File is binary in PHP 4+ min ??

[carri]

PHP Code:

if (!function_exists('is_binary')) {
/**
* Determine if a file is binary. Useful for doing file content editing
*
* @access public
* @param mixed $link Complete path to file (/path/to/file)
* @return boolean
* @see link user notes regarding this created function
*/
function is_binary($link) {
$tmpStr = '';
$fp = @fopen($link, 'rb');
$tmpStr = @fread($fp, 256);
@fclose($fp);

if ($tmpStr) {
$tmpStr = str_replace(chr(10), '', $tmpStr);
$tmpStr = str_replace(chr(13), '', $tmpStr);

$tmpInt = 0;

for ($i = 0; $i < strlen($tmpStr); $i++) {
if (extension_loaded('ctype')) {
if(!ctype_print($tmpStr[$i])) $tmpInt++;
} elseif (!eregi("[ -- This message may have been cut off and the rest will only be shown to members. To become a member, click here --

[Deur]

Well, ASCII files are binary. All files are binary. It's in the nature of files to be binary.

If you're wanting to identify when a file contains only ASCII characters, all ASCII bytes are <0x80. That includes the control characters <0x20 (particularly HT, LF, CR, but also includes BEL, NUL, and others). If you want to allow those, then the character class would be
Code:
[\x09\x0d\x10\x20-\x7f]Any character that doesn't match that (i.e. matches
Code:
[^\x09\x0d\x10\x20-\x7f]would indicate that the file it's in is not ASCII (by these criteria). -- This message may have been cut off and the rest will only be shown to members. To become a member, click here --