PHP add new line using the fwrite() function

Posted on Oct 04, 2022

Learn the best practice to add new line when using the fwrite() function

When you need to add a new line (or line break), you need to use the PHP_EOL constant.

The reason to use PHP_EOL instead of \n or \r\n is that PHP_EOL will write the escape sequence that fits the operating system where you run PHP.

Windows OS uses \r\n while UNIX uses \n for its new line escape sequence.

PHP_EOL automatically writes the escape sequence that fits the operating system.

The example below shows how to add new line at the end of the fwrite() process:

// 👇 open file named test.txt
$file = fopen("test.txt", "w");

// 👇 add PHP_EOL as argument
fwrite($file, "Hello World!" . PHP_EOL);

// 👇 separate PHP_EOL for clarity
fwrite($file, "This text is written using PHP");
fwrite($file, PHP_EOL);
fwrite($file, "End of file");

// 👇 close file

The output in test.txt will be:

Hello World!
This text is written using PHP
End of file

Using PHP_EOL allows PHP to determine the right escape sequence to use depending on your operating system.

This constant helps you add a new line when writing to a file using the fwrite() function.

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