一、流程控制
①、三元运算符： 判断式?'一':'二'
②、if（条件）{语句块}else{语句块}
③、if（条件）{语句块}else if（条件）{语句块}else{语句块}
④、switch（条件）{case 1：语句；break；}
<?php
//三元运算符
$number = 1000;
echo $number>1200?'买买买':'伤不起啊';
//if-else
$num = 50;
if ($num>50){
echo '大于50';
}else{
echo '小于等于50';
}
// if elseif else
$num = 60;
if ($num>=100){
echo '可以出去玩';
}elseif ($num>=80){
echo '可以看电视';
}elseif ($num>=60){
echo '不挨打就好了，还想出去玩';
}else{
echo '狠狠揍一顿';
}
//switch
$score = 100;
switch ($score/10){
case 10:
echo '满分，干得漂亮';
break;
case 9:
echo '很优秀';
break;
case 8:
echo '良好';
break;
case 7:
case 6:
echo '合格';
break;
default:
echo '去复习吧';
break;
}二、计数循环
①、while{语句块}
②、do{语句块}（）；
③、for
<?php
//while
$int = 1;
while($int<10){
echo $int.' ';
$int++;
}
//do-while
$int = 1;
do{
echo $int;
$int++;
}while($int<1);
// for
for ($int=1;$int<10;$int++){
echo $int.' ';
}break：结束循环
continue：结束当前循环，进入下次循环
三、get传值
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <title>get传值</title> </head> <body> <form action="" method="get"> <div> <label for="username">账号</label> <input type="text" name="name" id="username" value=""> </div> <div> <label for="pwd">密码</label> <input type="password" name="pwd" id="pwd" value=""> </div> <div> <button>登录</button> </div> </form> </body> </html> <?php print_r($_GET); echo '<br>'; echo $_GET['name'].'<br>'; echo $_GET['pwd']; ?>
四、模板分离案例：
index.php
<?php require 'header.php' ;?>
<?php foreach ($cates as $cate){?>
<h2><?php echo $cate['alias'];?></h2>
<ol>
<?php foreach($movies as $movie){
if($movie['cate_id'] == $cate['cate_id']){
?>
<li><a href="detail.php?cate=<?php echo $movie['cate_id']?>"><?php echo $movie['name'];?></a></li>
<?php } }?>
</ol>
<?php }?>
<?php require 'footer.php';?>list.php
<?php include 'header.php' ?>
<?php
$cate_id = intval($_GET['cate_id']);
foreach ($cates as $cate){
if ($cate['cate_id'] == $cate_id){
?>
<h2><?php echo $cate['alias']?></h2>
<ol>
<?php
foreach ($movies as $movie){
if ($movie['cate_id'] == $cate_id){
?>
<li><a href="detail.php?mov_id=<?php echo $movie['mov_id']?>"><?php echo $movie['name']?></a></li>
<?php } }?>
</ol>
<?php } }?>
<?php include 'footer.php'?>detail.php
<?php include 'header.php'?>
<?php
$mov_id = intval($_GET['mov_id']);
foreach ($movies as $movie){
if ($movie['mov_id'] == $mov_id){
?>
<h3><?php echo $movie['name']?></h3>
<img src="images/<?php echo $movie['image']?>" alt="" width="300">
<p style='text-indent: 2em'><?php echo $movie['detail']?></p>
<?php } }?>
<?php include 'footer.php'?>