08c09-1.php

介绍PHP5的给类型函数应用

<?php
// Open the file to append data to it
if (!($fp = fopen('data.log', 'a'))) {
	die ('ERROR: Could not open file!');
}

// At this point we need to remove the ability for a user to abort
ignore_user_abort(true);

// Now attempt to get an exclusive lock
if (!(flock($fp, LOCK_EX))) {
	die('ERROR: Could not get exclusive lock!');
}

// We now have the lock, To make sure that another file didn't
// write data into this file while we waited for the lock, seek
// to the end of the file:
fseek($fp, 0, SEEK_END);

// Now we can write our data:
fwrite($fp, 'A Random Number: ' . rand() . "\n");

// Close the file - Which also releases the lock
fclose($fp);

// And now allow a user abort again:
ignore_user_abort(false);

// Now echo out our file contents so that we can see what happened:
echo '<pre>';
readfile('data.log');
echo '</pre>';
?>