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php基础，这个程序为什么显示空白页，那里错了？怎么让它输出排序后的结果

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Release： 2016-06-13 11:42:35
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php基础，这个程序为什么显示空白页，那里错了？如何让它输出排序后的结果

本帖最后由 u013071929 于 2013-12-11 22:59:16 编辑 
<?php<br />$prodects = array(array('TIR','Tires',100),<br />		  array('OIL','Oil',10),<br />	  	  array('SPK','Spark plugs',4));<br /><br />function compare($x,$y)<br />{<br />	if($x[1] == $y[1]) //这里的x[1]和y[1]代表什么值？<br />	{<br />		return 0;<br />	}else if($x[1]<$y[1])<br />	{<br />		return -1;<br />	}else<br />	{<br />		return 1;<br />	}<br />}<br />usort($products,'compare');<br /><br />foreach($products as $key)<br />{<br />	echo '|'.$key.'|';<br />}<br />echo "<br />";<br />?><br />
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php基础，这个程序为什么显示空白页，那里错了？如何让它输出排序后的结果，
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