How to pass value using a tag in php page

The value of the a tag in php is generally passed in the get method. The general format is to follow the link address? act=Add the value you want to pass, and then in the PHP processing page, use $_GET['act'] to accept the value passed by a, and then process it. Specific example:
html:

<a href="ucenter.php?act=showcart">我的测试</a>

php:

if( isset($_GET['act']) && trim( $_GET['act'] )== 'showcart'){
echo 'a传值成功了';
｝

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