Sometimes when executing PHP, a file has multiple operations. If you wait for the operation to be completed, it will easily time out. At this time, we can consider asynchronous processing. Multiple operations are divided into two PHP file operations. The first PHP file can process some simple ones first, and the second file processes time-consuming programs asynchronously. For example, if we need to record a log after the operation is successful, then we can return when the operation is successful, and then process the log asynchronously. Below, PHP programmer Lei Xuesong takes you through four commonly used asynchronous processing solutions in PHP.
1. Use front-end Ajax processing
$.get("doAsync.php", { name: 'raykaeso',job:'PHP Programmer'} );
2. Use popen to execute local files
pclose(popen('php /var/www/doAsync.php &', 'r'));
3. Use curl
to set the curl timeout CURLOPT_TIMEOUT to 1 (minimum is 1), so the client needs to wait for 1 second, and the curl request address must be an absolute path
$param = array( 'name'=>'raykaeso', 'job'=>'PHP Programmer' ); $ch = curl_init(); curl_setopt($ch, CURLOPT_URL,"http://www.example.com/doAsync.php"); curl_setopt($ch, CURLOPT_POST, 1); curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($param)); //将数组转换为URL请求字符串 curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_HEADER, false); curl_setopt($ch, CURLOPT_TIMEOUT, 1); curl_exec($ch); curl_close($ch);
4. When using fsockopen, you need to splice the header part yourself
function doRequest($url, $param=array(),$timeout =10){ $urlParmas = parse_url($url); $host = $urlParmas['host']; $path = $urlParmas['path']; $port = isset($urlParmas['port'])? $urlParmas['port'] :80; $errno = 0; $errstr = ''; $fp = fsockopen($host, $port, $errno, $errstr, $timeout); $query = isset($param)? http_build_query($param) : ''; $out = "POST ".$path." HTTP/1.1\r\n"; $out .= "host:".$host."\r\n"; $out .= "content-length:".strlen($query)."\r\n"; $out .= "content-type:application/x-www-form-urlencoded\r\n"; $out .= "connection:close\r\n\r\n"; $out .= $query; fputs($fp, $out); fclose($fp); } $url = 'http://www.example.com/doAsync.php'; $param = array( 'name'=>'raykaeso', 'job'=>'PHP Programmer' ); doRequest($url, $param);
Note:
1. If you use Apache as a web server, you must first enable PHP to support asynchronous You must configure enablesendfile on in the Apache configuration file httpd.conf.
2. It is recommended to add the following two configurations to the asynchronously executed PHP file:
ignore_user_abort(true); // 忽略客户端断开 set_time_limit(0); // 设置执行不超时

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。

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。

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。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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