php-doc-en/reference/password/constants.xml

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<appendix xml:id="password.constants" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.constants;
 &extension.constants.core;

 <para>
  <variablelist>
   <varlistentry xml:id="constant.password-bcrypt">
    <term>
     <constant>PASSWORD_BCRYPT</constant>
     (<type>integer</type>)
    </term>
    <listitem>
     <para>
      <constant>PASSWORD_BCRYPT</constant> is used to create new password
      hashes using the <constant>CRYPT_BLOWFISH</constant> algorithm.
     </para>
     <para>
      This will always result in a hash using the "$2y$" crypt format, 
      which is always 60 characters wide.
     </para>
     <para>
      Supported Options:
     </para>
     <itemizedlist>
      <listitem>
       <para>
        <literal>salt</literal> (<type>string</type>) - to manually provide a salt to use when hashing the password.
        Note that this will override and prevent a salt from being automatically generated.
       </para>
       <para>
        If omitted, a random salt will be generated by <function>password_hash</function> for
        each password hashed. This is the intended mode of operation
        and as of PHP 7.0.0 the salt option has been deprecated.
       </para>
      </listitem>
      <listitem>
       <para>
        <literal>cost</literal> (<type>integer</type>) - which denotes the algorithmic cost that 
        should be used. Examples of these values can be found on the <function>crypt</function> 
        page.
       </para>
       <para>
        If omitted, a default value of <literal>10</literal> will be used. This is a good
        baseline cost, but you may want to consider increasing it depending on your hardware.
       </para>
      </listitem>
     </itemizedlist>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.password-argon2i">
    <term>
     <constant>PASSWORD_ARGON2I</constant>
     (<type>integer</type>)
    </term>
    <listitem>
     <para>
      <constant>PASSWORD_ARGON2I</constant> is used to create new password
      hashes using the Argon2i algorithm.
     </para>
     <para>
      Supported Options:
     </para>
     <itemizedlist>
      <listitem>
       <para>
        <literal>memory_cost</literal> (<type>integer</type>) - Maximum memory (in bytes) that may 
        be used to compute the Argon2 hash. Defaults to <constant>PASSWORD_ARGON2_DEFAULT_MEMORY_COST</constant>.
       </para>
      </listitem>
      <listitem>
       <para>
        <literal>time_cost</literal> (<type>integer</type>) - Maximum amount of time it may 
        take to compute the Argon2 hash. Defaults to <constant>PASSWORD_ARGON2_DEFAULT_TIME_COST</constant>.
       </para>
      </listitem>
      <listitem>
       <para>
        <literal>threads</literal> (<type>integer</type>) - Number of threads to use for computing 
        the Argon2 hash. Defaults to <constant>PASSWORD_ARGON2_DEFAULT_THREADS</constant>.
       </para>
      </listitem>
     </itemizedlist>
     <para>
      Available as of PHP 7.2.0.
     </para>
    </listitem>
   </varlistentry> 
   <varlistentry xml:id="constant.password-argon2id">
    <term>
     <constant>PASSWORD_ARGON2ID</constant>
     (<type>integer</type>)
    </term>
    <listitem>
     <para>
      <constant>PASSWORD_ARGON2ID</constant> is used to create new password
      hashes using the Argon2id algorithm. It supports the same options as
      <link linkend="constant.password-argon2i"><constant>PASSWORD_ARGON2I</constant></link>.
     </para>
     <para>
      Available as of PHP 7.3.0.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.password-argon2-default-memory-cost">
    <term>
     <constant>PASSWORD_ARGON2_DEFAULT_MEMORY_COST</constant>
     (<type>integer</type>)
    </term>
    <listitem>
     <para>
      Default amount of memory in bytes that Argon2lib will use while trying to 
      compute a hash.
     </para>
     <para>
      Available as of PHP 7.2.0.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.password-argon2-default-time-cost">
    <term>
     <constant>PASSWORD_ARGON2_DEFAULT_TIME_COST</constant>
     (<type>integer</type>)
    </term>
    <listitem>
     <para>
      Default amount of time that Argon2lib will spend trying to compute a hash.
     </para>
     <para>
      Available as of PHP 7.2.0.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.password-argon2-default-threads">
    <term>
     <constant>PASSWORD_ARGON2_DEFAULT_THREADS</constant>
     (<type>integer</type>)
    </term>
    <listitem>
     <para>
      Default number of threads that Argon2lib will use.
     </para>
     <para>
      Available as of PHP 7.2.0.
     </para>
    </listitem>
   </varlistentry>
   <varlistentry xml:id="constant.password-default">
    <term>
     <constant>PASSWORD_DEFAULT</constant>
     (<type>integer</type>)
    </term>
    <listitem>
     <para>
      The default algorithm to use for hashing if no algorithm is provided.
      This may change in newer PHP releases when newer, stronger hashing
      algorithms are supported.
     </para>
     <para>
      It is worth noting that over time this constant can (and likely will)
      change. Therefore you should be aware that the length of the resulting
      hash can change. Therefore, if you use <constant>PASSWORD_DEFAULT</constant>
      you should store the resulting hash in a way that can store more than 60
      characters (255 is the recomended width).
     </para>
     <para>
      Values for this constant:
     </para>
     <itemizedlist>
      <listitem>
       <simpara>
        PHP 5.5.0 - <constant>PASSWORD_BCRYPT</constant>
       </simpara>
      </listitem>
     </itemizedlist>
    </listitem>
   </varlistentry>
  </variablelist>
 </para>
</appendix>

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