Flock funksiyasi

flock funksiyasi faylga bloklash o'rnatadi yoki olib tashlaydi. U birinchi parametr sifatida fopen orqali olingan fayl ko'rsatkichini, ikkinchi parametr sifatida bloklash turini (LOCK_SH, LOCK_EX yoki LOCK_UN) va uchinchi ixtiyoriy parametr sifatida bloklamaydigan operatsiya uchun bayroqni qabul qiladi.

Sintaksis

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

Misol

Faylni eksklyuziv kirish (yozish) uchun bloklash:

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

Misol

O'qish uchun bo'linadigan bloklash:

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;
?>

Misol

Bloklamaydigan bloklashni qo'lga kiritish urinishi:

php<?php
  $file = fopen("data.txt", "c+");
  if (flock($file, LOCK_EX | LOCK_NB, $would_block)) {
    if ($would_block) {
      echo "Fayl boshqa protsess tomonidan bloklangan";
    } else {
      fwrite($file, "Ma'lumot");
      flock($file, LOCK_UN);
    }
  }
  fclose($file);
?>

Shuningdek qarang