What are the differences between single-quotes and double-quotes in PHP?

In PHP, single-quotes and double-quotes are used to define strings. The main difference between them is that variables and special characters within double-quotes are interpreted and expanded, while they are not in single-quotes. This means that if you want to include variables or special characters within a string, you should use double-quotes. 

$name = "John";
echo "Hello, $name!"; // Output: Hello, John!

// Using single-quotes will not interpret variables
echo 'Hello, $name!'; // Output: Hello, $name!

Keywords

PHP single-quotes double-quotes string interpolation escaping

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