PHP array adding or pushing elements or parameters

We can add element ( parameters ) to an array at the end. We can also add a set of elements to the array. Any time we can check the number of elements in an array by using array count command. 
We will first create an array like this

$stack = array (1, 2);
array_push ($stack,3,4,5,6);  // we are adding four more elements to the array
echo count($stack);
This will display total number of elements inside the array , that is 6 here.

Create an array with three elements and then add two more elements to it. Check the keys also.
while (list ($key, $val) = each ($input)) {
echo "$key -> $val <br>";
Output of above code is here
0 -> a 
1 -> b 
2 -> c 
3 -> d 
4 -> e 
5 -> f 
Adding 1 to 10 ( or 1 to 100 ) numbers into an array
while (list ($key, $val) = each ($input)) {
echo "$key -> $val <br>";
We have seen how elements are added to an array. But we may require to add two arrays.
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