how to make a changerate.php file for:

Read a file: rate.php
Find string : 'USD' => '0.33'
Put '0.33' value in an editable textbox. I can change this value, let's say to 0.35;
I Have an Update Button, when I press, the new value (0.35) change with old value 
(0.33) in rate.php like this: 'USD' => '0.35'

Any help will be deeply apreciated

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