我有一个生成随机字符串的函数，我希望它生成超过1行的随机字符串

I have a Function to generate random string ,it produce more than 1 random string ,but how to separate them

    Function generatorstring($count) {

    $karakter = '0123456789abcdefghijklmnopqrstuvwxyz';
    $length = 7;
    $randomString = '';

    for ($i=0; $i <$count ; $i++) { 

        for ($ia = 0; $ia < $length; $ia++) {
            $randomString .= $karakter[rand(0, strlen($karakter) - 1)];
        }

    }

    return $randomString ;
}
echo generatorstring(3);

I expected result like this

'As6s8Xs',
'zE71jnM', 
'ak9a71b', 

But, its only produce 1 line of random string.

Well, right off the bat, your biggest problem is that you have a for loop using a variable that is inside a for loop using the same variable.

First for loop establishes $i as 0, incrementing 1. Second for loop (inside) overwrites $i as 0 and increments until $i equals $length. $i is now 7. Outer for loop sees $i is 7, which is greater than $count (3), therefore the outer for loop breaks.

for($i=0; $i < $count; $i++) {
   for($ia=0; $ia < $length; $ia++){
      //do something
   }
}

Also note, this is ugly, and it is better, as @dWinder mentioned, to put your inner for loop in its own function.

You should separate your code for function creating random string and then call it 3 times.

Separating code to small function doing simple action is basic for good practice programming.

Consider:

function generatorstring($length = 7){
    $karakter = '0123456789abcdefghijklmnopqrstuvwxyz';
    $randomString = '';
    for ($i = 0; $i < $length; $i++) {
        $randomString .= $karakter[rand(0, strlen($karakter) - 1)];
    }
    return $randomString;
}

And now just call it as:

for ($i = 0; $i < 3; $i++) 
    $res[] = generatorstring();

Or create a function who create array of random strings as:

function createRandomStringArray($count) {
    for ($i = 0; $i < $count; $i++) 
        $res[] = generatorstring();
    return $res;
}

And then you can print the $res array using print_r or another loop