PHP(array with shift, unshift, pop, puch functions)

<?php

$numbers = array(1,2,3,4,5,6);

print_r($numbers);

echo "<br /> <br />";

//shifts first element out of an array

//and returns it.

$a = array_shift($numbers);

echo "a: ". $a. "<br/>";

print_r($numbers);

echo "<br /> <br />";

//prepends an element to an array

//returns the element count.

$b = array_unshift($numbers, 'first');

echo "b: " . $b . "<br />";

print_r($numbers);

echo "<br /> <br />";

echo "<hr/>";

//pops an element out of an array

//and returns it.

$c = array_pop($numbers);

echo "c: " . $c . "<br />";

print_r($numbers);

echo "<br /><br />";

//pushes the element onto the end of an array,

//returns the element count.

$d  = array_push($numbers, "last");

echo "d:" . $d ."<br />";

print_r($numbers);

echo "<br /> <br />";

?>

//RESULT ON BROWSER

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )

a: 1
Array ( [0] => 2 [1] => 3 [2] => 4 [3] => 5 [4] => 6 )

b: 6
Array ( [0] => first [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 ) 

---

c: 6
Array ( [0] => first [1] => 2 [2] => 3 [3] => 4 [4] => 5 )

d:6
Array ( [0] => first [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => last )