edecode

Hello guys,

I am studying about function eval() and I can't know how and why this functions is necessary! I wrote this code:

<?php
		$string = "beautiful";
		$time = "winter";

		$str = 'This is a $string $time morning!';
		echo $str. "<br>";

		eval("\$str = \"$str\";");
		echo $str;

		$code1 = "echo 'Hello World!'; ";
		$code2 = "?>";
		 
		$code_php = '<?php $code1 $code2';
		echo $code_php;

		eval("\$code_php = \"$code_php\";");
		echo $code_php;
		
?>

On first echo the result should be this: "This is a beautiful winter morning!", that's right?

On second echo the result should be a code in php "This is a $string $time morning!"

On third echo the result should be this: "Hello World"

Lastly, the fourth echo the result should be a code in php: "<?php $code1 $code2"

Am I do this right?

Thanks