How does the use of double quotation marks versus single quotation marks impact variable interpolation in PHP?

Using double quotation marks in PHP allows for variable interpolation, meaning that variables within the string will be evaluated and replaced with their values. However, when using single quotation marks, variable interpolation does not occur and the variable name itself will be displayed. To ensure proper variable interpolation, always use double quotation marks when working with strings that contain variables in PHP. Example PHP code snippet: 

$name = "John";
// Using double quotation marks for variable interpolation
echo "Hello, $name!"; // Output: Hello, John!

// Using single quotation marks without variable interpolation
echo 'Hello, $name!'; // Output: Hello, $name!

Keywords

double quotation marks single quotation marks variable interpolation PHP string manipulation

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