Kazi ya flock

Kazi ya flock inaweka au inaondoa kizuizi cha faili. Kigezo cha kwanza kinachukua pointer kwa faili, kilichopatikana kupitia fopen, kigezo cha pili - aina ya kizuizi (LOCK_SH, LOCK_EX au LOCK_UN), na kigezo cha tatu kisichohitajika - bendera ya operesheni isiyoizuia.

Syntax

phpflock(resource $handle, int $operation, int &$would_block = null): bool

Mfano

Kufungwa kwa faili kwa upatikanaji wa kipekee (kuandika):

php<?php
  $file = fopen("data.txt", "c+");
  if (flock($file, LOCK_EX)) {
    ftruncate($file, 0);
    fwrite($file, "Data Mpya");
    flock($file, LOCK_UN);
  }
  fclose($file);
?>

Mfano

Kizuizi cha kushirikia kwa kusoma:

php<?php
  $file = fopen("data.txt", "r");
  if (flock($file, LOCK_SH)) {
    $content = fread($file, filesize("data.txt"));
    flock($file, LOCK_UN);
  }
  fclose($file);
  echo $content;
?>

Mfano

Jaribio lisilozuia la kukamata kizuizi:

php<?php
  $file = fopen("data.txt", "c+");
  if (flock($file, LOCK_EX | LOCK_NB, $would_block)) {
    if ($would_block) {
      echo "Faili imefungwa na mchakato mwingine";
    } else {
      fwrite($file, "Data");
      flock($file, LOCK_UN);
    }
  }
  fclose($file);
?>

Tazama pia