In what situations can using single quotes (') versus double quotes (") in PHP code make a difference?

Using single quotes (' ') or double quotes (" ") in PHP code can make a difference when dealing with string interpolation. Double quotes allow for the interpolation of variables and special characters within the string, while single quotes treat everything as a literal string. If you need to include variables or special characters within a string, you should use double quotes to ensure proper interpolation. 

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

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

Keywords

single quotes double quotes PHP code string interpolation variable parsing

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