Do you surprise? we cannot use PHP setcookie() function in any place we like of whole code,
for example1:

It displays Warning message:
Warning: Cannot modify header information – headers already sent by (output started at C:\xampp\htdocs\iphone\testcookie.php:4) in C:\xampp\htdocs\testcookie.php on line 5

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Solution 1: if we change the code like below, it could working,
the problem is setcookie() function,
$_COOKIE[“TestCookie”]; reading function is working well,

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Solution 2: Use ob_start() function