When should double quotes ("") be used over single quotes ('') in PHP?

Double quotes should be used over single quotes in PHP when you need to include variables or special characters within a string. Double quotes allow for variable interpolation, meaning that variables will be evaluated and replaced within the string. Single quotes, on the other hand, treat everything within them as a literal string, including variables. Using double quotes can make your code more readable and concise when working with strings that contain variables or special characters. 

$name = "John";
echo "Hello, $name!"; // Output: Hello, John!

Keywords

double quotes single quotes PHP string interpolation variable interpolation

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