(PHP 4, PHP 5, PHP 7)
Tests for end-of-file on a file pointer
bool feof ( resource $handle )
Tests for end-of-file on a file pointer.
Parameters:
handle
The file pointer must be valid, and must point to a file successfully opened by fopen() or fsockopen() (and not yet closed by fclose()).
Returns:
Returns TRUE
if the file pointer is at EOF or an error occurs (including socket timeout); otherwise returns FALSE
.
Examples:
Handling timeouts with feof()
If a connection opened by fsockopen() wasn't closed by the server, feof() will hang. To workaround this, see below example:
<?php function safe_feof($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 */ } ?>
feof() example with an invalid file pointer
If the passed file pointer is not valid you may get an infinite loop, because feof() fails to return TRUE
.
<?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); ?>
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