added format_int_0()

diff --git a/format.php b/format.php
index e158bb3..c40f55e 100644 (file)
--- a/format.php
+++ b/format.php
@@ -45,6 +45,15 @@ function format_int($str) {
        return ereg_replace('^0*([1-9])', '\1', $str);
 }
 
+# return 0 of there's no digits
+function format_int_0($str) {
+       $str = format_int($str);
+       if($str == '') {
+               return '0';
+       }
+       return $str;
+}
+
 function format_zip($str) {
        return ereg_replace('[^0-9]', '', $str);
 }