如
<?php
$myfile = fopen("newfile.txt", "w") or die("Unable to open file!");
$txt = "Mickey Mouse\n";
fwrite($myfile, $txt);
$txt = "Minnie Mouse\n";
fwrite($myfile, $txt);
fclose($myfile);
//最后关闭文件
?>运行后打开newfile.txt, 是如下内容则写入成功
Mickey Mouse
Minnie Mouse如果用这个方法, 重复运行最上方的php程序,会覆盖原有newfile.txt的内容