我有一个大问题,我找不到任何对数组条目进行排序的方法。我的代码:
<?php
error_reporting(0);
$lines=array();
$fp=fopen('file.txt, 'r');
$i=0;
while (!feof($fp))
{
$line=fgets($fp);
$line=trim($line);
$lines[]=$line;
$oneline = explode("|", $line);
if($i>30){
$fz=fopen('users.txt', 'r');
while (!feof($fz))
{
$linez=fgets($fz);
$linez=trim($linez);
$lineza[]=$linez;
$onematch = explode(",", $linez);
if (strpos($oneline[1], $onematch[1])){
echo $onematch[0],$oneline[4],'<br>';
}
else{
}
rewind($onematch);
}
}
$i++;
}
fclose($fp);
?>
问题是,我想对被 $oneline[4] 回显的项目进行排序。我尝试了来自stackoverflow的其他几个帖子 - 但无法找到解决方案。
您的问题是,为了对似乎包含字符串值的$oneline[4]
进行排序,您需要应用以下步骤:
- 将字符串拆分为数组 (
$oneline[4] = explode(',', $oneline[4])
) - 对生成的数组进行排序 (
sort($oneline[4])
) - 将数组合并为字符串 (
$oneline[4] = implode(',', $oneline[4])
)
正如我得到的印象,变量命名在优先级列表中很低,我正在重用$oneline[4]
变量。主要是为了澄清我指的是代码的哪一部分。
话虽如此,如果你想与未来的自己交谈,你应该做其他改进(以防你需要在几个月内处理这段代码)
- 选择一种编码风格并坚持下去,原始代码看起来像是从至少 4 个不同的来源复制/粘贴的(主要是不一致的引号和大括号)
- 尝试限制重复的昂贵操作,例如尽可能打开文件(公平地说,
agents.data
可能包含 31 行,users.txt
只会打开一次,导致我看起来像个傻瓜)
我已经更新了您的代码示例,以尝试显示我所说的上述要点的含义。
<?php
error_reporting(0);
$lines = array();
$users = false;
$fp = fopen('http://20.19.202.221/exports/agents.data', 'r');
while ($fp && !feof($fp)) {
$line = trim(fgets($fp));
$lines[] = $line;
$oneline = explode('|', $line);
// if we have $users (starts as false, is turned into an array
// inside this if-block) or if we have collected 30 or more
// lines (this condition is only checked while $users = false)
if ($users || count($lines) > 30) {
// your code sample implies the users.txt to be small enough
// to process several times consider using some form of
// caching like this
if (!$users) {
// always initialize what you intend to use
$users = [];
$fz = fopen('users.txt', 'r');
while ($fz && !feof($fz)) {
$users[] = explode(',', trim(fgets($fz)));
}
// always close whatever you open.
fclose($fz);
}
// walk through $users, which contains the exploded contents
// of each line in users.txt
foreach ($users as $onematch) {
if (strpos($oneline[1], $onematch[1])) {
// now, the actual question: how to sort $oneline[4]
// as the requested example was not available at the
// time of writing, I assume
// it to be a string like: 'b,d,c,a'
// first, explode it into an array
$oneline[4] = explode(',', $oneline[4]);
// now sort it using the sort function of your liking
sort($oneline[4]);
// and implode the sorted array back into a string
$oneline[4] = implode(',', $oneline[4]);
echo $onematch[0], $oneline[4], '<br>';
}
}
}
}
fclose($fp);
我希望这不会冒犯你太多,只是试图提供帮助,而不仅仅是为手头的问题提供解决方案。