对于listing j示例为我们具体说明了php函数array_multisort()的工作方式:
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<OL class=dp-xml><LI class=alt><SPAN><STRONG><FONT color=#006699><SPAN class=tag><?</SPAN><SPAN class=tag-name>php</SPAN></FONT></STRONG><SPAN> </SPAN></SPAN><LI class=alt><SPAN><SPAN>$</SPAN><SPAN class=attribute><FONT color=#ff0000>data</FONT></SPAN><SPAN> = </SPAN><SPAN class=attribute-value><FONT color=#0000ff>array</FONT></SPAN><SPAN>(array("id" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 1, "name" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> "Boney M", "rating" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 3), </SPAN></SPAN><LI class=""><SPAN>array("id" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 2, "name" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> "Take That", "rating" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 1), </SPAN></SPAN><LI class=alt><SPAN>array("id" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 3, "name" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> "The Killers", "rating" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 4), </SPAN></SPAN><LI class=""><SPAN>array("id" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 4, "name" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> "Lusain", "rating" =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> 3), </SPAN></SPAN><LI class=alt><SPAN>); foreach ($data as $</SPAN><SPAN class=attribute><FONT color=#ff0000>key</FONT></SPAN><SPAN> =</SPAN><SPAN class=tag><STRONG><FONT color=#006699>></FONT></STRONG></SPAN><SPAN> $value) { </SPAN></SPAN><LI class=""><SPAN>$name[$key] = $value['name']; </SPAN><LI class=alt><SPAN>$rating[$key] = $value['rating']; </SPAN><LI class=""><SPAN>} </SPAN><LI class=alt><SPAN>array_multisort($rating, $name, $data); print_r($data);</SPAN><LI class=alt><SPAN></SPAN><SPAN class=tag><STRONG><FONT color=#006699>?></FONT></STRONG></SPAN><SPAN> </SPAN></LI></OL>这里,我们在$data数组中模拟了一个行和列数组。然后,我使用PHP函数array_multisort()对数据集合进行重排,首先是根据rating进行排序,然后,如果rating相等的话,再根据name排序。它的输出结果如下:
Array ([0] => Array
(
[id] => 2
[name] => Take That
[rating] => 1
) [1] => Array
(
[id] => 1
[name] => Boney M
[rating] => 3
)
[2] => Array
(
[id] => 4
[name] => Lusain
[rating] => 3
)
[3] => Array
(
[id] => 3
[name] => The Killers
[rating] => 4
)
)
PHP函数array_multisort()是PHP中最有用的函数之一,它有非常广泛的应用范围。另外,就如你在例子中所看到的,它能对多个不相关的数组进行排序,也可以使用其中的一个元素作为下次排序的基础,还可以对数据库结果集进行排序。
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