你是不是在保存的时候过滤过了？应该是保存以前用htmlspecialchars函数了。
htmlspecialchars函数把'&' (ampersand) becomes '&' '"' (double quote) becomes '"' when ENT_NOQUOTES is not set. ''' (single quote) becomes ''' only when ENT_QUOTES is set. '<' (less than) becomes '<' '>' (greater than) becomes '>'
htmlspecialchars函数把'&' (ampersand) becomes '&' '"' (double quote) becomes '"' when ENT_NOQUOTES is not set. ''' (single quote) becomes ''' only when ENT_QUOTES is set. '<' (less than) becomes '<' '>' (greater than) becomes '>'
$url = html_entity_decode($url);