PHP用文件锁模拟进程锁
整体伪代码为：define("LOCK_FILE_PATH", "/tmp/lock");
if( !file_exists(LOCK_FILE_PATH) ){
$fp = fopen( LOCK_FILE_PATH, "w" );
fclose ( $fp );
}
$fp = fopen( LOCK_FILE_PATH, "r" );
if (!$fp) {
echo "Failed to open the lock file!
";
exit(1);//异常处理
}flock ( $fp, LOCK_EX );
//此处添加原子操作代码
flock ( $fp, LOCK_UN );
fclose ( $fp );
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