如何从PHP中的值数组中排序特定的字符串？

问题描述：

$array = array("2011-September_38","2011-June_4","2010-November_9","2011-November_29","2010-December_19");

i want to sort this array strings as following, it should sort the year first, then it should sort the month,

DESIRED OUTPUT

Array ( [0] => 2010-Marh_19 
        [1] => 2010-November_9 
        [2] => 2011-June_4 
        [3] => 2011-September_38
        [4] => 2011-November_29 )

I've tried something, could anyone bind my function to sort year then month http://codepad.org/skEiUkTC

答

Try this code:

<?php
$array = array("2011-September_38","2011-June_4","2010-November_9","2011-November_29","2010-December_19");
function monthCompare($a, $b) {
   $da = strtotime(strstr($a, '_', true));
   $db = strtotime(strstr($b, '_', true));
   return $da > $db;
}
usort($array, "monthCompare");
print_r($array);
?>

OUTPUT

Array
(
    [0] => 2010-November_9
    [1] => 2010-December_19
    [2] => 2011-June_4
    [3] => 2011-September_38
    [4] => 2011-November_29
)

答

So a simple solution to this, is to turn each of the values into a objects with DateTime::createFromFormat, sort them, and then outputting the values again.

Before i saw this question i had never played with DateTime objects, but they are awesome and easy to work with, and createFromFormat makes perfectly sense.

$array = array("2011-September_30","2011-June_4","2010-November_9","2011-November_29","2010-December_19");

foreach($array as $item)
{
    $timestamps[] = DateTime::createFromFormat('Y-F_d',$item);
}

sort($timestamps);

foreach($timestamps as $timestamp)
{
    $newarray[] = $timestamp->format('Y-F_d');
}

will give you

Array
(
    [0] => 2010-November_09
    [1] => 2010-December_19
    [2] => 2011-June_04
    [3] => 2011-September_30
    [4] => 2011-November_29
)

如何从PHP中的值数组中排序特定的字符串？

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