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Thanks a lot requinix for your quick and relevant answer ! It works perfect ! You are definitely the strongest

Hi All, There is a very interesting solved topic here (http://www.phpfreaks.com/forums/index.php?topic=304966.0) about how to access elements in embedded _POST array. But before accessing an element, it might be appropriate to check whether the array it is supposed to be in exists. According to the solution given in the topic indicated above, $_POST['matType'] is an example of embedded array . Is there a way to check if this array exists? Thanks in advance for your help.