Hands on with Node.js - Preface - PHP Example

<?php

# Example 1
echo "hello\n";
sleep(2);  # sleeps for 2 seconds
echo "world\n";

# Example 2
$contents = file_get_contents('one.txt');
if ( $contents === false ) {
	echo "error occured\n";
	exit(-1);
} else {
	echo "contents: $contents\n";
}

# Example 3
$one = file_get_contents('one.txt');
$two = file_get_contents('two.txt');
if ( $one === false || $two === false ) {
	echo "error occured\n";
	exit(-1);
} else {
	echo "one: $one\n";
	echo "two: $two\n";
}

# Example 4
# Not possible in PHP