PHP 単一文字の大文字小文字変換クラス

基本操作

/*
 *
 * @class Base_Char
 * @author zhangys
 * @date 2012/06/25
 */

class Base_Var_Char
{
 public static function isUpper ( $char )
 {
 $ascii = ord ( $char );
 if( $ascii > 64 and $ascii < 91 ) return true;
 return false;
 }

 public static function isLower ( $char )
 {
 $ ascii = ord ( $char );
 if( $ascii > 96 and $ascii < 123 ) return true;
 return false;
 }

 public static function toUpper ( $char )
 {
 if ( self:: isUpper ( $char ) ) return $char;
 $ascii = ord ( $char );
 return chr ( $ascii - 32 );
 }

 public static function toLower ( $char )
 {
 if ( self:: isLower ( $char ) ) return $char;
 $ascii = ord ( $char );
 return chr ( $ascii + 32 );
 }
}