php - Im trying to generate a unique hash for all the users -


i'm trying generate unique hash users in database; here code:

<?php include("php/connect.php");   $sql = "select id user";   while ($id = mysqli_fetch_assoc(mysqli_query($conn, $sql))) {      $new_hash = md5(uniqid(rand(), true));      $sql2 = "insert user (hash) value ('$new_hash') id = $id['id']";     mysqli_query($conn, $sql2);   }  ?>

every time run it, following error:

fatal error: maximum execution time of 30 seconds exceeded in

regarding query:

$sql2 = "insert user (hash) value ('$new_hash') id = $id['id']";

insert doesn't use where clause, update does, insert ... on duplicate key update.

however, don't know why you're wanting that. using column set auto_increment should ample have unique id.

yet, if want do, need use 1 of methods shown above.

i.e.:

if(!$sql2){     echo "error: " . mysqli_error($conn);  }

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