eval是否与日期函数和数学函数（例如rand）一起使用？

Question

So I have code which load one of txt file, which include one of this line:

• print "text";
• rand(1,25);
• date("F j, Y, g:i a");

When I run this code, print "text" line works correctly, however rand and date give me just blank page.

Even using error capturing code I vave no any error message.

Answer 1

It looks like you're running

eval("rand(1,25);");

for example, which will simply call that function and discard the return value. You need the print statement for every call to see the result in the output:

eval("print rand(1,25);");

An alternative is to use return:

$result = eval("return rand(1,25);");
print $result;