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@ 2015-02-15T08:49:32Z

<?php

$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 . "\n";

Output
Performance
VLD
References
Branches

password_hash: documentation ( source)
microtime: documentation ( source)

preferences:dark modelive preview

37.25 ms | 402 KiB | 5 Q