(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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