What is the difference between using single quotes and double quotes for variable interpolation in PHP?

When using double quotes in PHP for variable interpolation, the variables within the string will be evaluated and replaced with their values. However, when using single quotes, the variables will be treated as literal strings and will not be evaluated. To ensure variable interpolation, always use double quotes. 

$name = "Alice";
// Using double quotes for variable interpolation
echo "Hello, $name!"; // Output: Hello, Alice!

// Using single quotes will not interpolate the variable
echo 'Hello, $name!'; // Output: Hello, $name!

Keywords

PHP single quotes double quotes variable interpolation string concatenation

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