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<?php// 流程控制：分支// 1.单分支$age = 10;if($age >= 18){echo '恭喜你，成年人';}// 2.双分支$age = 10;if($age >= 18){echo '恭喜你，成年人';}else{echo '小学生，好好学习';}echo '<hr>';// 分支只有一行代码，可以不写大括号$age = 30;if($age >= 18)echo '恭喜你，成年人';elseecho '小学生，好好学习';echo '<hr>';// 3.多分支$age = 100;if($age >= 18 && $age < 40 ){echo "{$age}岁，改结婚了";}else if($age >= 40 ) {echo "{$age}岁，好好锻炼身体";}else{echo '小学生，好好学习';}echo '<hr>';// 4.多分支的语法糖：switch$age = 25;switch(true){case $age >= 18 && $age < 40 ;echo "{$age}岁，改结婚了";break;case $age >= 40 ;echo "{$age}岁，好好锻炼身体";break;default:echo '小学生，好好学习';}
<?php// 流程控制：循环$car = ['BMW','volvo','haval'];print_r($car);echo '<br>';echo $car[2] . '<br>';// 1.初始化循环变量，用索引当循环变量$i =0;// 2.循环条件：// 数组长度 = 最大索引+1// echo count($car);if($i < count($car)){echo $car[$i] . '<br>';}// 3.更新循环条件$i =$i+1;if($i < count($car)){echo $car[$i] . '<br>';}echo '<hr>';// 简化循环改写：while()$i = 0;while($i < count($car)){echo $car[$i] . '<br>';$i =$i+1;}// 案例列表$list = '<ul style="border:1px solid;background:cyan;">';$i = 0;while($i < count($car)){$list .= "<li>{$car[$i]}</li>";$i =$i+1;}$list .= '</ul>';echo $list;echo '<hr>';$list = '<ul style="border:1px solid;background:red;">';$i = 0;do{$list .= "<li>{$car[$i]}</li>";$i =$i+1;}while($i > count($car));$list .= '</ul>';echo $list;// for改写$list = '<ul style="border:1px solid;background:yellow;">';for($i =0;$i < count($car);$i++){$list .= "<li>{$car[$i]}</li>";}$list .= '</ul>';echo $list;// 中断:break$list = '<ul style="border:1px solid;background:violet;">';for($i =0;$i < count($car);$i++){if($i >1) break;$list .= "<li>{$car[$i]}</li>";}$list .= '</ul>';echo $list;// 跳过某次循环:continue;$list = '<ul style="border:1px solid;background:violet;">';for($i =0;$i < count($car);$i++){if($i === 1) continue;$list .= "<li>{$car[$i]}</li>";}$list .= '</ul>';echo $list;
<?php$users =[['id'=>'1','name'=>'李白','course' =>'php','gender'=>0,'score'=>60],['id'=>'2','name'=>'杜甫','course' =>'mysql','gender'=>1,'score'=>30],['id'=>'3','name'=>'韩愈','course' =>'js','gender'=>0,'score'=>90],['id'=>'4','name'=>'杜牧','course' =>'php','gender'=>1,'score'=>80],];?><!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta http-equiv="X-UA-Compatible" content="IE=edge"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>php模板语法</title></head><body><table border="1" width ="500" cellspacing ="0" cellpadding="3" aling ="center"><caption>用户信息表</caption><thead><tr bgcolor = "#ccc"><th>id</th><th>姓名</th><th>课程</th><th>性别</th><th>成绩</th></tr></thead><!-- 遍历 --><tbody align="center"><?php foreach($users as $user) : ?><!-- “{” => 冒号加php结束标记 --><!-- <tr><td><?php echo $user['id'] ?></td><td><?php echo $user['name'] ?></td><td><?php echo $user['course'] ?></td><td><?php echo $user['gender']?'女' : '男' ?></td><td><?php echo $user['score'] ?></td></tr> --><!-- 仅输出成绩大于60分的 --><!-- <?php if ($user['score'] >= 60) : ?><tr><td><?php echo $user['id'] ?></td><td><?php echo $user['name'] ?></td><td><?php echo $user['course'] ?></td><td><?php echo $user['gender']?'女' : '男' ?></td><td><?php echo $user['score'] ?></td></tr><?php endif ?> --><!-- 输出全部，低于60分的标红 --><tr><td><?php echo $user['id'] ?></td><td><?php echo $user['name'] ?></td><td><?php echo $user['course'] ?></td><td><?php echo $user['gender']?'女' : '男' ?></td><?php $color = $user['score'] < 60 ?'style="color: red;"' : '' ?><td <?php echo $color ?>><?php echo $user['score'] ?></td></tr><?php endforeach ?></tbody></table></body></html>