Question

php eval函数看不明白

Answer 1

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

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

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

输出结果：
This is a $string $time morning!
This is a beautiful winter morning!

Answer 2

eval()把括号中的内容作为php语句来执行,这个语句必须符合php的语法,而且要以分号结尾.

Answer 3

eval是个危险的函数，他会把内容当前php来执行的。