迁移笔记：php截取文字的方法

php内置函数
1. iconv
iconv_set_encoding(‘internal_encoding‘, ‘UTF-8‘);
$str;  				//字符串的声明
$num=iconv_strlen($str);
$str_substr=iconv_substr($str, , );

2. mb
mb_internal_encoding(‘UTF-8‘);
$str;
$num=mb_substr($sub , , )

测试代码
	header(‘Content-Type: text/html;charset=utf-8‘);
	//iconv_set_encoding(‘internal_encoding‘, ‘UTF-8‘);
	$name="实验文字！实验文字！实验文字！实验文字！";
	//echo $name;
	//$num=iconv_strlen($name);
	//$name=iconv_substr($name, 6, 2);
	//echo $name;
	//echo $num;
	mb_internal_encoding(‘UTF-8‘);
	$num = mb_strlen($name);
	$name = mb_substr($name, 5);
	echo "<br>".$name;
	echo $num;