无法使用$ _POST值设置会话变量

Question

设置此变量会产生错误; 我尝试了所有可能的方法,但我无法调试:

 >1.  $_SESSION[clas = $_POST['clas']];   ERROR Parse error: syntax error, unexpected '=',                     expecting ']' in C:\wamp\www\st_db_1\search_db.php on line 51

 >2. $_SESSION['clas = $_POST['clas']'];  ERROR  Parse error: syntax error, unexpected T_STRING, expecting ']' in C:\wamp\www\st_db_1\search_db.php on line 51

 >3 $_SESSION['clas = $_POST[clas]'];   ERROR  Notice: Undefined index: clas = $_POST[clas] in C:\wamp\www\st_db_1\search_db.php on line 51

 >4 $_SESSION[clas = $_POST[clas]];   ERROR  Parse error: syntax error, unexpected '=', expecting ']' in C:\wamp\www\st_db_1\search_db.php on line 51

请给我一些建议.

Answer 1

$_SESSION['clas'] = $_POST['clas'];