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                            判斷數字的大小是否在某個范圍內，如果僅僅是判斷是否為數字無需使用。


~~~
 #---------------------------------------------------------- 
 # 判斷數字大小，無大小的判斷可以用系統帶的 is_numeric($str)
 #----------------------------------------------------------
 Function isNumber ($fNum, $fMin="", $fMax="") { 
  if ( eregi("^[0-9]+$", $fNum) ) { 
   if ( "" == $fMax && "" == $fMin ) { 
   Return True;
   } elseif ( "" == $fMin && $fNum <= $fMax ) { 
   Return True;
   } elseif ( "" == $fMax && $fNum >= $fMin ) { 
   Return True;
   } elseif ( $fNum >= $fMin && $fNum <= $fMax ) { 
   Return True;
   } else { 
   Return False;
   }
  } else { 
  Return False;
  }
 }
~~~
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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