PHP Common Face questions (4)

1, there are the following html:
1) using JS to obtain the ________ method to obtain the object;
2) The attribute value of the property title is obtained with the ________ property;
3) The attribute value of attribute Sina_title is obtained by ________ method;

(1) document.getElementById ('img1');(2) document.getElementById (' img1'). getattribute ('title' ) );(3) document.getElementById ('img1'). getattribute (  'sina_title');

2, the difference between Rawurlencode and UrlEncode function is __________________;

The former pair of spaces will be escaped to +, the latter will be escaped to the space is 16 binary number(%)

3, PHP filter the function of HTML is _______, escaped function is ____________;

Htmlspecialchars ()  decode_htmlspecialchars ()

PHP Common Face questions (4)