Single and double quote

Difference between Single-quote and double-quote in PHP
No. Single Quote Double Quote
1 Single Quote String will display things almost completely "as is." Variables and most escape sequences will not be interpreted. The exception is that to display a literal single quote, you can escape it with a back slash ‘, and to display a back slash, you can escape it with another backslash \ (So yes, even single quoted strings are parsed). Double Quote String will display a host of escaped characters (including some regexes), and variables in the strings will be evaluated. An important point here is that you can use curly braces to isolate the name of the variable you want evaluated. For example let’s say you have the variable $type and you what to echo "The $types are" That will look for the variable $types. To get around this use echo "The {$type}s are" You can put the left brace before or after the dollar sign. Take a look at string parsing to see how to use array variables and such.

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