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<?php ob_start(); ?><html><head><style type='text/css'>	form input { border:1px solid #c00; margin:4px 0;}</style></head><body><?phpif(!isset($_POST['submit'])) {?>	<form method='post' action="<?php echo $_SERVER['PHP_SELF']; ?>">		enter email:<br />		<input type='text' name='email' maxlength='30' size='30' /><br />		<input type='submit' name='submit' value='Post' />	</form><?php} else {	if(!empty($_POST['email'])) {		$pattern = "/^[A-z0-9\._-]+" 			. "@"			. "[a-z0-9][a-z0-9-]*"			. "(\.[a-z0-9_-]+)*"			. "\.([a-z]{2,6})$/i";		if(preg_match($pattern,$_POST['email'])) {			$email = $_POST['email'];			$filename = 'usermail.txt';						if(is_readable($filename)) {				$fp = fopen($filename, 'r');				$fsize = filesize($filename);				if($fsize > 0) {					while(!feof($fp)) {						$str = fgets($fp,$fsize);						//echo $str;						if(strcasecmp($str,$email) == 1) {							$match = 1;							break;						} else {							$match = 0;						}					}				}				if($match == 0) {					$fp = fopen($filename, 'a');								if(fwrite($fp, $email .  "\n")) {						echo 'Thank you for your submission.<br />';					} else {						echo 'Input error.';					}				} else {					echo 'mail address exists.';				}				fclose($fp);			} else {				$filename = 'usermail.txt';				$fp = fopen($filename, 'w');				echo 'Preparing Output file...';				header('Refresh:3; URL=filefunc.php');			}		}	} else {		echo 'field cannot be empty';	}}ob_end_flush();?>	 </body></html>