Ray, thank you very much for your assistance. I highly appreciate it.
After a close inspection, I found the cause behind this.
Because I moved my WA and Dreamweaver installation to a new computer, I downloaded the website php source files from the FTP using Filezilla and somehow, when copying the files, it changed them that way. I have seen Filezilla do weird things when copying depending on the copy mode used.
I downloaded again the source files using WinSCP and everything was clean and correct.