$2$3', $string);
$string = preg_replace('#(^|[\n \-\*/\.])_(.+?)_($|[ \-\*/\.\!\?,:])#is', '$1$2$3', $string);
$string = preg_replace('#(^|[\n \-_\*\.])/(.+?)/($|[ \-_\*\.\!\?,:])#is', '$1$2$3', $string);
return nl2br($string);
}
/**
* Convert given number to human readable file size string.
* Will append Bytes, KiB, etc. depending on magnitude of number.
*
* @param type $bytes numeric value of the filesize to make readable
* @param type $decimals number of decimals to show, -1 for automatic
* @return type human readable string representing the given filesize
*/
public static function readableFileSize($bytes, $decimals = -1)
{
static $sz = array('Byte', 'KiB', 'MiB', 'GiB', 'TiB', 'PiB');
$factor = floor((strlen($bytes) - 1) / 3);
if ($factor == 0) {
$decimals = 0;
} elseif ($decimals === -1) {
$decimals = 2 - floor((strlen($bytes) - 1) % 3);
}
return sprintf("%.{$decimals}f ", $bytes / pow(1024, $factor)) . $sz[$factor];
}
public static function sanitizeFilename($name)
{
return preg_replace('/[^a-zA-Z0-9_\-]+/', '_', $name);
}
public static function safePath($path, $prefix = '')
{
if (empty($path))
return false;
$path = trim($path);
if ($path{0} == '/' || preg_match('/[\x00-\x19\?\*]/', $path))
return false;
if (strpos($path, '..') !== false)
return false;
if (substr($path, 0, 2) !== './')
$path = "./$path";
if (empty($prefix))
return $path;
if (substr($prefix, 0, 2) !== './')
$prefix = "./$prefix";
if (substr($path, 0, strlen($prefix)) !== $prefix)
return false;
return $path;
}
/**
* Create human readable error description from a $_FILES[<..>]['error'] code
*
* @param int $code the code to turn into an error description
* @return string the error description
*/
public static function uploadErrorString($code)
{
switch ($code) {
case UPLOAD_ERR_INI_SIZE:
$message = "The uploaded file exceeds the upload_max_filesize directive in php.ini";
break;
case UPLOAD_ERR_FORM_SIZE:
$message = "The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form";
break;
case UPLOAD_ERR_PARTIAL:
$message = "The uploaded file was only partially uploaded";
break;
case UPLOAD_ERR_NO_FILE:
$message = "No file was uploaded";
break;
case UPLOAD_ERR_NO_TMP_DIR:
$message = "Missing a temporary folder";
break;
case UPLOAD_ERR_CANT_WRITE:
$message = "Failed to write file to disk";
break;
case UPLOAD_ERR_EXTENSION:
$message = "File upload stopped by extension";
break;
default:
$message = "Unknown upload error";
break;
}
return $message;
}
/**
* Is given string a public ipv4 address?
*
* @param string $ip_addr input to check
* @return boolean true iff $ip_addr is a valid public ipv4 address
*/
public static function isPublicIpv4($ip_addr)
{
if (!preg_match("/^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/", $ip_addr))
return false;
$parts = explode(".", $ip_addr);
foreach ($parts as $part) {
if (!is_numeric($part) || $part > 255 || $part < 0)
return false;
}
if ($parts[0] == 0 || $parts[0] == 10 || $parts[0] == 127 || ($parts[0] > 223 && $parts[0] < 240))
return false;
if (($parts[0] == 192 && $parts[1] == 168) || ($parts[0] == 169 && $parts[1] == 254))
return false;
if ($parts[0] == 172 && $parts[1] > 15 && $parts[1] < 32)
return false;
return true;
}
/**
* Return contents of given file as string, but only read up to maxBytes bytes.
*
* @param string $file file to read
* @param int $maxBytes maximum length to read
* @return boolean success or failure
*/
public static function readFile($file, $maxBytes = 1000)
{
$fh = @fopen($file, 'rb');
if ($fh === false)
return false;
$data = fread($fh, $maxBytes);
fclose($fh);
return $data;
}
}