分支，循环，流程控制

实例演示分支与循环, 不要抄源码 2. 实例演示流程控制之模板语法, 自己测试switch

1.分支

1.1分支

if($count > 0)
{
 if($count == 1)
 {
     echo '1' . PHP_EOL;
 }
 elseif ($count == 2)
 {
     echo '2' . PHP_EOL;
 }
 else
 {
     echo '3' . PHP_EOL;
 }
}

1.2语法糖

目标：判断大人小孩

$age = 20;
$person = $age > 18 ? '大人' : '小孩';
echo $person . PHP_EOL;

2.循环

2.1switch循环

目标：判断是否及格

$m = 100;
switch ($m)
{
    case $m<60:
        echo '不及格';
        break;
    default:
        echo '及格';
}

2.2 while循环

目标：输出0-9

$y = 10;
do{
    echo $GLOBALS['y'];
    static $count = 0;
    echo $count . " ";
    $count++;
}while($count < 10);

2.3 for循环

目标：屏幕上输出颜色

$color = ['red','blue','green'];
$list = '<ul style="border:1px solid red ;">';
for($i = 0;$i < count($color);$i++)
{
    $list .= "<li>$color[$i]</li>";
}
$list .= '</ul>';
echo $list;

2.4 foreach循环

目标：遍历数组

$person = ['name' => 'yk','wight' => 60];
echo $person;
foreach ($person as $key => $value)
{
    echo $key . ' ' . $value;
}

3.模板语法

3.1普通写法

<?php
$users = [
    ['1','吴昊','0',22],
    ['2','吴啊','1',23],
    ['3','爱昊','0',25],
]
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
</head>
<style>
    th,td{
        border: 1px solid gray;
        margin: 0;
    }
</style>
<body>
<table style="border: 1px solid green;">
    <caption>学生体检表</caption>
    <thead>
    <tr>
        <th>ID</th>
        <th>姓名</th>
        <th>性别</th>
        <th>年龄</th>
    </tr>
    </thead>
    <tbody>
    <?php
    foreach ($users as $user)
    {
        echo '<tr>';
        echo "<td>$user[0]</td>";
        echo "<td>$user[1]</td>";
        $sex = $user[2] ? '男' : '女';
        echo '<td>'. $sex .'</td>';
        echo "<td>$user[3]</td>";
        echo '</tr>';
    }
    ?>
    </tbody>
</table>
</body>
</html>

3.2模板写法

<?php
$users = [
    ['1','吴昊','0',22],
    ['2','吴啊','1',23],
    ['3','爱昊','0',25],
]
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
</head>
<style>
    th,td{
        border: 1px solid gray;
        margin: 0;
    }
</style>
<body>
<table style="border: 1px solid green;">
    <caption>学生体检表</caption>
    <thead>
    <tr>
        <th>ID</th>
        <th>姓名</th>
        <th>性别</th>
        <th>年龄</th>
    </tr>
    </thead>
    <tbody>
    <?php
    foreach ($users as $user):
     ?>
         <tr>
         <td><?=$user[0]?></td>
         <td><?=$user[1]?></td>
        <?php
        $sex = $user[2] ? '男' : '女';
        ?>
         <td><?=$sex?></td>
         <td><?=$user[3]?></td>
         </tr> 
    <?php
    endforeach;
    ?>
    </tbody>
</table>
</body>
</html>

1.分支

1.1分支

1.2语法糖

2.循环

2.1switch循环

2.2 while循环

2.3 for循环

2.4 foreach循环

3.模板语法

3.1普通写法

3.2模板写法

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