In PHP, when should you use single quotes vs. double quotes for escaping variables?

When you want to escape variables in PHP, you should use double quotes if you want to interpolate the variable's value within a string. This means that the variable's value will be replaced within the string. However, if you don't need to interpolate the variable and simply want to use its literal value, you should use single quotes to avoid unnecessary parsing. 

$name = "John";
// Using double quotes to interpolate the variable
echo "Hello, $name!"; // Output: Hello, John!

// Using single quotes to avoid unnecessary parsing
echo 'Hello, $name!'; // Output: Hello, $name!

Keywords

PHP single quotes double quotes escaping variables string interpolation

Related Questions