iconv函数

<?php 
echo $str= '你好,这里是卖咖啡!'; 
echo '<br />'; 
echo iconv('GB2312', 'UTF-8', $str); //将字符串的编码从GB2312转到UTF-8 
echo '<br />'; 
echo iconv_substr($str, 1, 1, 'UTF-8'); //按字符个数截取而非字节 
print_r(iconv_get_encoding()); //得到当前页面编码信息 
echo iconv_strlen($str, 'UTF-8'); //得到设定编码的字符串长度 
//也有这样用的 
$content = iconv("UTF-8","gbk//TRANSLIT",$content); 
?>