How to dynamically create a Web site with PHP_PHP tutorial
PHP has 4 functions for using external functions: include(), include_once(), require() and require_once().
In order to use them, the following lines of code will be included in the PHP script:
include_once(' arr.php');
require('/path/to/filename.html');
The difference between two types of external functions:
It is exactly the same to use, but it will be different when an error occurs : If the include() function does not work, a script will be printed to the web browser, but the script will continue to run. If require() fails, an error will be printed and the script will terminate.
There is also a *_once() version of these two functions, which guarantees that the file being considered will only be included once, regardless of how many times the script may try to include it.
eg:
require('arr1.php');
include('arrsort.php');
?>
Use PHP's binding ability to process HTML forms
require('arr1.php'); //Include the file to be executed first
if(isset($_POST['name'])) //Determine whether to enter, and then execute..
{
$name=$_POST['name'];
echo "$name";
}
?>
黏性表单
预先设置文本框中输入的内容:
让PHP预先设置该值:
;
函数
函数名和变量的命名规则相同,但是函数名不区分大小写。例如:function name() 和function Name()是两个完全相同的函数。
时期和时间函数
date('format',[timestamp]);
依据指定的格式返回某一日期和时间的文本字符串。timestamp是一个可选项,表示正在考虑的日期从Unix Epoch(Unix时间戳,1970年1月1日0点)起所经过的秒数。它允许你获得关于特定日期的信息,如星期几。如果未指定时间戳,PHP就会使用服务器上的当前时间。
字符 |
含义 |
示例 |
Y |
用4位数字表示年 |
2005 |
y |
用2位数字表示年 |
05 |
n |
用1位或2位数字表示月份 |
2 |
m |
用2位数字表示月份 |
02 |
F |
月份 |
February |
M |
用3个字母表示月份 |
Feb |
j |
用1位或2位表示一月中的某一天 |
8 |
d |
用2位数字表示一月中的某一天 |
08 |
l |
星期几 |
Monday |
D |
用三个字母表示星期几 |
Mon |
g |
小时,用1位或2位数字表示的12小时格式 |
6 |
G |
小时,用1位或2位数字表示的24位小时格式 |
18 |
h |
小时,用2位数字表示的12小时格式 |
06 |
H |
小时,用2位数字表示的24小时格式 |
18 |
i |
分 |
45 |
s |
秒 |
18 |
a |
am或pm |
am |
A |
AM或PM |
AM |
$stamp=mktime(hour,minute,second,month,day,year);
可以使用getdate()函数返回日期和时间的一组值:
$dates=getdate();
echo $dates['month'];
键 |
值 |
示例 |
year |
年 |
2005 |
mon |
月 |
12 |
month |
月份名称 |
December |
mday |
一月中的某一天 |
25 |
weekday |
星期几 |
Tuesday |
hours |
小时数 |
11 |
minutes |
分钟数 |
56 |
seconds |
秒数 |
47 |
function md($m=NULL,$d=NULL,$y=NULL)
{
$months=array(1=>'January','February','March','April','May','June','July','Augst','September','October','November','December');
echo '';
echo '';
echo '';
}
echo '
select a date:
';
echo '
Today is'.date('l').'. The current time is'.date('H:i a').'.
';?>
格式化日期函数:
DATE_FORMAT('2005-05-20',%M,%d,%Y);
技巧总结
PHP的日期函数反映了服务器上的事件(因为PHP运行在服务器上);如果想确定客户计算机上的日期和时间,则需要使用javascript;
checkdate()函数带3个参数——月份、天和年份——并检查它是否是一个有效的日期(现在或过去实际存在的日期)。
发送电子邮件
mail($to,$subject,$body);
$to值应该是一个电子邮件地址或一系列地址,中间用逗号隔开。
$subject值将创建电子邮件的主题行,
$body可用于在其中设置电子邮件的内容。
在创建电子邮件正文时,可以在双引号内使用换行符(n),使文本分布在多行上。
$mail()函数带有四个可选参数,用于额外的电子邮件头部。在此可以设置From(发件人)、Reply-To(回复)、Cc(抄送)、Bcc(密件抄送)以及类似的设置。
eg:
mail('fanchangfa@126.com','Question regardingScript 3.13',$body,'From:killman@hotmail.com');
要在电子邮件中使用多个不同类型的头部,可以用rn把他们隔开:
$headers="From:John@hotmail.comrn";
$headers.="Cc:jane@hotmail.com,joe@hotmail.comrn";
mail('fanchangfa@126.com','Question','$body,$headers');

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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