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第 3 章 String 字符串操作
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第 3 章 String 字符串操作
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第 3 章 String 字符串操作
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3.1. 英文大小写
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1.将字符串转换成小写
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2.将字符转成大写
strtoupper(): 该函数的作用同strtolower函数相反,是将传入的字符参数的字符全部转换成大写,并以大写的形式返回这个字符串.用法同strtolowe()一 样.
3.将字符串首字符转换成大写
ucfirst(): 该函数的作用是将字符串的第一个字符改成大写,该函数返回首字符大写的字符串.用法同strtolowe()一样.
4.将字符串每个单词的首字符转换成大写
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