What are the differences between using single quotes and double quotes in PHP for strings?

In PHP, single quotes and double quotes are used to define strings. The main difference between the two is that double quotes allow for the interpolation of variables and special characters within the string, while single quotes treat everything literally. Using single quotes can be more efficient for simple strings that do not require variable interpolation, while double quotes are necessary when you need to include variables or special characters within the string. 

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

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

Keywords

PHP single quotes double quotes strings concatenation

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