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  下面小结PHP中的几个字符函数，小结一下： 1）ucfirst    将首字母变大写，比如   $string = "this is my web development blog"; echo ucfirst($string); // Output: This is my web development blog 2) lcfirst,将首字母变小写    $string = "This is my Web Development Blog"; echo lcfirst($string); // Output: this is my Web Development Blog 3）strtoupper,将整个字符串变大写    $string = "this is my web development blog"; echo strtoupper($string); // Output: THIS IS MY WEB DEVELOPMENT BLOG 4） strtoplower，将整个字符串变小写    $string = "tHiS is mY WeB DevElOpMenT bLoG"; echo strtolower($string); // Output: this is my web development blog 5）ucwords(),可以将句子中每个单词的第一个字母变大写，比如    $string = "this is my web development blog"; echo ucwords($string); // Output: This Is My Web Development Blog

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