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

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

Misol

Faylni eksklyuziv kirish (yozish) uchun bloklash:

<?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
	$file = fopen("data.txt", "r");
	if (flock($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
	$file = fopen("data.txt", "c+");
	if (flock($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

fopen funksiyasini,
u faylni ochadi
fclose funksiyasini,
u faylni yopadi
is_writable funksiyasini,
u yozish imkoniyatini tekshiradi