PHP二维数组与空项 [英] PHP two-dimensional array with empty items

问题描述

有了另一个用户的很多帮助，我来到了点，我得到我想要的二维数组。我得到的每个ID（$ talente）从CSV保存一行。像数组的charm一样工作。

这是我使用的CSV：

c。Schild，1，Licht，1w10， -
Schutz，1，Licht，1w10， -
Licht，4，Licht，1w10， -
Genesung，1，Licht，
Aufopfern，1，Licht， - ， -

脚本：

 <？php 
 
 $ talente = $ _GET ['talente']; 
 
 $ myFile = fopen（talente.csv，r）; 
 $ csv = []; 
 while（$ data = fgetcsv（$ myFile，1000，，））{
 $ csv [] = $ data; 
} 
 fclose（$ myFile）; 
 
 $ talentline = array_filter（$ csv，function（$ i）use（$ talente）{
 return in_array（$ i，$ talente）; 
}，ARRAY_FILTER_USE_KEY）; 
 
 
 print_r（array_values（$ talentline））; 
 
 echo $ talentline [1] [0]; 
 echo $ talentline [2] [0]; // line 21. 
 echo $ talentline [3] [0]; 
 
？> 
  

print_r（array_values（$ talentline））;给我以下输出id的1& 3.

  [0] => Array（
 [0] => Schutz 
 [1] => 1 
 [2] => Licht 
 [3] => 1w10 
 [4] =>  -  
）
 [1] => Array（
 [0] => Genesung 
 [1] => 1 
 [2] => Licht 
 [3] =>  -  
 [4] =>  -  
）
  

：

Schutz
注意：未定义的偏移量：2在C：\ xampp\htdocs\DvC Generator \php \test.php on line 21
Genesung

有两个问题，我无法解决。第一个是，打印的线条是我期望的一行之后。因此，我希望Schild，而不是Schutz。

更大的问题是，脚本将行保存在array-position等于ID。这不是我需要的，因为它也保存空数组元素。我希望的结果是当发送ID 1和3时，数组[0]处的Schild和数组[1]处的Licht。

我希望我能够解释得很好。

解决方案

数组值开始计数 0

所以零是第一个，1是秒。

您的未定义偏移问题是由于您只是保留在 $ _ GET ['talente '] 输入数组。如果您将此值更改为 2 ，那么您将会得到1和3等的未定义偏移通知。

第一个问题是数组从 [0] 开始，所以如果在 talentline 数组中有两个值，是键 [0] ，第二个值是键 [1] 。等等。

您的第二个问题与此相关，因为您要比较匿名函数中的键值，您正在查找第一个值（数组键<$ c $ $ _ GET 给出的值 1 c>数组。

解决方案：

对于第二个问题（这是一个编码错误）：

您需要通过将键值增加+1或将输入参考值减少-1来调整键值，以使输入与给定的CSV值一致：

  return in_array（$ i，$ talente--）; //将输入比较值减小1，
 //，以便将第一个值（1）视为键0。 
 

其次，
要解决通过引用未设置的数组引用脚本：

 打印isset（$ talentline [2] [0]）？ $ talentline [2] [0]; ：; 
 //简写PHP说明如果值设置然后打印它，
 //否则不打印任何东西。 
  
 
 
 
 
 
 
代码我用来达到这个答案.2）。显然，由于我没有要导入的CSV文件等而进行调整。
 <？php 
 $ talente = array（0 => 1,1 => 3）; 
 
 $ csv [] = array（0 =>Schild，1 => 1，2 =>Licht，3 =>1w10，4 = - ）; 
 $ csv [] = array（0 =>Schutz，1 => 1,2 =>Licht，3 =>1w10，4 => - ）; 
 $ csv [] = array（0 =>Licht，1 => 4，2 =>Licht，3 =>1w10，4 = 
 $ csv [] = array（0 =>Genesung，1 => 1,2 =>Licht，3 => - ，4 = 
 $ csv [] = array（0 =>Aufopfern，1 => 1,2 =>Licht，3 => - ，4 = 
 
 $ talentline = array_filter（$ csv，function（$ i）use（$ talente）{
 return in_array（$ i，$ talente--）; 
}，ARRAY_FILTER_USE_KEY ）; 
 $ talentline = array_filter（$ talentline）; 
 
 print_r（array_values（$ talentline））; 
 
 print isset（$ talentline [1] [0]）？ $ talentline [1] [0]; ：; 
 print isset（$ talentline [2] [0]）？ $ talentline [2] [0]; ：; 
 print isset（$ talentline [3] [0]）？ $ talentline [3] [0]; ：; 
  
 
With a lot of help of another user I came to the point that I get the two-dimensional array I desired. Every ID i get ($talente) saves a line from the CSV. Works like a charm for the array. But the output confuses me.

This is the CSV I use:
Schild,1,Licht,1w10,-
Schutz,1,Licht,1w10,-
Licht,4,Licht,1w10,-
Genesung,1,Licht,-,-
Aufopfern,1,Licht,-,-
The script:
<?php

$talente = $_GET['talente'];

$myFile = fopen("talente.csv", "r");
$csv = [];
while ($data = fgetcsv($myFile, 1000, ",")) {
    $csv[] = $data;
}
fclose($myFile);

        $talentline = array_filter($csv, function($i) use ($talente) {
            return in_array($i, $talente);
        }, ARRAY_FILTER_USE_KEY);


print_r(array_values($talentline));

echo $talentline[1][0];
echo $talentline[2][0];    //line 21.
echo $talentline[3][0];

?>
print_r(array_values($talentline)); gives me the following output for the id's 1 & 3. 
[0] => Array (
    [0] => Schutz
    [1] => 1
    [2] => Licht
    [3] => 1w10
    [4] => -
    )
[1] => Array (
    [0] => Genesung
    [1] => 1
    [2] => Licht
    [3] => -
    [4] => -
    )
The three echos at the end give me this:

  
Schutz
    Notice: Undefined offset: 2 in C:\xampp\htdocs\DvC Generator\php\test.php on line 21
    Genesung
There are two issues I can't work out. The first one is, that the printed lines are one line after the one I'd expect. So instead of "Schutz" I'd expect "Schild".

The bigger issue I have is, that the script saves the line at the array-position equal to the ID. That's not what I need, because it saves empty array elements as well. My desired outcome would be Schild at array[0] and Licht at array[1] when the IDs 1 and 3 were send.

I hope I could explain it well enough.
解决方案
Array values start counting at 0

So zero is first, and 1 is second. 

Your issue of "undefined Offset" is caused because you are only "keeping" the array values that are found in the $_GET['talente'] input array. If you change this value to 2 then you will get undefined offset notices for 1 and 3, etc. 

Your First issue is that arrays start at [0] so if you have two values in the new talentline array then the first is key [0] and the second value is key [1]. etc. 

Your second issue is related in that because you're comparing the key values in the anonymous function, you are looking for the first value (array key [0]) by asking for value number 1 as given by the $_GET array. This is why it's giving you the uexpected (but correct) results.

Solutions:

For the second issue (which is a coding bug):

You need to adjust the key value by either increasing the key values by +1 or to decrease the input reference values by -1, to make the input align with the given CSV values:
return in_array($i, $talente--); //reduces the input comparison value by 1, 
         //so that the first value ("1") is treated as key "0".
Second, 
To fix the notice you get from referencing an unset array reference later in the script: 
print isset($talentline[2][0]) ? $talentline[2][0]; : ""; 
// shorthand PHP stating that if value is set then print it, 
// else don't print anything.




Code I used to reach this answer (PHP 5.6.2). Obviously, adjusted as I don't have your CSV file to import, etc. 
<?php
$talente = array(0=>1,1=>3);

$csv[] = array(0=>"Schild", 1=>1, 2=>"Licht", 3=>"1w10", 4=>"-");
$csv[] = array(0=>"Schutz", 1=>1, 2=>"Licht", 3=>"1w10", 4=>"-");
$csv[] = array(0=>"Licht", 1=>4, 2=>"Licht", 3=>"1w10", 4=>"-");
$csv[] = array(0=>"Genesung",1=>1,2=>"Licht",3=>"-",4=>"-");
$csv[] = array(0=>"Aufopfern",1=>1,2=>"Licht",3=>"-",4=>"-");

        $talentline = array_filter($csv, function($i) use ($talente) {
            return in_array($i, $talente--);
        }, ARRAY_FILTER_USE_KEY);
        $talentline = array_filter($talentline);

print_r(array_values($talentline));

print isset($talentline[1][0]) ? $talentline[1][0]; : ""; 
print isset($talentline[2][0]) ? $talentline[2][0]; : ""; 
print isset($talentline[3][0]) ? $talentline[3][0]; : ""; 


                        
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