php 中htmlentities导致中文无法查询问题

 $str = "John & 'Adams'"; 
 echo htmlentities($str, ENT_COMPAT); 
 echo " 
 "; 
 echo htmlentities($str, ENT_QUOTES); 
 echo " 
 "; 
 echo htmlentities($str, ENT_NOQUOTES); 
 ?> 
 
John & 'Adams'
 John & 'Adams'
 John & 'Adams'

$str = "John & 'Adams'"; 
 echo htmlspecialchars($str, ENT_COMPAT); 
 echo " 
 "; 
 echo htmlspecialchars($str, ENT_QUOTES); 
 echo " 
 "; 
 echo htmlspecialchars($str, ENT_NOQUOTES); 
 ?>  

$str = '<a href="demo.php?m=index&a=index&name=中文" rel="external nofollow" rel="external nofollow" >测试页面</a>';

$str = '<a href="demo.php?m=index&a=index&name=中文" rel="external nofollow" rel="external nofollow" >测试页面</a>';