error msg:

Fatal error: Uncaught SoapFault exception: [aws:Client.MissingParameter] The request must contain the parameter Signature. in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\395097_Code_for_Downlo ad\ch10\php6_books.php:15 Stack trace: #0 [internal function]: SoapClient->__call('ItemSearch', Array) #1 C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\395097_Code_for_Downlo ad\ch10\php6_books.php(15): SoapClient->ItemSearch(Array) #2 {main} thrown in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\395097_Code_for_Downlo ad\ch10\php6_books.php on line 15

when i google 'Fatal error: Uncaught SoapFault exception: [aws:Client.MissingParameter] The request must contain the parameter Signature', i found there a few live website have the same problem. did amazon change the setting? or i put the wrong 'AWSAccessKeyId'? my AWSAccessKeyId

I am using PHP Version 5.2.10, BTW

You are right, and that code does not work any more. You need to pass in the Signature, which is calculated based on the secret access key (not your access key id). You can find your own secret access key on your amazon account page, the same place where you find your access key id.