Explain how syntax errors occur in php, PHP Web Programming

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Question:

(a) With the help of a diagram, illustrate how Three-Tier Web application architecture operates.

(b) Explain how syntax errors occur in PHP.

(c) Exceptions are used to change the normal flow of a script if a specified error occurs.

(i) Explain what happens when an Exception is triggered?

(ii) Describe how the Try, Throw and Catch statements are used to handle an exception.

(d) Write a PHP program that allows you to:

(i) create the text file "test.txt"

(ii) insert the text: "Hello dear" into the file

(iii) append the text: "Welcome" to the file.


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