PHP文件系统操作

<?php
	$fp = fopen("fx", "rb");
	while(false !== ($ch = fgetc($fp))) echo $ch;

	echo "<br><br>";
	fseek($fp, 0, SEEK_SET);
	while( ! feof($fp)) echo fgets($fp);
	
	echo "<br><br>";
	fseek($fp, 0, SEEK_SET);
	echo fread($fp, 100);
	fclose($fp);
	
	echo "<br><br>";
	echo readfile("fx");
	
	echo "<br><br>";
	echo file_get_contents("fx");
	
	echo "<br><br>";
	$arr = file("fx");
	foreach($arr as $value) echo $value."<br>";
	
	$pic = file_get_contents('yang.jpg');
	file_put_contents("fu.jpg", $pic);
	echo "<img src='fu.jpg'>";
	
	echo is_dir("upload");
	$dir = scandir("upload");
	foreach($dir as $value) echo $value."<br>";
?>