Chế độ Append trong PHP

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$myFile = "testFile.txt";
$fh = fopen($myFile, 'a') or die("can't open file");
$stringData = "New Stuff 1\n";
fwrite($fh, $stringData);
$stringData = "New Stuff 2\n";
fwrite($fh, $stringData);
fclose($fh);

Kết quả:

Floppy Jalopy
Pointy Pinto
New Stuff 1
New Stuff 2