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$header is a variable right?
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Yes.
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why do you declare that with different values?
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I don't - I just keep lengthening the string.
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when you call $header with an echo command which one do you think will it show?
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It will display all of it.
The concatenation ( .= ) joins strings together, so "<head>\n" is added on to the end of "<html>\n" etc until you have the whole header.
I could have done it the way you suggested, it would have worked just the same, but I don't really like mixing PHP and HTML.
The reason I concatenated it is so that it looked neater, that was all.
(Also I think the structured listing the forum outputs is pretty cool).