I often hear this question: "I have a contract sent from a website. How do I add an attachment to an email sent via a form?" The first thing I want to say is that there is no easy way to do this. You need a good understanding of PHP or other server-side scripting languages. Of course, you also need an account for a website that actually supports PHP. If you meet this prerequisite, you can use PHP to send emails with attachments after reading this chapter.
1. How attachments work
If you have ever searched for the "attachment" function in the PHP manual, the result may be nothing (at least as of this writing) time has not yet passed). Later you will spend a lot of time to understand this knowledge.
You might think that when you send an email with an attachment to someone, the attachment is placed in the recipient's mailbox along with the email (for example, if you send him/her A PNG image file, his/her mailbox will contain a txt file (email) and a .png file (attachment)). But that's not how it works. When you add an attachment, your email program converts the attachment into a plain text file and inserts the block of text after what you wrote (the actual email). This, when you send everything out, there is only a plain text file in the recipient's inbox - a file that contains both the attachment and the actual email content.
Below is an example of an email with an attachment (an HTML file). I have marked some important lines:
Return-Path:
Date: Mon, 22 May 2000 19:17:29 +0000
From: Someone
To: Person
Message-id:
Content-type: multipart/mixed; boundary="396d983d6b89a"
Subject: Here's the subject
-- 396d983d6b89a
Content-type: text/plain; charset=iso-8859-1
Content-transfer-encoding: 8bit
This is the body of the email.
- -396d983d6b89a
Content-type: text/html; name=attachment.html
Content-disposition: inline; filename=attachment.html
Content-transfer-encoding: 8bit

php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

查找方法:1、用strpos(),语法“strpos("字符串值","查找子串")+1”;2、用stripos(),语法“strpos("字符串值","查找子串")+1”。因为字符串是从0开始计数的,因此两个函数获取的位置需要进行加1处理。


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