编写一个循环，用一些随机数填充数组

I have previously written the code below with a loop to echo the keys of a two dimensional array.

$coordinates = array(
   "x"=>array(1,2,3),
   "y"=>array(4,5,6)
);

foreach($coordinates as $xycoordinates => $position){
  echo "Position: ". $xycoordinates."<br/>";
  foreach($position as $key => $value){
     echo $value;
  }
  echo "<br /><br />";
}

I'm trying to populate the array with some random numbers. Each attempt keeps referencing 'array push', which isn't a loop (or can array push be used in a loop?).

Explanation: in code below,

$Anynumber = 10;

this statement is simply creating a variable i.e. declaring and allocating memory space and also initializing it with value '10' ,

$Array = array();

In this statement, an array is being declared but NOT initialized with any value, in php Array can increase and decrease their size as per requirement,

for($index=0 ; $index<$Anynumber; $index++)

this is simple 'for' loop, from 0 to 9 as condition is " less than $Anynumber which is 10,

$Array[] = $index;

This statement is simply assigning $index's value which is increased at each iteration of 'for' loop,

e.g.

$Array[] = $index; // at first iteraion its like this $Array[0] = 0;

$Array[] = $index; // at second iteraion its like this $Array[1] = 1;

$Array[] = $index; // at third iteraion its like this $Array[2] = 2;

and so on.

I hope this cleared any confusion you had.

complete code:

$Anynumber = 10;
$Array = array();
for($index=0 ; $index<$Anynumber ; $index++){

$Array[] = $index;

}

I would do something like:

$size = 3;

$coordinates = array(
   "x"=>array(),
   "y"=>array()
);

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

  array_push($coordinates["x"], rand(1,10));
  array_push($coordinates["y"], rand(1,10));
}