What is the difference between using single quotes and double quotes in PHP when defining strings?

In PHP, single quotes and double quotes are used to define strings. The main difference between them is that with double quotes, PHP will interpret variables and escape sequences within the string, while with single quotes, it will treat the string literally without any interpretation. If you want to include variables or escape sequences in your string, you should use double quotes. If you want a literal string without any interpretation, you should use single quotes. 

// Using double quotes to include variables in the string
$name = 'Alice';
echo "Hello, $name!"; // Output: Hello, Alice!

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

Keywords

single quotes double quotes strings PHP syntax

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