How backwards compatible is php 5 with php 4? -

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I work on the code base written in php 4. I want to go through the process of upgrading the code to PHP 5 (My host offers the latest version) I am thinking that anyone else has gone through the same upgrade experience and what is found / Can share flaws, what has changed in my code, is not compatible with the previous versions? Take a look at this: Your current PHP 4 code should still work, though there are some.


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