How to create a tiny Prolog compiler?

Now, I want to create a very tiny Prolog compiler. But, I don't know much about a tiny compiler.

Can you help me to write a very tiny Prolog compiler? Please don't delete or close this question.

I will use your code for my private programming learning only. So, please keep your source code be private. (see at the end of this question: Note.)

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Your own compiler must works as these features:

• Simple as these code (http://ift.tt/1ImnCm8, or http://ift.tt/1KNGMqM) only: (as in Description section).
• Allow space insensitive.
• Some replaces for syntax rules:
  • Connection (is comma) (,) is replaced by star (*).
  • Djsjuntion (is semicolon) (;) is replaced by plus (+).
  • Rule (is :-) (:-) is replaced by colon (:).
  • Query/question (is ?-) is replaced by question mark (?).
• Lexical scope: global.
• Allow these variables: _ABC, abc, Abc ...
• Allow use brackets (such as: ()) to change the order of precedence.
• Cut and list are not required.
• String type is not required.
• Show all possible solution.

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Your code must be:

• Written in PHP, and compatible with PHP 4, PHP 5.
• Please don't write your code in object oriented programming.
• Your code be tested with QuickPHP).
• Please don't test your code with online IDEs, such as: ideone.com, eval.in ...

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Here is my own HTML interface:

<?php

$source_code_box = $_POST['source_code_box'];

?>
<form action="compiler.php">
<textarea name="source_code_box"></textarea>
<br />
<input type="submit" name="compile_button" />
</form>
<hr />
<?php

yourfunction($source_code_box);

?>

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Here are some useful source code:

• http://ift.tt/1KNGMqM (in Object-J)
• http://ift.tt/1KNGNLC (in JavaScript)
• http://ift.tt/1ImnBi2 (in JavaScript)
• http://ift.tt/1KxzeFU (in Perl)
• http://ift.tt/1ImnCma (in Pascal)
• http://ift.tt/1KNGNLE (in JavaScript)

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Sorry about my English, it is so bad. If my question is not clear, please comment bellow this question.

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Note: Your complete source code must be uploaded, at here (http://ift.tt/1ImnBi6). Then, if your file is uploaded, it will return an MD5 string. Please copy this MD5 string, and paste it into Stack Overflow as your answer. I will read your code later, and give my own 500 score bounty for you.