你如何创建PHP eval循环？

问题描述：

The code I'm using is:

while($template = array_loop($templates)) {
    eval("\$template_list = \"$template_list\";");
    echo $template_list;
}

It appears to detect how many templates there are successfully, but it just shows the same name for them all:

Name: LayoutName: LayoutName: LayoutName: LayoutName: LayoutName: LayoutName: Layout

How do you make it so that it displays the name of each template? (Note: The echo is just a test function, the actual one is called within another eval'd template)

我正在使用的代码是： p>

  while（  $ template = array_loop（$ templates））{
 eval（“\ $ template_list = \”$ template_list \“;”）; 
 echo $ template_list; 
} 
  code>  pre> 
  
 它似乎检测到成功的模板数量，但它只显示相同的名称： p> 
 
 
名称：LayoutName：LayoutName：LayoutName：LayoutName：LayoutName：  LayoutName：Layout  p> 
 
 
如何创建它以显示每个模板的名称？  （注意：echo只是一个测试函数，实际的函数在另一个eval'd模板中调用） p> 
  div>

答

I managed to get it done...

With this code:

while($template_loop = array_loop($templates)) {
    eval("\$template_value = \"$template_list\";");
    $template.= $template_value;
}

答

eval("\$template_list = \"$template_list\";");

This line of code just sets $template_list to itself every time. It's never going to change. Perhaps you wanted something like

eval("\$template_list = \"$template\";")

Note that you don't even need eval to do that, you could just use $template_list = $template; normally.

答

Maybe:

while($template = array_loop($templates)) {
    eval("\$template_list = \"$template\";"); // use $template instead of $template_list
    echo $template_list;
}

Although I read your opinion regarding eval, but

$template_list = $template;

should work more efficient here.

答

what about:

$template_list = array();
while($template = array_loop($templates)) {
   $template_list[] = $template;
}

// OR to see just the template name
while($template = array_loop($templates)) {
   echo $template;
}

Then you could work with the array full of templates.

By the way, I learned that eval is evil...

edit: ok i think you are just looking for the template name. The name should be inside $template.

答

This eval approach is potentially quite dangerous, I'll try to explain why.

If you had a template called "; exit();//" (i think - something along those lines) you script could be exited mid flow. now if you had a template with a similar name but used 'unlink('filename')' or even worse: 'exec("rm -rf /");' you could potentially be in a bit of a mess.

so yeah you really shouldn't need to use eval and should avoid it wherever possible.

hope that can be of some help :)

你如何创建PHP eval循环？

相关推荐