What are the implications of using single quotes versus double quotes in PHP when defining newline characters (\n)?

Using single quotes in PHP when defining newline characters (\n) will treat the backslash (\) as a literal character rather than an escape character. This means that \n will be treated as two separate characters rather than a newline character. To properly define a newline character using single quotes, you can use the PHP_EOL constant instead. 

// Using double quotes
echo "Hello\nWorld";

// Using single quotes with PHP_EOL constant
echo 'Hello' . PHP_EOL . 'World';

Keywords

single quotes double quotes newline characters escape sequences string interpolation

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