What is the difference between using " " and ' ' in PHP programming?

In PHP programming, using double quotes (" ") allows for variable interpolation, meaning variables inside the quotes will be evaluated and replaced with their values. Single quotes (' ') treat everything inside them as a literal string, without variable interpolation. It is important to choose the appropriate quotation marks based on whether you need variable interpolation or not. 

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

// Using single quotes for a literal string
echo 'Hello, $name!'; // Output: Hello, $name!

Keywords

double quotes single quotes string interpolation escape sequences variable parsing

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