php - limit character string for loop

Question

I have this in PHP:

$_chars = "0123456789ZXCVBNMASDFGHJKLQWERTYUIOP";

for($l = 0; $l<4; $l++){
    $temp = str_shuffle($_chars);
    $_charcode .= $temp;
}

I want it to only generate 4 characters. Currently It's generating 6. I've tried editing $l but it doesn't change anything.

str_shuffle returns the whole string, not just one character. You're actually getting a 144 character (4 * 36) string. — gen_Eric
– gen_Eric, Commented Oct 10, 2013 at 18:06

bwoebi · Accepted Answer · 2013-10-10 18:07:01Z

2

Docs (http://php.net/str_shuffle) state:

str_shuffle() shuffles a string. One permutation of all possible is created.

it should actually generate 4 * strlen($_chars) characters…

I assume you want:

$_charcode .= $temp[0]; // only one character

answered Oct 10, 2013 at 18:07

bwoebi

23.8k5 gold badges64 silver badges81 bronze badges

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

Comments

Amal · Accepted Answer · 2013-10-10 18:06:54Z

1

From the documentation:

str_shuffle() shuffles a string. One permutation of all possible is created.

You'll want to retrieve just one character from the shuffled string:

$_charcode .= $temp[0];

So, the code should look like:

$_chars = "0123456789ZXCVBNMASDFGHJKLQWERTYUIOP";

$_charcode = ''; // initialize the variable with an empty string
for($l = 0; $l<4; $l++){
    $temp = str_shuffle($_chars);
    $_charcode .= $temp[0];
}
echo $_charcode;

Output(example):

8VG6

Demo!

answered Oct 10, 2013 at 18:06

Amal

76.8k18 gold badges134 silver badges155 bronze badges

3 Comments

bwoebi Over a year ago

lol :o) You edited your question to reflect the same content as I have (and a little bit more)

Amal Over a year ago

@bwoebi: Nope, I didn't. I just added the documentation bit (I can't create one excerpt of my own). Also, look at the timestamp of the answers.

bwoebi Over a year ago

I seemed to me this way; sorry then ;-) The timestamp has a difference of 7 seconds, but you had also edited in the five minutes after creation while I hadn't…

Collectives™ on Stack Overflow

php - limit character string for loop

2 Answers 2

Comments

3 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

3 Comments

Your Answer

Sign up or log in

Post as a guest

Related