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Simple PHP function to generate alphanumeric password string

Tuesday, April 1, 2014

Here is a simple PHP function, that can be used for generating strong passwords.

  • # The generated string will contain Numbers, Special characters and Upper & Lower case alphabets
  • # You can specify the number of characters in the generated string
  • # If number of characters is not given, the function will return an alphanumeric string having 7 characters with all type of characters given above
  • # Function call with string length generatePasswordString(8)
  • # Function call with out string length generatePasswordString()


function generatePasswordString($nLength=0){

//few letters are avoided as it may confuse users

$arrStr= array();

if( !$nLength ){





for($i=1;$i<$nLength; $i++){


if( $randval > 0 && $randval <= 10 ) $arrStr[$i]=$cLetterArray[rand(0,17)];
elseif( $randval > 10 && $randval <= 20 ) $arrStr[$i]=$sLetterArray[rand(0,17)];
elseif( $randval > 20 && $randval <= 30 ) $arrStr[$i]=$spCharArray[rand(0,7)];
else $arrStr[$i]=rand(1,9);



return $strAlphaNumeric;

// how to call the function
echo "Password string :: ".generatePasswordString(10);

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