Added feature request at18988

plugins/include/string.inc

@@ -126,3 +126,16 @@ native strfind(const string[], const sub[], ignorecase=0, pos=0);
 
 /* Compares two strings with the C function strcmp().  Returns 0 on equal. */
 native strcmp(const string1[], const string2[], ignorecase=0);
+
+// tests if given string contains only digits
+stock bool:is_str_num(sString[])
+{
+    new i = 0, len = strlen(sString);
+    
+    do
+    {
+        if (!isdigit(sString[i]))
+            return false;
+    } while (i++ < len);
+    return true;
+}