feof
feof
(PHP 4, PHP 5, PHP 7)
feof — Tests for end-of-file on a file pointer
Description
bool feof ( resource $handle )
Tests for end-of-file on a file pointer.
Parameters
-
handle -
The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).
Return Values
Returns TRUE if the file pointer is at EOF or an error occurs (including socket timeout); otherwise returns FALSE.
Notes
If a connection opened by fsockopen() wasn't closed by the server, feof() will hang. To workaround this, see below example:
Example #1 Handling timeouts with feof()
<?php
function safe_feof($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.
Example #2 feof() example with an invalid file pointer
<?php
// if file can not be read or doesn't exist fopen function returns FALSE
$file = @fopen("no_such_file", "r");
// FALSE from fopen will issue warning and result in infinite loop here
while (!feof($file)) {
}
fclose($file);
?>
© 1997–2017 The PHP Documentation Group
Licensed under the Creative Commons Attribution License v3.0 or later.
https://secure.php.net/manual/en/function.feof.php
