<HTML>
<HEAD>
<TITLE>常用字符串函数(三)</TITLE>
</HEAD>
<BODY>
<?
//颠倒字串
print("abcdefg 颠倒 ");
print(strrev("abcdefg")."<hr>");
//小写字串
print("小写: ".strtolower("Hello World")."<hr>");
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//大写字串
print("大写: ".strtoupper("Hello World")."<hr>");
//去空格
$text = " whitespace ";
print("\"" . trim($text) . "\"");
?>
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