(PHP 4, PHP 5, PHP 7, PHP 8)
feof — Tests for end-of-file on a file pointer
stream
Вказівник на файл має бути дійсним та має вказувати на файл, успішно відкритий функцією fopen() або fsockopen() (та не закритий функцією fclose()).
Returns true
if the file pointer is at EOF or an error occurs
(including socket timeout); otherwise returns false
.
If a connection opened by fsockopen() wasn't closed by the server, feof() will hang. To workaround this, see below example:
Приклад #1 Handling timeouts with feof()
<?php
function safe_feof($fp, &$start = NULL) {
$start = microtime(true);
return feof($fp);
}
/* Assuming $fp is previously opened by fsockopen() */
$start = NULL;
$timeout = ini_get('default_socket_timeout');
while(!safe_feof($fp, $start) && (microtime(true) - $start) < $timeout)
{
/* Handle */
}
?>
If the passed file pointer is not valid you may get an infinite loop, because
feof() fails to return true
.
Приклад #2 feof() example with an invalid file pointer
<?php
// if file can not be read or doesn't exist fopen function returns FALSE
$file = @fopen("no_such_file", "r");
// FALSE from fopen will issue warning and result in infinite loop here
while (!feof($file)) {
}
fclose($file);
?>