实例演示字符串函数

//md5()两个参数
//1.要计算的字符串
//2.可选,true,md5返回16字符长度的2进制,默认false,返回32字符的16进制数
echo md5('你好545'), '<br>';
echo md5('你好545', true);

$str = "Hello world. (can you hear me?)";
echo quotemeta($str);
//返回 Hello world\. \(can you hear me\?\)

$shuffled = str_shuffle('abcdef');
echo $shuffled;

echo strrev("Hello world!");

$text = 'This is a test';
echo substr_count($text, 's'); // 3
echo substr_count($text, 's', 5); // 2,从第6个开始计算,只有两个s

$foo = ucfirst('hello world!');
echo $foo;

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