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Simple function to generate the password, given a length.

    /* Defining the function */
    function pwgen ($len) {
        /* Variables declaration */
        $pw = "";
        $wordBook = array ();
        /* Fill array with printable english characters */
        for ( $wb=33; $wb<127; $wb++ ) {
            array_push ( $wordBook, $wb );
        }
        shuffle ( $wordBook ); // Shake
        $pass = array_rand ( $wordBook , $len ); // Slice a part
        shuffle ( $pass ); // Shake again
        /* Save the array into variable */
        foreach ( $pass as $i => $wb_index ) {
            $pw .= chr ( $wordBook [$wb_index] );
        }
        return $pw;
    }
    /* Calling the function and passing 10 as length */
    print pwgen(10);
code type: 
php