


This article introduces in detail the implementation of asynchronous calling multi-threading methods in PHP. Next, we will send a recommendation email to 1,000 users. The user enters or imports the email account and submits it to the server for execution.
For example, there is a scenario where a recommendation email is sent to 1,000 users. The user enters or imports the email account and submits it to the server for sending.
The code is as follows | Copy code | ||||
|
At this time we need "asynchronous execution" technology to execute the code. The characteristic of asynchronous execution is silent execution in the background. The user does not need to wait for the execution result of the code. The benefits of using asynchronous execution:
1 . Get rid of the application's dependence on a single task
2. Improve the execution efficiency of the program
代码如下 | 复制代码 |
$domain="www.***.com"; echo ''发送完毕'; |
The code is as follows | Copy code | ||||
$domain= "www.***.com";$url="/system_mail.php";$par="email=".implode(',',$emailarr)."&.... ....";$header = "POST $url HTTP/1.0rn";$header .= "Content-Type: application/x-www-form-urlencodedrn";$header .= "Content-Length: " . strlen($par) . "rnrn";$fp = @fsockopen ($domain, 80, $errno, $errstr, 30);fputs ($fp, $header . $par);fclose($fp);echo ''Sent completed';?>system_mail.phpini_set("ignore_user_abort",true);ignore_user_abort(true);//The code here requires php.ini to enable relevant options to ensure that PHP execution does not time out. If you don’t understand, please refer to my other article "Will the php script continue to run after closing the browser?" //Get the email address and send a message. Here is the sending code ?> |
代码如下 | 复制代码 |
pclose(popen("/home/xinchen/backend.php &", 'r')); |
This method avoids the shortcomings of the first method and is also fast. But the problem is that this method cannot request another WebService through the HTTP protocol and can only execute local script files. And it can only be opened in one direction, and cannot pass a large number of parameters to the called script.
And if the number of visits is high, a large number of processes will be generated. If you use external resources, you have to consider the competition yourself.
3. Use the CURL
method and set CUROPT_TIMEOUT to 1 (the minimum is 1, depressing). That is, the client must wait at least 1 second.
The code is as follows
|
Copy code |
||||
$ch = curl_init();
| $curl_opt = array(CURLOPT_URL, 'http://www.example.com/backend.php',
The code is as follows | Copy code |
$fp = fsockopen("www.example.com", 80, $errno, $errstr, 30);if (!$fp) { echo "$errstr ($errno) n";} else { $out = "GET /backend.php / HTTP/1.1rn"; $out .= "Host: www.example.comrn"; $out .= "Connection: Closernrn"; fwrite($fp , $out); /*Ignore the execution resultwhile (!feof($fp)) {echo fgets($fp, 128); }*/ fclose($fp);} |

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。

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。

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。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

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。


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.

SublimeText3 Linux new version
SublimeText3 Linux latest version

SublimeText3 Chinese version
Chinese version, very easy to use

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Mac version
God-level code editing software (SublimeText3)
