PHP Compute Password Strength

The following PHP code is used to test the strength of a given password, with a maximum strength of 100 /** * * @param String $string * @return Float * * Returns a float between 0 and 100. The Closer is the * The stronger password is; Further from the weaker the password is. */ function Password_strength ($string) { $h = 0; $size = strlen ($string); foreach (Count_chars ($string, 1) as $v) { $p = $v/$size; $h-= $p * LOG ($p)/log (2); } $strength = ($h/4) * 100; if ($strength > 100) { $strength = 100; } return $strength; } Var_dump (Password_strength ("Correct Horse Battery Staple")); echo " "; Var_dump (Password_strength ("Super Monkey Ball")); echo " "; Var_dump (Password_strength ("tr0ub4dor&3")); echo " "; Var_dump (Password_strength ("abc123")); echo " "; Var_dump (Password_strength ("Sweet")); Copy Code

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