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Single or Double Quotes?

Should you use single or double quotes in your code?

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Sometimes people use double quotes in PHP to avoid having to use the period to separate code. For example, you could write:
"I have a $color shirt on today";
Faster however is not always better. A better way to write this code would be:
'I have a ' .$color. ' shirt on today';
Phrasing your code in the second method will result in less chance of error messages, or problems with other programmers deciphering your code.
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