$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
fwrite($myfile, "Content to write to file");
fclose($myfile);// if not file is there then automatic create and write inside it.
$fptr = fopen('myfile.txt','w');
fwrite($fptr,"i am writing file in this\n");
fwrite($fptr,'writing another line.');
fclose($fptr);<?php
$file = 'people.txt';
// Open the file to get existing content
$current = file_get_contents($file);
// Append a new person to the file
$current .= "John Smith\n";
// Write the contents back to the file
file_put_contents($file, $current);
?>$data[] = $_POST['data'];
$inp = file_get_contents('results.json');
$tempArray = json_decode($inp);
array_push($tempArray, $data);
$jsonData = json_encode($tempArray);
file_put_contents('results.json', $jsonData);<?php
$myfile = fopen("file_name.txt", "w") or die("Unable to open file!");
$txt = "Hello world\n";
fwrite($myfile, $txt);
$txt = " Php.\n";
fwrite($myfile, $txt);
fclose($myfile);
?>