<?PHP
	$a = 5;
	$b = 8;
	$t = $a + $b;

	echo "A = $a\n";
	echo "B = $b\n";
	echo "$a + $b = $t\n";
	echo "($a + $b) * ($a - $b) = $t * ($a - $b)\n";
	printf("%s = %s\n", ($a + $b) * ($a - $b), $t * ($a - $b));
	echo "$a^2 - $b^2 = $t * $a - $t * $b\n";
	printf("%s = %s\n", $a^2 - $b^2, $t * $a - $t * $b);
	echo "$a^2 - $t * $a = $b^2 - $t * $b\n";
	printf("%s = %s\n", $a^2 - $t * $a, $b^2 - $t * $b);
	echo "$a^2 - $t * $a + ($t^2)/4 = $b^2 - $t * $b + ($t^2)/4\n";
	printf("%s = %s\n", $a^2 - $t * $a + ($t^2)/4, $b^2 - $t * $b + ($t^2)/4);
	echo "($a - $t/2)^2 = ($b - $t/2)^2\n";
	printf("%s = %s\n", ($a - $t/2)^2,($b - $t/2)^2);
	echo "$a - $t/2 = $b - $t/2\n";
	printf("%s = %s\n",$a - $t/2, $b - $t/2);

	/*
C:\>c:\php\php.exe c:\test.php
A = 5
B = 8
5 + 8 = 13
(5 + 8) * (5 - 8) = 13 * (5 - 8)
-39 = -39
5^2 - 8^2 = 13 * 5 - 13 * 8
-3 = -39
5^2 - 13 * 5 = 8^2 - 13 * 8
-60 = -110
5^2 - 13 * 5 + (13^2)/4 = 8^2 - 13 * 8 + (13^2)/4
-64 = -106
(5 - 13/2)^2 = (8 - 13/2)^2
-3 = 3
5 - 13/2 = 8 - 13/2
-1.5 = 1.5
*/
?>