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first off, here is the rule on "" and '' in php.
" and " should be used where you have vars in there, if possible, use . to keep var seperate from strings as much as possible. " and " take more processing times since they check for vars inside them. This method is taught the most, but is the wrong way of doing things.
' and ' do not check for vars, and will speed your script up nicely, and it is also good coding habit. Use . to keep vars seperate.
Either way works, just the little differences in them.
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