PHP分组和LOOPS

Question

我如何按照技能对此进行分组，然后按照每种技能回显所有照片。

SELECT skills.teacher, skills.student, skills.skill, profile.photo 
FROM skills 
INNER JOIN profile ON skills.student = profile.username 
WHERE teacher = 'teach1' 

teacher | student | skill | photo 
------- | -------- | ------ | ------------ 
teach1 | student1 | skill1 | student1.jpg 
teach1 | student2 | skill1 | student2.jpg 
teach1 | student3 | skill2 | student3.jpg 
teach1 | student3 | skill1 | student3.jpg 
teach1 | student4 | skill3 | student4.jpg 
teach1 | student1 | skill2 | student1.jpg 

我强调这是一个例子。我实际上并不知道学生创建的“技能”的名称。我不知道会列出多少技能。我不知道用户会向什么教师添加什么技能。

我尝试while循环和foreach循环。我只是无法弄清楚如何分组这个和使用什么类型的循环...

我需要我的最终结果，让我回声。

<div>skill1 
<img src="student1.jpg"> 
<img src="student2.jpg"> 
<img src="student3.jpg"> 
... 
... 
... 
</div> 

<div>skill2 
<img src="student1.jpg"> 
<img src="student3.jpg"> 
... 
... 
... 
</div> 

<div>skill3 
<img src="student4.jpg"> 
... 
... 
... 
</div> 

Answer 1

首先，为了通过技能，这样你才能让他们：

SELECT skills.teacher, skills.student, skills.skill, profile.photo 
FROM skills 
INNER JOIN profile ON skills.student = profile.username 
WHERE teacher = 'teach1' 
ORDER BY skills.skill 

分配一个变量（在这种情况下$lastSkill）while循环之外。检查它是否已更改，并相应地输出内容。看看下面的例子。你的PHP代码看起来类似这样：

$lastSkill = null; 

while ($row = fetchrow()) 
{ 
    if ($row['skill'] !== $lastSkill) 
    { 
     //Don't close a div, if it's the first row 
     if ($lastSkill !== null) 
      echo '</div>'; 

     //We've moved onto a new row, echo it out 
     echo '<div>' . $row['skill']; 
     //Store the lastSkill 
     $lastSkill = $row['skill']; 
    } 

    echo '<img src="' . $row['photo'] . '">'; 
} 

Answer 2

SELECT skills.teacher, skills.student, skills.skill, profile.photo 
FROM skills 
INNER JOIN profile ON skills.student = profile.username 
WHERE teacher = 'teach1' Group by skills.skill order by skills.? 

**ORDER BY WHATEVER YOU WANT PUT IN PLACE OF ?.**