我想使用for循环来避免重复的ID，但我无法摆脱循环

Question

I wrote the following code to avoid duplicate ID, but I can not get out of the for loop.

print $someid;

is Keep displaying 0.

<?php
        for (; ; ) {
            $sql = "SELECT COUNT * FROM user WHERE id = :id";
            $id =  sha1(uniqid(mt_rand(), true));
            $idcheck = $connect -> prepare($sql);
            $idcheck->bindParam(':id', $id, PDO::PARAM_STR);
            $idcheck -> execute();
            $someid = $idcheck -> rowCount();
            print $someid;
            if ($someid = 0) {
                break;
            } 
        }
?>

How can I get out of the loop only if there are no duplicates?

Answer 1

The problem is in the if condition, you are not comparing the value with 0 instead assigning to it, Do this way,

<?php
        for (; ; ) {
            $sql = "SELECT COUNT * FROM user WHERE id = :id";
            $id =  sha1(uniqid(mt_rand(), true));
            $idcheck = $connect -> prepare($sql);
            $idcheck->bindParam(':id', $id, PDO::PARAM_STR);
            $idcheck -> execute();
            $someid = $idcheck -> rowCount();
            print $someid;
            if ($someid == 0) {
                break;
            } 
        }
?>