASSWORD_ARGON2ID when the runtime supports it and tune memory/time costs.

Prerequisites

Use a dedicated development environment with test accounts and records. Separate authorization, validation and error handling from response formatting; never copy demonstration-only secrets into production.

Example 1: Core Behavior

The first example isolates the core operation so its result is easy to understand.

<?php
if (!defined('PASSWORD_ARGON2ID')) throw new RuntimeException('Argon2id unavailable');
$hash = password_hash('strong test password', PASSWORD_ARGON2ID);
echo password_verify('strong test password', $hash) ? 'Verified' : 'Rejected';

Example 2: Alternative or Failure Case

The second example demonstrates an alternative outcome, rule or failure condition.

<?php
if (!defined('PASSWORD_ARGON2ID')) throw new RuntimeException('Argon2id unavailable');
$hash = password_hash('long-password', PASSWORD_ARGON2ID, ['memory_cost'=>65536,'time_cost'=>3,'threads'=>1]);
echo password_get_info($hash)['algoName'];

Practical Example: Applying the Rule

The practical example shows how to carry the same constraint into application code.

<?php
if (!defined('PASSWORD_ARGON2ID')) throw new RuntimeException('Argon2id unavailable');
$hash = password_hash('correct', PASSWORD_ARGON2ID);
$verified = password_verify('wrong', $hash);
echo $verified ? 'Access granted' : 'Access denied';

Important Behavior and Edge Cases

Argon2id availability depends on the PHP build; never store passwords or use fast generic hashes for them.

Comparison with Related Functions or Patterns

Common Beginner Mistakes

Key Takeaways

• Hash passwords using PASSWORD_ARGON2ID when the runtime supports it and tune memory/time costs.
• Argon2id availability depends on the PHP build; never store passwords or use fast generic hashes for them.
• password_verify checks a candidate against a stored password hash.

Select this API or pattern based on its documented behavior and the trust boundaries in your own application, and test all external integrations against their actual deployments.