php-doc-en/functions/crack.xml

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 <reference id="ref.crack">
  <title>Crack functions</title>
  <titleabbrev>Crack functions</titleabbrev>

  <partintro>
   <simpara>
    These functions allow you to use the CrackLib library to test the 'strength'
    of a password.  In order to use these functions, you must compile PHP with
    Crack support by using the <option role="configure">--with-crack[=DIR]</option>
    option.
   </simpara>
   <simpara>
    More information regarding CrackLib along with the library can be found at
    <ulink url="&url.crack;">&url.crack;</ulink>.
   </simpara>
   <simpara>
    Cracklib is useful in testing the 'strength' of a password that checks
    length, use of upper and lower case and a check against the specified CrackLib
    dictionary.  CrackLib will also give helpful diagnostic messages that will
    help 'strengthen' the password.
    </simpara>
    <para>
     This example shows how to open a CrackLib dictionary, test a given password,
     retrieve any diagnostic messages, and close the dictionary.
     <example>
      <title>CrackLib example</title>
       <programlisting role="php">
<![CDATA[
<?php
// Open CrackLib Dictionary
$dictionary = crack_opendict('/usr/local/lib/pw_dict')
     or die('Unable to open CrackLib dictionary');

// Perform password check
$check = crack_check($dictionary, 'gx9A2s0x');

// Retrieve messages
$diag = crack_getlastmessage();
echo $diag; // 'strong password'

// Close dictionary
crack_closedict($dictionary);
?>
]]>
       </programlisting>
     </example>
    </para>
    <note>
     <para>
      If <function>crack_check</function> returns &true;,
      <function>crack_getlastmessage</function> will return 'strong password'.
     </para>
    </note>
  </partintro>


  <refentry id="function.crack-opendict">
   <refnamediv>
    <refname>crack_opendict</refname>
    <refpurpose>Opens a new CrackLib dictionary</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>resource</type><methodname>crack_opendict</methodname>
       <methodparam><type>string</type><parameter>dictionary</parameter></methodparam>
     </methodsynopsis>
    <para> 
     Returns a dictionary resource identifier on success, or &false; on failure.
    </para>
     &warn.experimental.func;
    <para>
     <function>crack_opendict</function> opens the specified CrackLib 
     <parameter>dictionary</parameter> for use with
     <function>crack_check</function>.
    </para>
    <note>
     <para>
      Only one dictionary may be open at a time.
     </para>
    </note>
    <para>
     See also: <function>crack_check</function>, and
     <function>crack_closedict</function>.
    </para>
   </refsect1>
  </refentry>
	
  <refentry id="function.crack-closedict">
   <refnamediv>
    <refname>crack_closedict</refname>
    <refpurpose>Closes an open CrackLib dictionary </refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>crack_closedict</methodname>
      <methodparam choice="opt"><type>resource</type><parameter>dictionary</parameter></methodparam>
     </methodsynopsis>
    <para>
     &return.success;
    </para>
     &warn.experimental.func;
    <para>
     <function>crack_closedict</function> closes the specified
     <parameter>dictionary</parameter> identifier.  If
     <parameter>dictionary</parameter> is not specified, the current
     dictionary is closed.
    </para>
   </refsect1>
  </refentry>
	
  <refentry id="function.crack-check">
   <refnamediv>
    <refname>crack_check</refname>
    <refpurpose>Performs an obscure check with the given password</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>bool</type><methodname>crack_check</methodname>
      <methodparam choice="opt"><type>resource</type><parameter>dictionary</parameter></methodparam>
      <methodparam><type>string</type><parameter>password</parameter></methodparam>
     </methodsynopsis>
    <para> 
     Returns &true; if <parameter>password</parameter> is strong, or &false; otherwise.
    </para>
     &warn.experimental.func;
    <para>
     <function>crack_check</function> performs an obscure check with the given
     <parameter>password</parameter> on the specified <parameter>dictionary
     </parameter>.  If <parameter>dictionary</parameter> is not specified,
     the last opened dictionary is used.
    </para>
   </refsect1>
  </refentry>
	
  <refentry id="function.crack-getlastmessage">
   <refnamediv>
    <refname>crack_getlastmessage</refname>
    <refpurpose>Returns the message from the last obscure check</refpurpose>
   </refnamediv>
   <refsect1>
    <title>Description</title>
     <methodsynopsis>
      <type>string</type><methodname>crack_getlastmessage</methodname>
      <void/>
     </methodsynopsis>
     &warn.experimental.func;
    <para>
     <function>crack_getlastmessage</function> returns the message from the
     last obscure check.
    </para>
   </refsect1>
  </refentry>
	
 </reference>
 
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