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

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

Mfano

Kufungwa kwa faili kwa upatikanaji wa kipekee (kuandika):

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

Mfano

Jaribio lisilozuia la kukamata kizuizi:

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

kazi fopen,
ambayo inafungua faili
kazi fclose,
ambayo inafunga faili
kazi is_writable,
ambayo inakagua uwezekano wa kuandika