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string password_hash ( string $password , int $algo [, array $options ] )

<?php
/**
 * We want to hash the password using the default algorithm
 * Currently, this is BCRYPT, which will produce a 60-character result.
 *
 * Note that the default algorithm may change over time,
 * so the storage space should be able to accommodate more than 60 characters (255 characters is good).
 */
echo password_hash("rasmuslerdorf", PASSWORD_DEFAULT);
?>

$2y$10$.vGA1O9wmRjrwAVXD98HNOgsNpDczlqm3Jq7KnEd1rVAGv3Fykk1a

<?php
/**
 * In this case, we increase the cost for BCRYPT to 12.
 * Note that this will always produce a 60-character result.
 */
$options = [
    'cost' => 12,
];
echo password_hash("rasmuslerdorf", PASSWORD_BCRYPT, $options);
?>

$2y$12$QjSH496pcT5CEbzjD/vtVeH03tfHKFy36d4J0Ltp3lRtee9HDxY3K

<?php
/**
 * Note that the salt here is randomly generated.
 * Never use a fixed salt or one that is not randomly generated.
 *
 * In most cases, let password_hash generate the random salt for you.
 */
$options = [
    'cost' => 11,
    'salt' => mcrypt_create_iv(22, MCRYPT_DEV_URANDOM),
];
echo password_hash("rasmuslerdorf", PASSWORD_BCRYPT, $options);
?>

$2y$11$q5MkhSBtlsJcNEVsYh64a.aCluzHnGog7TQAKVmQwO9C8xb.t89F.

<?php
/**
 * This example benchmarks the server to determine the highest cost
 * that can be set without significantly slowing down the server.
 * 8-10 is a good baseline, and the higher the better, depending on server performance.
 */
$timeTarget = 0.05; // 50 milliseconds 

$cost = 8;
do {
    $cost++;
    $start = microtime(true);
    password_hash("test", PASSWORD_BCRYPT, ["cost" => $cost]);
    $end = microtime(true);
} while (($end - $start) < $timeTarget);

echo "Optimal cost: " . $cost;
?>

Optimal cost: 10

/*
 * The target for the following code is ≤ 50 milliseconds.
 * Suitable for system processing interactive logins.
 */
$timeTarget = 0.05; // 50 milliseconds

$cost = 8;
do {
    $cost++;
    $start = microtime(true);
    password_hash("test", PASSWORD_BCRYPT, ["cost" => $cost]);
    $end = microtime(true);
} while (($end - $start) < $timeTarget);

echo "Appropriate Cost Found: " . $cost;
?>

Appropriate Cost Found: 10

<?php
echo 'Argon2 hash: ' . password_hash('rasmuslerdorf', PASSWORD_ARGON2I);
?>

Argon2 hash: $argon2i$v=19$m=1024,t=2,p=2$YzJBSzV4TUhkMzc3d3laeg$zqU/1IN0/AogfP4cmSJI1vc8lpXRW9/S0sYY2i2jHT0