Generating a random password in php

I am trying to generate a random password in php.
I found couple of solution for this .

solution 01
use strlen instead of count, because count on a string is always 1

 
<?php
function randomPassword() {
    $alphabet = "abcdefghijklmnopqrstuwxyzABCDEFGHIJKLMNOPQRSTUWXYZ0123456789";
    $pass = array(); //remember to declare $pass as an array
    $alphaLength = strlen($alphabet) - 1; //put the length -1 in cache
    for ($i = 0; $i < 8; $i++) {
        $n = rand(0, $alphaLength);
        $pass[] = $alphabet[$n];
    }
    return implode($pass); //turn the array into a string
}
echo randomPassword();?>

Solution 02

<?php

  function generatePassword ($length = 8)
  {

    // start with a blank password
    $password = "";

    // define possible characters - any character in this string can be
    // picked for use in the password, so if you want to put vowels back in
    // or add special characters such as exclamation marks, this is where
    // you should do it
    $possible = "2346789bcdfghjkmnpqrtvwxyzBCDFGHJKLMNPQRTVWXYZ";

    // we refer to the length of $possible a few times, so let's grab it now
    $maxlength = strlen($possible);
  
    // check for length overflow and truncate if necessary
    if ($length > $maxlength) {
      $length = $maxlength;
    }
	
    // set up a counter for how many characters are in the password so far
    $i = 0; 
    
    // add random characters to $password until $length is reached
    while ($i < $length) { 

      // pick a random character from the possible ones
      $char = substr($possible, mt_rand(0, $maxlength-1), 1);
        
      // have we already used this character in $password?
      if (!strstr($password, $char)) { 
        // no, so it's OK to add it onto the end of whatever we've already got...
        $password .= $char;
        // ... and increase the counter by one
        $i++;
      }

    }

    // done!
    return $password;

  }

?>

solution 03

<?php
 
function generatePassword($length=9, $strength=0) {
    $vowels = 'aeuy';
    $consonants = 'bdghjmnpqrstvz';
    if ($strength & 1) {
        $consonants .= 'BDGHJLMNPQRSTVWXZ';
    }
    if ($strength & 2) {
        $vowels .= "AEUY";
    }
    if ($strength & 4) {
        $consonants .= '23456789';
    }
    if ($strength & 8) {
        $consonants .= '@#$%';
    }
 
    $password = '';
    $alt = time() % 2;
    for ($i = 0; $i < $length; $i++) {
        if ($alt == 1) {
            $password .= $consonants[(rand() % strlen($consonants))];
            $alt = 0;
        } else {
            $password .= $vowels[(rand() % strlen($vowels))];
            $alt = 1;
        }
    }
    return $password;
}
 
?>