druapl variable instance example 2015-3-18

说实话 不知道为什么会有不同的编码
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$a = urlencode('http://example.com/foo?a=b');

==== http%3A%2F%2Fexample.com%2Ffoo%3Fa%3Db  其中空格是+号

$url = url('node/34',array('query'=>array('a'=>'b c')));

==== D:phpStudyWWWdrupal/node/34?a=b%20c 空格是%20

$url = url('node/34',array('query'=>array('a'=>'b')));

==== D:phpStudyWWWdrupal/node/34?a=b