Message board without database support

A simple message board without database support, mainly an exercise in storing and reading data in files.

/**
 * This is a single-page message board system without database support
 * Knowledge points:
 * 1. Use of heredoc documents: >>>EOT EOT; There cannot be any space before the second EOT line
 * 2 , file read and write operations
 * 3. The difference between fread and fgets, fread reads a string of specified length, fgets reads a line, when the data is saved, one line is a message content, which is convenient for reading
 *
 * 4. File Lock, this version has not been implemented yet, only the reference code is written.
 *
*/

$file = "message.txt";
if(isset($_POST)&&!empty($_POST)){
 $post = $ _POST;
 $content ="title:".$post['title'].' content:'.$post['message']."nr";
 if( file_exists($file) ){
 add_message($ file,$content);
 }else{
 create_message_file($file,$content);
 }
}


/**
 * Create a message file and save the message when using it for the first time
 * Enter description here...
 * @param unknown_type $file
 * @param unknown_type $message
*/
function create_message_file($file,$message){
 $msgh = fopen($file,"w");
 //flock($file, LOCK_EX);
 fwrite($msgh,$message);
 fclose($msgh);
 //echo "Add message message successfully.";
 echo <<
 EOT;

}

/**
 * Add new message information to the file
 * Enter description here...
 * @param unknown_type $file
 * @param unknown_type $message
*/
function add_message($file,$message){
 $msgh = fopen($file, "a");
 //flock($msgh,LOCK_EX) ;
 fwrite($msgh,$message);
 fclose($msgh);
 //echo "Your message has been saved successfully.";
 echo <<
EOT;
}

/**
 * Display message content
 * Enter description here ...
 * @param unknown_type $file
*/
function show_message($file){
	$msgh = fopen($file, "r");
	//flock($msgh, LOCK_EX);
	while($msg = fgets($msgh)){
		echo $msg;
		echo "";
	}
	fclose($msgh);
}



?>






无数据库支持的简单留言板





        

无数据库支持的简单留言板__留言内容显示

	if(!file_exists($file)||filesize($file)<1){?>        	}else{?>        	}?>  


暂时还没有留言




         show_message($file);    ?>


                

请在下面输入你的留言标题和内容



	
  	标题  
  	内容

复制代码