<?php

$test = @fopen("http://download.yahoo.com/dl/msgr75/us/yamsgr75us.exe", "rb");

if ( $test )
{
print "File ok";
}
else
{
print "File not found";
}

?>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<b>Nhập link bạn cần kiểm tra vào đây</b>
<form method="post" action="" target="_self">
<input type="text" name="link" value="http://" size=50 maxlength=200>
<br>
<input type="submit" value="Check" name="checklink">
</form>
<?php
if (isset($_POST["link"])) $link = $_POST["link"]; else $link='';
$test = @fopen("$link", "rb");

if ( $test )
{
print "File is ok";
}
else
{
print "File not found";
}

?>