


W3school's PHP tutorial refining (2) PHP advanced_PHP tutorial
1 Date()
1.1 Date()函数
语法:date(format,timestamp)
format:必需。规定时间戳的格式。
timestamp:可选。规定时间戳。默认是当前的日期和时间。
1.2 时间戳(Timestamp)
自1970.1.1(00:00:00GMT)以来的秒数
1.3 格式化日期
date()函数的format参数规定了如何格式化日期/时间
d:月中的天(01-31)
m:当前的月,以数字计(01-12)
Y:当前的年(四位数)
";echo date("Y-m-d");?>1.4 添加时间戳
date()函数的timestamp参数规定了一个时间戳
1.5 mktime()函数
mktime()函数可为指定的日期返回Unix时间戳
语法:mktime(hour,minute,second,month,day,year,is_dst)
2 引用文件
2.1 include()函数
2.2 require()函数
和include()的错误处理方式不同:include()函数会生成一个警告(但是脚本会继续执行),而require()函数会生成一个致命错误(fatal error)(在错误发生后脚本会停止执行)
3 文件处理
3.1 打开文件 fopen()函数
第一个参数含有要打开的文件的名称
第二个参数规定了使用哪种模式来打开文件
模式
描述
r
只读。在文件的开头开始。
r+
读/写。在文件的开头开始。
w
只写。打开并清空文件的内容;如果文件不存在则创建新文件
w+
读/写。打开并清空文件的内容;如果文件不存在则创建新文件
a
追加。打开并向文件末端进行写操作,如果文件不存在则创建新文件
a+
读/追加。通过向文件末端写内容,来保持文件内容
x
只写。创建新文件。如果文件已存在则返回false
x+
读/写。创建新文件。如果文件已存在,则返回false和一个错误。如果fopen()无法打开指定文件,则返回0(false)
3.2 关闭文件 fclose()函数
3.3 检测End-of-file feof()函数
3.4 逐行读取文件 fgets()函数
在调用该函数之后,文件指针会移动到下一行
";}fclose($file);?>3.5 逐字符读取文件 fgetc()函数
在调用该函数之后,文件指针会移动到下一个字符
4 文件上传
4.1 创建表单
4.2 上传脚本 全局数组$_FILES
0){echo "Error: " . $_FILES["file"]["error"] . "
";}else{echo "Upload: " . $_FILES["file"]["name"] . "
";echo "Type: " . $_FILES["file"]["type"] . "
";echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb
";echo "Stored in: " . $_FILES["file"]["tmp_name"];}?>$_FILES数组的第一个参数是表单的input name,第二个下标可以是:
name:被上传文件的名称
type:被上传文件的类型
size:被上传文件的大小
tmp_name:存储在服务器的文件的临时副本的名称
error:由文件上传导致的错误代码
4.3 上传限制
限制上传.gif或者.jpeg文件,文件大小必须小于20kb:
0){echo "Error: " . $_FILES["file"]["error"] . "
";}else{echo "Upload: " . $_FILES["file"]["name"] . "
";echo "Type: " . $_FILES["file"]["type"] . "
";echo "Size: " . ($_FILES["file"]["size"] /1024) . " Kb
";echo "Stored in: " . $_FILES["file"]["tmp_name"];}else{echo "Invalid file";}}?>
4.4 保存被上传的文件
Copy the temporary copy of the uploaded file created in the temporary folder in the above example to another location to prevent it from disappearing at the end of the script
0){echo "Error: " . $_FILES["file"]["error"] . "
";}else{echo "Upload: " . $_FILES["file"]["name"] . "
";echo "Type: " . $_FILES["file"]["type" ] . "
";echo "Size: " . ($_FILES["file"]["size"] /1024) . " Kb
";echo "Temp file: " . $_FILES["file"]["tmp_name"] . "
";if(file_exists("upload/" . $_FILES["file"]["name"])){echo $_FILES[ "file"]["name"] . "already exists. ";}else{move_uploaded_file($_FILES["file"]["tmp_name"], "upload/" . $_FILES["file"]["name" ]);echo "Stored in: " . "upload/" . $_FILES["file"]["name"];}}}else{echo "Invalid file";}?>
5 Cookies
5.1 Create cookie setcookie() function
Syntax: setcookie(name, value, expire, path, domain);
5.2 Retrieve cookie value
Use the isset() function to confirm whether a cookie has been set:
";}else{echo "Welcome guest !
";}?>5.3 Delete cookies
6 Session variables
6.1 Start session
6.2 Storing session variables
6.3 Terminate session
7 mail() function is used to send emails from scripts.
Syntax: mail(to, subject, message, headers, parameters)
Parameter
Description
to
Required. Specify email recipients.
subject
Required. Specifies the subject of the email. Note: This parameter cannot contain any newline characters.
message
Required. Define the message to be sent. LF(
) to separate lines.
headers
Optional. Specify additional headers, such as From, Cc, and Bcc. CRLF(
) separates additional headers.
parameters
Optional. Specifies additional parameters for the mailer.
7.1 Example
?>

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