PHP Student Information Management System: Arrays, Looping Constructs, and Implementation Guide

The article outlines the requirements for a student information management system, emphasizing the need for administrators to view, add, and delete student records through a tabular interface.

Design ideas focus on defining basic student information and displaying it in a table.

Knowledge base covers arrays in PHP, including definitions, creation using square brackets or the array() function, and various array types such as indexed, associative, mixed, multidimensional, and irregular arrays.

Examples of array definitions are provided:

<code>$变量名 = [元素1,元素2,元素3];</code><code>$info = ['PHP中文网','PHP','数组'];</code>

<code>$变量名 = array(元素1,元素2,元素3);</code><code>$info = array('PHP中文网','PHP','数组');</code>

<code>$变量名[] = 值1; // 自动生成下标</code><code>$info[] = 'PHP中文网';</code><code>$变量名[下标] = 值;</code><code>$info[1] = 'PHP';</code>

Array types are illustrated with sample code, e.g., an indexed array:

<code>$arr = array(0=>'PHP中文网', 1=>'PHP 教程', 2=>'PHP 数组', 3=>'http://www.php.cn');</code>

and an associative array:

<code>$arr = array('title'=>'PHP中文网', 'course'=>'PHP 教程', 'content'=>'PHP 数组', 'url'=>'http://www.php.cn/course/php/');</code>

Looping statements in PHP— while , do...while , for , and foreach —are introduced, with a note that foreach can traverse any array type.

Examples of looping over arrays:

<code>for($i=0;$i<count($arr);$i++){
    // execute code
}</code>

<code>foreach($arr as $key=>$value){
    // execute code
}</code>

<code>foreach($arr as $value){
    // execute code
}</code>

Code implementation demonstrates defining a multidimensional array $info that stores student records (name, birthdate, subject, student number) and using a for loop to generate an HTML table displaying each student's details.

<code>$info = array(
    array('name'=>'王六','birth'=>'2003-08-07','subject'=>'PHP','snum'=>'0150427001'),
    array('name'=>'张三','birth'=>'2003-12-23','subject'=>'PHP','snum'=>'0150427002'),
    array('name'=>'赵二','birth'=>'2002-01-09','subject'=>'PHP','snum'=>'0150427003'),
    array('name'=>'孙四','birth'=>'2003-05-04','subject'=>'PHP','snum'=>'0150427004')
);
?>
<table>
    <tr><th>学号</th><th>姓名</th><th>出生日期</th><th>详情</th></tr>
    <?php for($i=0,$len=count($info);$i<$len;++$i){ ?>
    <tr>
        <td><?php echo $info[$i]['snum']; ?></td>
        <td><?php echo $info[$i]['name']; ?></td>
        <td><?php echo $info[$i]['birth']; ?></td>
        <td><a href="#">点击查看详情</a></td>
    </tr>
    <?php } ?>
</table></code>

The article concludes with a visual case demonstration of the resulting student list.