Function to create a file, add some content and write out to the browser.

create_write_read_file.php

<?php
// createFile function
function createFile($filename) {

	// Declare content
    $content = "Some content here";
    $morecontent = "And some more content here";
	
	// Add content to file
    file_put_contents(
        $filename, 
    "$content\n$morecontent"
    );
	
	// Message browser
	echo $filename . " updated.<hr / >";
	
	// Open file, read only
	$file = fopen($filename, "r") or exit("Unable to open file!");
	
	//Output a line of the file until the end is reached
	while(!feof($file))
	  {
	  echo fgets($file). "<br / >";
	  }
	fclose($file);
}

// Declare file name
$createFilename = "file.txt";

// Call function, taking $createFilename as an argument
createFile($createFilename);

?>