File operation in PHP

Open File

fopen() returns false when the file can not be openned.

if ($fp=fopen(“test.txt”, “w”)){

//do something

}

Close File

fclose($fp);

Reading from file

fgets($fp, 1024);  // get 1024 bytes

feof($fp);  // end of the file

fread($fp, 16);  // get 16 bytes

fseek($fp, 64);  // move point to particular byte

fgetc($fp);  // get the first letter

fwrite($fp, “Hello World”);  //write into file

fputs($fp, “Hell world again”); // add into file

Looking Files

flock($fp, LOCK_SH); //share

flock($fp, LOCK_EX); //exclusive

flock($fp, LOCK_UN); //unlock