


Share two solutions for PHP to implement multiple processes writing the same file at the same time
Test point: Understanding of function
fopen: Open a file or URL
参数1:文件地址或者URL 参数2:mode 参数指定了所要求到该流的访问类型 'r' 只读方式打开,将文件指针指向文件头。 'r+' 读写方式打开,将文件指针指向文件头。 'w' 写入方式打开,将文件指针指向文件头并将文件大小截为零。如果文件不存在则尝试创建之。 'w+' 读写方式打开,将文件指针指向文件头并将文件大小截为零。如果文件不存在则尝试创建之。 'a' 写入方式打开,将文件指针指向文件末尾。如果文件不存在则尝试创建之。 'a+' 读写方式打开,将文件指针指向文件末尾。如果文件不存在则尝试创建之。
fwrite: Write a file
参数1:文件名文件系统指针 参数2: 要写入的内容 string类型 返回值: 写入成功返回写入的字符数,失败返回false
flock: Lightweight advisory file locking
参数1:文件系统指针,是典型地由 fopen() 创建的 resource(资源)。 参数2:模式 LOCK_SH取得共享锁定(读取的程序)。 LOCK_EX 取得独占锁定(写入的程序。 LOCK_UN 释放锁定(无论共享或独占)。 如果不希望 flock() 在锁定时堵塞,则是 LOCK_NB(Windows 上还不支持)。 返回值:成功时返回 TRUE, 或者在失败时返回 FALSE。
fclose: Close an open file pointer
参数1:文件名 参数2:成功时返回 TRUE, 或者在失败时返回 FALSE。
Option 1
function writeData($filepath, $data) { $fp = fopen($filepath,'a'); do{ usleep(100); }while (!flock($fp, LOCK_EX)); //LOCK_EX 取得独占锁定(写入的程序)进行排它型锁定 获取锁 有锁就写入,没锁就得 $res = fwrite($fp, $data."\n"); flock($fp, LOCK_UN); //LOCK_UN 释放锁定(无论共享或独占)。 fclose($fp); return $res; }
Option 2 (Method of marking yourself)
function write_file($filename, $content) { $lock = $filename . '.lck'; $write_length = 0; while(true) { if( file_exists($lock) ) { usleep(100); } else { touch($lock); $write_length = file_put_contents($filename, $content, FILE_APPEND); break; } } if( file_exists($lock) ) { unlink($lock); } return $write_length; }
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