(PHP 4, PHP 5, PHP 7, PHP 8)
feof — Tests for end-of-file on a file pointer
stream
The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by 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:
Example #1 Handling timeouts with feof()
<?phpfunction 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) < $timeout){ /* Handle */}?>
If the passed file pointer is not valid you may get an infinite loop, because
feof() fails to return true
.
Example #2 feof() example with an invalid file pointer
<?php// if file can not be read or doesn't exist fopen function returns FALSE$file = @fopen("no_such_file", "r");// FALSE from fopen will issue warning and result in infinite loop herewhile (!feof($file)) {}fclose($file);?>