First and last char is alfabetic, A-Za-z.
This is because I have seen websites that will demand this.

Always is generated 1 Upper, 1 Lower, 1 Number and 1 Symbol.
The remaining 4 chars are of any type.

This gives a password that is reasonable secure.
I use this generator for my own passwords.

To remember passwords I use Last Pass https://www.lastpass.com/

<?php

// The Characters
// 8 chars excluded: "&'<>\` and space
$symbol = '!#$%()*+,-./:;=?@[]^_{|}~';  // 25 chars
$number = '0123456789';                 // 10 chars
$upper  = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; // 26 chars
$lower  = 'abcdefghijklmnopqrstuvwxyz'; // 26 chars
$alfa   = $upper.$lower;                // 52 chars
$chars  = $symbol.$number.$upper.$lower;// 87 chars

// Password generator for 10 chars
$pw = '';
$ord = str_shuffle('12345678');
$pw[0] = $alfa[mt_rand(0,51)];
$pw[$ord[0]] = $symbol[mt_rand(0,24)];
$pw[$ord[1]] = $number[mt_rand(0,9)];
$pw[$ord[2]] = $upper[mt_rand(0,25)];
$pw[$ord[3]] = $lower[mt_rand(0,25)];
$pw[$ord[4]] = $chars[mt_rand(0,86)];
$pw[$ord[5]] = $chars[mt_rand(0,86)];
$pw[$ord[6]] = $chars[mt_rand(0,86)];
$pw[$ord[7]] = $chars[mt_rand(0,86)];
$pw[9] = $alfa[mt_rand(0,51)];

// Display result
echo '<p style="font-family:\'Courier New\'">';
echo '1234567890123456';
echo '<br>';
echo $pw;
echo '</p>';

exit();

    I just felt like coming up with something more OOP, and threw this together. Not claiming it's great, just something different. 🙂

    <?php

header('Content-Type: text/plain');
$pwd = new PasswordGenerator(10,12);
echo $pwd->password();

class PasswordGenerator
{
    private $min;
    private $max;
    // edit this for the symbols you want to allow
    private $symbols = array('.', ',', '!', '?', '$', '-', '_', '+', '@', '&', '*');
    private $password;

public function __construct($min=8, $max=10)
{
    if($max < $min or $min < 4) {
        throw new Exception("Invalid min/max password length");
    }
    $this->min = $min;
    $this->max = $max;
    $this->generate();
}

public function generate()
{
    $password = array();
    // make sure we get at least one of each type
    $types = array('int', 'lower', 'upper', 'symbol');
    foreach($types as $type) {
        $password[] = $this->$type();
    }
    // emphasize letters a bit more for the rest
    $types[] = 'lower';
    $types[] = 'upper';
    $length = rand($this->min, $this->max);
    while(count($password) < $length) {
        $type = $types[array_rand($types)];
        $password[] = $this->$type();
    }
    shuffle($password);
    $this->password = implode('', $password);
    return $this->password;
}

public function password()
{
    return $this->password;
}

private function int()
{
    return rand(0, 9);
}

private function lower()
{
    return chr(rand(97, 122));
}

private function upper()
{
    return chr(rand(65, 90));
}

private function symbol()
{
    return $this->symbols[array_rand($this->symbols)];
}
}

      This is a version that is a bit better.

      First and last is alfa, A-Za-z.
      The rest is
      - 2 Upper case
      - 2 Lower case
      - 2 Numbers
      - 2 Symbols

      <?php

// The Characters
// 8 chars excluded: "&'<>\` and space
$symbol = '!#$%()*+,-./:;=?@[]^_{|}~';  // 25 chars
$number = '0123456789';                 // 10 chars
$upper  = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'; // 26 chars
$lower  = 'abcdefghijklmnopqrstuvwxyz'; // 26 chars
$alfa   = $upper.$lower;                // 52 chars

// Password Generator 10 chars
$pw = '';
$ord = str_shuffle('12345678');
$pw[0] = $alfa[mt_rand(0,51)];
$pw[$ord[0]] = $symbol[mt_rand(0,24)];
$pw[$ord[1]] = $symbol[mt_rand(0,24)];
$pw[$ord[2]] = $number[mt_rand(0,9)];
$pw[$ord[3]] = $number[mt_rand(0,9)];
$pw[$ord[4]] = $upper[mt_rand(0,25)];
$pw[$ord[5]] = $upper[mt_rand(0,25)];
$pw[$ord[6]] = $lower[mt_rand(0,25)];
$pw[$ord[7]] = $lower[mt_rand(0,25)];
$pw[9] = $alfa[mt_rand(0,51)];

// Display result
echo '<p style="font-family:\'Courier New\'">';
echo '1234567890123456';
echo '<br>';
echo $pw;
echo '</p>';

exit();
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