Insert/update data to database from list randomly - php

Question

So I have this db with a table called users.
In here is column called work, which is currently empty for all users. I've made a list containing many job-titles, and now I want this to be added into the users table under work column.
I figured I'd do something with a array like this:
$input = array("worktitle1", "worktitle2", "worktitle3");
$rand_keys = array_rand($input, 1);
and then update rand_keys in a simple query:
$mysqli->query('UPDATE users SET work = '.$rand_keys.'');
However, when I did that, only a number value was inserted and it was the same for all of the xx users I haven in the db.
How can I fix so that it insert a random worktitle for every single row? And not the same worktitle for every users. I thought about doing rand() in the query, but am unsure of this works
BONUS QUESTION: If I want my array_rand to prioritise some worktitles (so in the db a specific worktitle will show 10% more times than others), how can I do that?

Answer 1

I am assuming that you have for loop or while or some array which you want to loop through and insert the dummy data in database table.
I think its because you have used array_rand before the for loop and then using inserting into the database of the random key which you had earlier
Eg:
<?php
$input = array("worktitle1", "worktitle2", "worktitle3");
foreach($somearry as $key => $values){
//Now you need to call the array_rand function
$randomKey = array_rand($input, 1); //This will return only the random key of the array
$randomWork = $input[$randomKey]; //This line will give you the random key value of the input array
//Now write your code *here* to insert this random value ie update query
}
Using while loop as per your request
while(some_condition){
//Now you need to call the array_rand function
$randomKey = array_rand($input, 1); //This will return only the random key of the array
$randomWork = $input[$randomKey]; //This line will give you the random key value of the input array
//Now write your code *here* to insert this random value ie update query
}
Even you can do the following hard coded way.
Note : This is just for the sake of demonstration for the user so that
he can understand it properly.
for($i = 0; $i < 10; $i++){
//Now you need to call the array_rand function
$randomKey = array_rand($input, 1); //This will return only the random key of the array
$randomWork = $input[$randomKey]; //This line will give you the random key value of the input array
//Now write your code *here* to insert this random value ie update query
$mysqli->query("UPDATE users SET work = '$randomWork'");
}

Answer 2

As written, your code selects one title at random and then updates all rows with that title, which is I think what you are saying. You need to loop through all users, select a title, and then set the title "WHERE userid='xxx'" or some other way of selecting specific users.
Weighted randomness. Take you array of titles and add extra entries for the ones you want to weight. If "CEO" is to be 10% more likely to be used, make sure the array has 10 entries of "CEO".