Causing Issues in making random string using symbol defined

Question

I want to generate a random string of 50 characters string using Letters, Numbers and Special Symbols.

Below Code is working Fine for me.

But the issue is that if I add Special Symbol <

I does not work as it should be

Kindly help.

<?php
$complete_string = NULL;
$generated_string = NULL;
$generated_string_length = 50;

$lower_case_string = 'abcdefghijklmnopqrstuvwxyz';
$upper_case_string = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
$numbers_string = '0123456789';
$special_symbols_string = ',./?;:"[]{}+=-_)(*&^%$#@!~`>'; // All Special Symbols without <

$complete_string = $complete_string.$lower_case_string.$upper_case_string.$numbers_string.$special_symbols_string;

$generated_string = substr(str_shuffle(str_repeat($complete_string, ceil($generated_string_length/strlen($complete_string)) )),1,$generated_string_length);

echo $generated_string;
?>

This code works both with and without '<'. Could you explain the problem? — vstelmakh
– vstelmakh, Commented Oct 4, 2017 at 8:01
Above Code is working fine as it generate 50 length random string, but if add special symbol < , it does not work then. — Jone Doe
– Jone Doe, Commented Oct 4, 2017 at 8:06
I tried to execute this on php 5.6 and php 7.1 with '<', every time I received a string, sometimes containing '<', with length of 50 symbols — vstelmakh
– vstelmakh, Commented Oct 4, 2017 at 8:16
You can't recieve all symbols in your result every time, because your $complete_string is 91 symbols length, then you shuffle it and crop to 50 symbols. So you always loose 41 random symbol. — vstelmakh
– vstelmakh, Commented Oct 4, 2017 at 8:36

Ravi Chauhan · Accepted Answer · 2017-10-04 07:46:48Z

1

function randstr ($len=10, $abc="abcdefghijklmnopqrstuvwxyz,./?;:[]{}+=-_)(*&^%$#@!~`>") {
    $letters = str_split($abc);
    $str = "";
    for ($i=0; $i<=$len; $i++) {
        $str .= $letters[rand(0, count($letters)-1)];
    };
    return $str;
};

echo randstr(50);

answered Oct 4, 2017 at 7:46

Ravi Chauhan

1,53513 silver badges30 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Ravi Chauhan Over a year ago

$abc = "dsadsad&*^%*^%^" as set your code as you want in random strings

Collectives™ on Stack Overflow

Causing Issues in making random string using symbol defined

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related