如何进行向上取整，以500递增
条件：
以500递进，
规则：如现在是4200，则自动使其变成4500；如现在是4700，则变成5000；4500或者5000这种不变，请支招
------解决思路----------------------
$d = array(4200, 4700, 5000, 4500);<br /><br />foreach($d as $v) {<br /> printf("%d : %d\n", $v, ceil($v/500)*500);<br />}4200 : 4500<br />4700 : 5000<br />5000 : 5000<br />4500 : 4500<br /><br />
<br />$vl=4500;<br />$vl=((int)($vl/500))*500+($vl%500==0?0:500);<br />echo $vl;<br />
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