<?php
echo "hello world";
print "hello world";
printf("%s", "hello world");
print_r("hello world");
$arr1 = array('a'=>1, 'b'=>2, 'c'=>3);
print_r($arr1);
$a = array ('a' => 'apple', 'b' => 'banana', 'c' => array ('x', 'y', 'z'));
print_r ($a);