


Analysis of pipeline communication examples in PHP multi-thread programming
This article mainly introduces pipeline communication in PHP multi-thread programming, and analyzes the principles and related usage techniques of pipeline communication with examples. It has certain reference value, friends in need can refer to it
The example in this article describes the usage of pipeline communication in PHP multi-threaded programming. Share it with everyone for your reference. The specific analysis is as follows:
If one thread is individual heroism, then multiple threads are collectivism. You are no longer a lone ranger, but a conductor.
Pipeline communication:
1. A pipeline can be thought of as a queue. Different threads can write things to it and read things from it. Just write
Adding at the end of the queue, reading means deleting at the head of the queue.
2. Pipes generally have a size, and the default is generally 4K. That is, if the content exceeds 4K, you can only read it but cannot write to it.
3. By default, after writing to the pipe, it will be blocked until the program that reads it has finished reading the data. And the reading thread will also be blocked,
Until a process writes data to the pipe. Of course, you can change this default attribute and use the stream_set_block function to set it to non-blocking mode.
The following is a pipeline class that I packaged (there is a problem with the naming of this class, it is not unified, and there is no time to change it to a unified one. I usually write the test code first and package it last, so the naming may not be unified):
?
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class Pipe { public $fifoPath; private $w_pipe; private $r_pipe;
/** * Automatically create a pipeline * * @param string $name pipe name * @param int $mode Pipe permissions, by default any user group can read and write */ function __construct($name = 'pipe', $mode = 0666) { $fifoPath = "/tmp/$name." . posix_getpid(); if (!file_exists($fifoPath)) { if (!posix_mkfifo($fifoPath, $mode)) { error("create new pipe ($name) error."); return false; } } else { error( "pipe ($name) has exit."); return false; } $this->fifoPath = $fifoPath; } /////////////////////////////////////////////////// // 写管道函数开始 /////////////////////////////////////////////////// function open_write() { $this->w_pipe = fopen($this->fifoPath, 'w'); if ($this->w_pipe == NULL) { error("open pipe {$this->fifoPath} for write error."); return false; } return true; }
function write($data) { return fwrite($this->w_pipe, $data); }
function write_all($data) { $w_pipe = fopen($this->fifoPath, 'w'); fwrite($w_pipe, $data); fclose($w_pipe); }
function close_write() { return fclose($this->w_pipe); } ///////////////////////////////////////////////////////// /// 读管道相关函数开始 //////////////////////////////////////////////////////// function open_read() { $this->r_pipe = fopen($this->fifoPath, 'r'); if ($this->r_pipe == NULL) { error("open pipe {$this->fifoPath} for read error."); return false; } return true; } function read($byte = 1024) { return fread($this->r_pipe, $byte); } function read_all() { $r_pipe = fopen($this->fifoPath, 'r'); $data = ''; while (!feof($r_pipe)) { //echo "read one Kn"; $data .= fread($r_pipe, 1024); } fclose($r_pipe); return $data; } function close_read() { return fclose($this->r_pipe); } /** * Delete pipe * * @return boolean is success */ function rm_pipe() { return unlink($this->fifoPath); } } ?> /* 有了这个类,就可以实现简单的管道通信了。*/ |
希望本文所述对大家的php程序设计有所帮助。

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。

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。

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。


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