分页问题（PHP超全局变量问题，未定义索引）

Question

i am trying to implement pagination somewhere and i have this issue:

I have this part to change links:

echo " <a href='$_SERVER[SCRIPT_NAME]?Page=$Prev_Page'><< Back</a> ";  

which gives this error for this part:

$Page = $_GET["Page"];  
if(!$_GET["Page"])  
{  

It says undefined index.. Why do I get this Error? Thanks

Answer 1

You should quote the array index. also use html entities. Like this

echo " <a href='{$_SERVER['SCRIPT_NAME']}?Page=$Prev_Page'>&lt;&lt; Back</a> "; 

And its safe to check if $_GET["Page"] exists.

$Page = isset($_GET["Page"]) ? $_GET["Page"]: false;