What is the significance of using single quotes vs double quotes in PHP syntax?

Using single quotes versus double quotes in PHP syntax determines how the string is interpreted. Double quotes allow for the interpolation of variables and special characters within the string, while single quotes treat everything literally. If you want to prevent PHP from interpreting variables or special characters within a string, it is best to use single quotes. 

// Using single quotes to prevent variable interpolation
$name = 'John';
echo 'Hello, ' . $name . '!'; // Output: Hello, John!

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

Keywords

single quotes double quotes PHP syntax string interpolation variable parsing

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