我从长时间的组合查询和文件读取过程中生成了三个字符串，每个字符串都相互关联。
例：
$versions = "1 2 5 4 10 6 8 7 3 9";
$weights = "50.2 60.5 35 10 15.98 60 50 60.1 70 75";
$ids = "512 318 112 326 155 191 977 961 943 441";
我想根据版本号按升序对它们进行排序。
示例结果：
$versions = "1 2 3 4 5 6 7 8 9 10";
$weights = "50.2 60.5 70 10 35 60 60.1 50 75 15.98";
$ids = "512 318 943 326 112 191 961 977 441 155";
我的问题是：有没有比我目前更有效的方法？
请注意，这些字符串可能会变大，到目前为止我见过的最大字符串是~600个不同的版本
我执行以下操作：
- 分解字符串
- 复制以版本号作为键的数组
- 按键对数组进行排序
- 内爆琴弦
下面是代码和一个实时示例：
$versions = "1 2 5 4 10 6 8 7 3 9";
$weights = "50.2 60.5 35 10 15.98 60 50 60.1 70 75";
$ids = "512 318 112 326 155 191 977 961 943 441";
$a_versions = explode(" ", $versions);
$a_weights = explode(" ", $weights);
$a_ids = explode(" ", $ids);
$s_versions = array();
$s_weights = array();
$s_ids = array();
//set keys to correspond to version number
foreach($a_versions as $key => $ver){
$s_versions[$ver] = $a_versions[$key];
$s_weights[$ver] = $a_weights[$key];
$s_ids[$ver] = $a_ids[$key];
}
//sort according to keys
ksort($s_versions, SORT_NUMERIC);
ksort($s_weights, SORT_NUMERIC);
ksort($s_ids, SORT_NUMERIC);
//implode back
$versions = implode(" ", $s_versions);
$weights = implode(" ", $s_weights);
$ids = implode(" ", $s_ids);
echo "
<pre>
$versions
$weights
$ids
</pre>
";
/*==========
Results
1 2 3 4 5 6 7 8 9 10
50.2 60.5 70 10 35 60 60.1 50 75 15.98
512 318 943 326 112 191 961 977 441 155
==========*/
性能提升 #1：
用 array_combine 替换 foreach 循环可能会带来一点性能提升。
事实上，根据一个简单的单元测试，它的速度提高了大约 11-15%。
这是我能找到的最好的：
$versions = array_flip(explode(' ', $versions));
$weights = explode(' ', $weights);
$ids = explode(' ', $ids);
ksort($versions, SORT_NUMERIC);
foreach ($versions as $version => $idx) {
$result[0][] = $version;
$result[1][] = $weights[$idx];
$result[2][] = $ids[$idx];
}
return array(
implode(' ', $result[0]),
implode(' ', $result[1]),
implode(' ', $result[2]),
);
看：http://codepad.viper-7.com/flcvnO比较我测试的内容(包括您的初始代码和带有array_combine的代码(
这是另一种方法。这是最简单的示例，没有键：
$versions = "1 2 5 4 10 6 8 7 3 9";
$weights = "50.2 60.5 35 10 15.98 60 50 60.1 70 75";
$ids = "512 318 112 326 155 191 977 961 943 441";
$a_versions = explode(" ", $versions);
$a_weights = explode(" ", $weights);
$a_ids = explode(" ", $ids);
$version_weight_id = array_map(null, $a_versions, $a_weights, $a_ids);
print_r($version_weight_id);
如果你想要更键控的东西，你必须有一个地图函数，如下所示：
function version_weight_id($v, $w, $id) {
return array('version' => $v, 'weight' => $w, 'id' => $id);
}
$versions = "1 2 5 4 10 6 8 7 3 9";
$weights = "50.2 60.5 35 10 15.98 60 50 60.1 70 75";
$ids = "512 318 112 326 155 191 977 961 943 441";
$a_versions = explode(" ", $versions);
$a_weights = explode(" ", $weights);
$a_ids = explode(" ", $ids);
$version_weight_id = array_map('version_weight_id', $a_versions, $a_weights, $a_ids);
array_multisort($version_weight_id, $a_versions);
print_r($version_weight_id);
编辑：
这是另一种不需要映射函数的方法：
$versions = "1 2 5 4 10 6 8 7 3 9";
$weights = "50.2 60.5 35 10 15.98 60 50 60.1 70 75";
$ids = "512 318 112 326 155 191 977 961 943 441";
$a_versions = explode(" ", $versions);
$a_weights = explode(" ", $weights);
$a_ids = explode(" ", $ids);
$weights_ids = array_map(null, $a_weights, $a_ids);
$versions_weights_ids = array_combine($a_versions, $weights_ids);
print_r($versions_weights_ids);
问题是你必须知道主键是版本，子数组 0 键是权重，子数组 1 键是 id。
要打印出结果，请使用：
foreach($versions_weights_ids as $version => $weight_id) {
echo "
<pre>
$version
{$weight_id[0]}
{$weight_id[1]}
</pre> ";
}
如果您正在寻找ajax解决方案，我会考虑JSON，并使用更像以下内容的内容：
$versions = "1 2 5 4 10 6 8 7 3 9";
$weights = "50.2 60.5 35 10 15.98 60 50 60.1 70 75";
$ids = "512 318 112 326 155 191 977 961 943 441";
$a_versions = explode(" ", $versions);
$a_weights = explode(" ", $weights);
$a_ids = explode(" ", $ids);
$weights_ids = array_map(null, $a_weights, $a_ids);
$versions_weights_ids = array_combine($a_versions, $weights_ids);
echo json_encode($versions_weights_ids);
这样，您可以使用框架的每个方法或目标特定版本(或多个版本(进行输出。