<?php
echo "Hello World\n";

echo "Escaping characters is done \"Like this\".\n";

// You can use variables inside of an echo statement
$foo = "foobar";
$bar = "barbaz";

echo "foo is $foo \n"; // foo is foobar
// Using single quotes will print the variable name, not the value
echo 'foo is $foo '."\n"; // foo is $foo

// If you are not using any other characters, you can just echo variables
echo $foo;          // foobar
echo $foo,$bar,"\n";    // foobarbarbaz

// Some people prefer passing multiple parameters to echo over concatenation.
echo 'This ', 'string ', 'was ', 'made ', 'with multiple parameters. ',"\n";
echo 'This ' . 'string ' . 'was ' . 'made ' . 'with concatenation.' . "\n";

$a = 3 * 3 % 5; // (3 * 3) % 5 = 4
echo "\$a is indeed 4: ".$a."\n";

$a = $b += 3; // $a = ($b += 3) -> $a = 3, $b = 3

echo "\$a and \$b are indeed 3: ".$a.' '.$b."\n";

$a = 5;
echo "Should be 5: " . $a++ . "\n";
echo "Should be 6: " . $a . "\n";

echo "Preincrement \n";
$a = 5;
echo "Should be 6: " . ++$a . "\n";
echo "Should be 6: " . $a . "\n";

echo "Postdecrement \n";
$a = 5;
echo "Should be 5: " . $a-- . "\n";
echo "Should be 4: " . $a . "\n";

echo "Predecrement \n";
$a = 5;
echo "Should be 4: " . --$a . "\n";
echo "Should be 4: " . $a . "\n";

$b = 'z';
echo "Should be aa: ".++$b."\n";

?>