很难解释这里的例子:
$strings = array(
array("languageCode" => "ES", "string" => "hola"),
array("languageCode" => "EN", "string" => "hello"),
array("languageCode" => "IT", "string" => "ciao"),
array("languageCode" => "CHS", "string" => "您好"),
);
我想通过定义顺序来按languageCode
值对字符串进行排序:
function magicStringOrder(array $strings, array $languageCodeOrder){
// ....
return $strings;
}
$strings = magicStringOrder($strings, array('EN', 'IT') );
$strings = array(
array("languageCode" => "EN", "string" => "hello"),
array("languageCode" => "IT", "string" => "ciao"),
array("languageCode" => "ES", "string" => "hola"),
array("languageCode" => "CHS", "string" => "您好"),
);
有magicStringOrder
?
我现在知道用一些循环解决这个问题很简单。我需要一个非常快的函数(它被称为很多次,有大数组)
答案 0 :(得分:2)
没有php排序功能的另一个想法:
// sort by cmp $arr[$magic_key] <-> arr $magic_order
function magicSort($arr, $magic_key="", $magic_order = array())
{
$sorted = array();
foreach($magic_order AS $v) {
foreach($arr AS $k2 => $v2) {
if($v===$v2[$magic_key]) {
$sorted[] = $v2;
unset($arr[$k2]);
}
}
}
// attach what's left
return array_merge($sorted, $arr);
}
Test it at eval.in(链接即将过期)
$strings = array(
array("languageCode" => "ES", "string" => "hola"),
array("languageCode" => "EN", "string" => "hello"),
array("languageCode" => "IT", "string" => "ciao"),
array("languageCode" => "CHS", "string" => "??"),
);
print_r(magicSort($strings, "languageCode", array("EN", "IT")));
输出到:
Array
(
[0] => Array
(
[languageCode] => EN
[string] => hello
)
[1] => Array
(
[languageCode] => IT
[string] => ciao
)
[2] => Array
(
[languageCode] => ES
[string] => hola
)
[3] => Array
(
[languageCode] => CHS
[string] => 您好
)
)
$magic_order
也可以为空。如果是这样,阵列只是重新编制索引。 <{1}}中不存在的具有值的数组将向下移动,并保持其顺序。
不确定,如果这正是您所需要的。
答案 1 :(得分:1)
如果给一种语言赋予权重不是问题,那么排序会变得更容易,因此更快。
您可以使用asort
根据$languageCodeOrder
存储的权重对数组进行排序。如果$languageCodeOrder
其权重中不存在的语言变为0并且朝向有序数组的末尾。
阵列的最终顺序将从高重量到低重量。也就是说:如果EN的权重为1,它将在具有2的IT之后出现在数组中。
$strings = array(
array("languageCode" => "ES", "string" => "hola"),
array("languageCode" => "EN", "string" => "hello"),
array("languageCode" => "IT", "string" => "ciao"),
array("languageCode" => "CHS", "string" => "您好"),
);
function magicStringOrder(array $strings, array $languageCodeOrder) {
uasort($strings, function($a,$b) use ($languageCodeOrder) {
$val_a = (isset($languageCodeOrder[$a["languageCode"]])) ? $languageCodeOrder[$a["languageCode"]] : 0;
$val_b = (isset($languageCodeOrder[$b["languageCode"]])) ? $languageCodeOrder[$b["languageCode"]] : 0;
return $val_b - $val_a;
});
return $strings;
}
$strings_ordered = magicStringOrder($strings, array('EN' => 1, 'IT' => 2, 'ES' => 3, 'CHS' => 4));
print_r($strings_ordered);
如果阵列很大,最好依靠PHP排序算法而不是尝试实现自定义算法。
随意修改算法中的任何内容(顺序或其他)。