php阶段20180822作业

今天是第9次学习，代码：

实例

<?php
header('content-type:text/html;charset=utf-8');
echo '<h3>变量的类型与检测作业20180822</h3>';
$age=30;
$salary=3560.99;
$name='peter zhu';
$isMarried=true;
echo $name,'的<span style="color:red">年龄</span>是：',$age,',工资是：',$salary,',是否已婚：',$isMarried.'<hr>';
$books=['php','mysql','html','css','javascript'];
echo'<pre>';
print_r($books);
$student=new stdClass();
$student->name='王伍';
$student->course='php';
$student->grade=80;
var_dump($student);
var_dump($student->name);
echo $student->name,'<br>','<hr>';
echo'<h3 style="color:blue">',print_r($student->name,true),'</h3>','<hr>';
$file=fopen('test.txt','r') or die('打开失败');
echo fread($file,filesize('test.txt'));
//fclose($file);
$price=null;
echo '$price is' . $price;
echo'<br>';
echo is_null($price)?'是NULL':'不是NULL','<br>';
echo gettype($file),'<hr>';
$price=125.99;
settype($price,'integer');
echo $price,'<hr>';
echo gettype($price);

代码2：

实例

<?php
header('content-type:text/html;charset=utf-8');
echo '<h3>分支结构20180822</h3>';
$grade=85;
if($grade<60){
    echo'<p style="color:red">很不幸，您得补考</p>';

}else if ($grade>=60&&$grade<80){
    echo'<p style="color:green">考得还不错</p>';

}else if ($grade>=80&&$grade<=100){
    echo '<p style="color:green">真是个天才</p>';
}