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How to initialize strings with single quotes or double quotes?

Answer:

Since the data inside the single-quoted string is not parsed for variable substitution, it's always a better idea speed-wise to initialize a string with single quotes, unless you specifically need variable substitution.

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Please explain the difference between characters 23 and x23?	<?php $str = 'Hello, there.nHow are you?nThanks for visiting Us'; print $str; ?> Why does not given code print the newline properly?