Question

我有一个这样的数组：

 $lessonOptions=array();
 $lessonOptions[0]=array("Physics","6.00","2015-01-01","-","4");
 $lessonOptions[1]=array("Physics","16.00","2015-01-01","-","2");
 $lessonOptions[2]=array("Maths","10.00","2015-07-01","-","10"); 
 $lessonOptions[3]=array("Maths","20.00","2015-07-01","-","10");

我想用一个名为optionarray的新数组创建一个输出，其中包含： **

physics 6.00 2015-01-04 -

physics 16.00 2015-01-01 -

数学10.00 2015-07-01 -

数学20.00 2015-07-07 -

我的问题是我可以看到每一行数学但只缺少一行物理。如何显示所有行？

我的实际代码是：

 $lessonGroup=$lessonOptions[0][0];
 $display=FALSE;
 $state=0;
 $nbLessons=count($lessonsOptions);

 for ($i = 0; $i<$nbLessons; $i++) 
{       
if ($i+1!=$nbLessons) $lessonGroupSuivant=$lessonOptions[$i+1][0];
else $display=TRUE;
switch ($state)
    {
    case 0 :            
        $infoLesson[$state]=$lessonOptions[$i];

    default :
        {               
        if ($lessonGroup==$lessonGroupSuivant)
            {
            $infoLesson[$state]=$lessonOptions[$i];
            $state=$state+1;
            }   
        else
            {
            $display=TRUE;
            $lessonGroup=$lessonGroupSuivant;
            $state=0;           
            }
        }
    }

if ($display==TRUE)
    {       
    //var_dump($infoLesson);

    $display=FALSE;
    }
}

我的实际数组（错误）正如你所看到的，我的数组的大小是1，我需要2，因为我有两个课程物理。

 array(1) { [0]=> array(5) { [0]=> string(31) "physics" [1]=> string(10)      "6.00" [2]=> string(10) "2015-01-01" [3]=> string(1) "-" [4]=> float(42) } } 

 array(2) { [0]=> array(5) { [0]=> string(15) "Maths" [1]=> string(11) "10.00" [2]=> string(10) "2015-07-01" [3]=> string(1) "-" [4]=> float(10) } [1]=> array(5) { [0]=> string(15) "Maths" [1]=> string(11) "10.00" [2]=> string(10) "2015-07-12" [3]=> string(1) "-" [4]=> float(10) } }

Answer 1

好吧，我想我找到了你需要的东西：

<?php
$lessonOptions=array();
$lessonOptions[0]=array("Physics","6.00","2015-01-01","-","4");
$lessonOptions[1]=array("Physics","16.00","2015-01-01","-","2");
$lessonOptions[2]=array("Maths","10.00","2015-07-01","-","10");
$lessonOptions[3]=array("Maths","20.00","2015-07-01","-","10");

$optionarray = array();

$lastLessonKey = '';
$i = 0;
foreach ($lessonOptions as $key => $data) {
    if (empty($lastLessonKey)) {
        $lastLessonKey = $data[0];
    } else if ($lastLessonKey !== $data[0]) {
        $i++;
        $lastLessonKey = $data[0];
    }

    $optionarray[$i][] = $data;
}

var_dump($optionarray);

输出：

array(2) { [0]=> array(2) { [0]=> array(5) { [0]=> string(7) "Physics" [1]=> string(4) "6.00" [2]=> string(10) "2015-01-01" [3]=> string(1) "-" [4]=> string(1) "4" } [1]=> array(5) { [0]=> string(7) "Physics" [1]=> string(5) "16.00" [2]=> string(10) "2015-01-01" [3]=> string(1) "-" [4]=> string(1) "2" } } [1]=> array(2) { [0]=> array(5) { [0]=> string(5) "Maths" [1]=> string(5) "10.00" [2]=> string(10) "2015-07-01" [3]=> string(1) "-" [4]=> string(2) "10" } [1]=> array(5) { [0]=> string(5) "Maths" [1]=> string(5) "20.00" [2]=> string(10) "2015-07-01" [3]=> string(1) "-" [4]=> string(2) "10" } } }

Answer 2

因此，您愿意按某个值对数组进行分组

$infoLesson = array();

foreach ($lessonOptions as $v) {
   $infoLesson[$v[0]][] = $v; 
}

然后，您可以按键检索数组。例如打印 $ infoLesson [＆＃39;数学＆＃39;] 将为您提供

Array
(
    [0] => Array
        (
            [0] => Maths
            [1] => 10.00
            [2] => 2015-07-01
            [3] => -
            [4] => 10
        )

    [1] => Array
        (
            [0] => Maths
            [1] => 20.00
            [2] => 2015-07-01
            [3] => -
            [4] => 10
        )

)

$ infoLesson [＆＃39; Physics＆＃39;]

Array
(
    [0] => Array
        (
            [0] => Physics
            [1] => 6.00
            [2] => 2015-01-01
            [3] => -
            [4] => 4
        )

    [1] => Array
        (
            [0] => Physics
            [1] => 16.00
            [2] => 2015-01-01
            [3] => -
            [4] => 2
        )

)

从数组值创建数组

2 个答案: