Snippets Algorithms
Algorithms
Paswoord generator
by: jayon crow
|
March 21, 2007
Version: 2.0
Type: Function
Category: Algorithms
License: GNU General Public License
Description: Very simple script which generates an 8 digit paswoord cinsisting of letters and numbers and capital letters
/* Author: J.B.Lamer, Date: 20070321
*
* generates a password of length between $minlen and $maxlen
* This calls getPossibleString() (below) that returns a string of possible
* characters for the password
* if $maxlen is null (or out of range) than $maxlen will equal minlen
* if $minlen is out of range than it will equal 8 (the range is between 4 and 20)
* $use_upper, $str_include, and $str_exclude are used to build possible string
* see getPossibleString()
*
* a good way to call is $p = generate_password(6,10,true,'','0OQI1lqg');
* so you exclude zero,'oh', and Q; capital i, one, and lower L; q and g; and whatever
* else you think look the same
* That will generate a password of length 6 to 10 that have capital or lower case letters
*/
function generate_password( $minlen=8, $maxlen=null, $use_upper=false, $str_include=null, $str_exclude=null )
{
if ( !(($minlen = intval($minlen)) >= 4 && $minlen <= 20) )
{ $minlen = 8; }
if ( is_null($maxlen)
|| !(($maxlen = intval($maxlen)) >= 4 && $maxlen <= 20) )
{ $maxlen = $minlen; }
$password = '';
$possible = getPossibleString( $use_upper, $str_include, $str_exclude );
$p_len = strlen($possible);
// care about repeating? make proper checks if you do
$len = mt_rand($minlen,$maxlen);
for ( $i=0; $i < $len; $i++ )
{
$password .= substr( $possible, mt_rand(0, $p_len), 1 );
}
return $password;
}
/* Author: J.B.Lamer, Date: 20070321
*
* generate a string of all possible chars that can be used for password
* automatically, there is 0-9 and a-z
* $use_upper set to true includes A-Z
* $str_include is a string of any extra characters to include
* $str_exclude is a string of any characters to exclude.. this is called last
*/
function getPossibleString( $use_upper=false, $str_include=null, $str_exclude=null )
{
$possible = '';
for ( $i=ord('0'); $i <= ord('9'); $i++ )
{ $possible .= chr($i); }
for ( $i=ord('a'); $i <= ord('z'); $i++ )
{ $possible .= chr($i); }
for ( $i=ord('A'); $use_upper && $i <= ord('Z'); $i++ )
{ $possible .= chr($i); }
if ( !is_null( $str_include ) && strlen($str_include) > 0 )
{
$str_include = strval($str_include);
for ( $i=0; $i < strlen($str_include); $i++ )
{
if ( false === strpos( $possible, $str_include[$i] ) )
{ $possible .= $str_include[$i]; }
}
}
if ( !is_null( $str_exclude ) && strlen($str_exclude) > 0 )
{
$str_exclude = strval($str_exclude);
for ( $i=0; $i < strlen($str_exclude); $i++ )
{
if ( false !== ($pos = strpos($possible, $str_exclude[$i])) )
{
$hold = '';
$hold .= substr($possible,0,$pos);
if ( $pos+1 < strlen($possible) )
{ $hold .= substr($possible,$pos+1); }
$possible = $hold;
}
}
}
return $possible;
}
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