Verifying Passwords with password_verify()

Verify login passwords against hashes created by password_hash rather than rehashing for equality. The examples separate the essential operation from the conditions a production implementation must enforce.

What It Does

Verify login passwords against hashes created by password_hash rather than rehashing for equality.

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

This scenario applies the exact rule described in the guide, with controlled sample values.

<?php
$stored = password_hash("secret passphrase", PASSWORD_DEFAULT);
var_export(password_verify("secret passphrase",$stored));

Example 2: Alternative or Failure Case

This scenario applies the exact rule described in the guide, with controlled sample values.

<?php
$stored = password_hash("Known Correct", PASSWORD_DEFAULT);
var_export(password_verify("Known Incorrect",$stored));

Practical Example: Applying the Rule

This scenario applies the exact rule described in the guide, with controlled sample values.

<?php
$hash = password_hash("one-time demonstration", PASSWORD_DEFAULT);
if (!password_verify("one-time demonstration",$hash)) throw new LogicException("Verification error"); echo password_get_info($hash)["algoName"];

Important Behavior and Edge Cases

password_hash uses random salts, so two freshly generated hashes must not be compared for equality.

Comparison with Related Functions or Patterns

Common Beginner Mistakes

Key Takeaways

• Verify login passwords against hashes created by password_hash rather than rehashing for equality.
• password_hash uses random salts, so two freshly generated hashes must not be compared for equality.
• password_get_info inspects the algorithm of a saved 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.