how to get array random from object? - php

Question

I tried to make array from random item object to get 2 items. I used array_rand() but the output is array_rand() expects parameter 1 to be array, integer given and Trying to get property of non-object
My code is for get random item is :
$k=2;
$centroid = array();
for($i=0; $i<$k; $i++){
$centroid[] = new DataSet($table[array_rand($i)]->sig_class_id,$table[array_rand($i)]->sig_priority);
}
Get data from
$query = mysqli_query($conn,"SELECT sig_class_id, sig_priority FROM coba");
$table=array();
while ($row = mysqli_fetch_object($query)) {
$table[] = new DataSet($row->sig_class_id, $row->sig_priority);
}
and class DataSet is
class DataSet{
public $sig_class_id;
public $sig_priority;
function __construct($sig_class_id, $sig_priority){
$this->sig_class_id = $sig_class_id;
$this->sig_priority = $sig_priority;
}
}
any thought?

Answer 1

I think you are in wrong logic. Instead, you should get a random number and get random number related array. Try below code!
$random = 0;
$centroid = array();
for($i=0; $i=2; $i++){
$random = rand();
$centroid[] = new DataSet($table[$random]->sig_class_id,$table[$random]->sig_priority);
}
== Edit 1 ==
Tip 1 : You can also use mt_rand() function produces a better random value, and is 4 times faster than rand().
Tip 2 : If you want a random integer between 10 and 100 (inclusive), use rand (10,100).