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分享请教一个二维数组排序问题
Array ( [1] => Array ( [date] => 2011-08-18 [num] => 5 ) [2] => Array ( [date] => 2011-08-20 [num] => 3 ) [3] => Array ( [date] => 2011-08-17 [num] => 10 ) )
如何按date升序重新排?
如何按date升序重新排?
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zhang-先生 2011-08-21
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多些两位大神. \(^o^)/
一起混吧 2011-08-21
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$arr=array (
'1' => array ( 'date' => '2011-08-18', 'num' => 5 ) ,
'2' => array ( 'date' => '2011-08-20', 'num' => 3 ) ,
'3' => array ( 'date' => '2011-08-17', 'num' => 10 )
) ;
foreach($arr as $v){
$tmp[$v[date]]=$v;
}
ksort($tmp);
print_r(array_values($tmp));
乌镇程序员 2011-08-21
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$ar = Array ( 1 => Array ( 'date' => '2011-08-18', 'num' => 5 ),
2 => Array ( 'date' => '2011-08-20', 'num' => 3 ),
3 => Array ( 'date' => '2011-08-17', 'num' => 10 )
);
function mysort($a, $b) {
$a = strtotime($a['date']);
$b = strtotime($b['date']);
if ($a == $b) return 0;
return ($a < $b) ? -1 : 1;
}
usort($ar, 'mysort');
print_r($ar);
/*
Array
(
[0] => Array
(
[date] => 2011-08-17
[num] => 10
)
[1] => Array
(
[date] => 2011-08-18
[num] => 5
)
[2] => Array
(
[date] => 2011-08-20
[num] => 3
)
)
*/