PHP如何实现类转换字符的单个大写或小写？

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php=64 && $ascii <=91) return true; return false; }}

基本操作

[PHP]代码

<?php /* * * @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 ); } }