get rid of more functions

Signed-off-by: Michael Kaufmann <d00p@froxlor.org>

lib/Froxlor/PhpHelper.php

@@ -37,6 +37,34 @@ class PhpHelper
 		}
 	}
 
+	/**
+	 * Function randomStr
+	 *
+	 * generate a pseudo-random string of bytes
+	 *
+	 * @param int $length
+	 *
+	 * @return string
+	 */
+	public static function randomStr($length)
+	{
+		if (version_compare(PHP_VERSION, '7.0.0') >= 0) {
+			return random_bytes($length);
+		} elseif (function_exists('openssl_random_pseudo_bytes')) {
+			return openssl_random_pseudo_bytes($length);
+		} else {
+			$pr_bits = '';
+			$fp = @fopen('/dev/urandom', 'rb');
+			if ($fp !== false) {
+				$pr_bits .= @fread($fp, $length);
+				@fclose($fp);
+			} else {
+				$pr_bits = substr(rand(time(), getrandmax()) . rand(time(), getrandmax()), 0, $length);
+			}
+			return $pr_bits;
+		}
+	}
+
 	/**
 	 * Return human readable sizes
 	 *
@@ -46,8 +74,9 @@ class PhpHelper
 	 *        	maximum unit
 	 * @param string $system
 	 *        	'si' for SI, 'bi' for binary prefixes
-	 *
-	 * @param string
+	 *        	
+	 * @param
+	 *        	string
 	 */
 	public static function size_readable($size, $max = null, $system = 'si', $retstring = '%01.2f %s')
 	{