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bool password_needs_rehash ( string $hash , int $algo [, array $options ] )

<?php

$password = 'rasmuslerdorf';
$hash = '$2y$10$YCFsG6elYca568hBi2pZ0.3LDL5wjgxct1N8w/oLR/jfHsiQwCqTS';

// The cost parameter can be adjusted when hardware performance improves
$options = array('cost' => 11);

// Verify the stored hash against the plain text password
if (password_verify($password, $hash)) {
    // Check if there are newer available hashing algorithms
    // or if the cost has changed
    if (password_needs_rehash($hash, PASSWORD_DEFAULT, $options)) {
        // If so, create a new hash and replace the old one
        $newHash = password_hash($password, PASSWORD_DEFAULT, $options);
    }

    // Log the user in
}
?>