Tag Archive for 'shell'

PHP加Shell实现多进程

看到这个标题,大家可能要说我没常识,php根本不支持多线程啊,没错,php本身是不支持多线程,但是别忘了php的好搭档,apache和linux可是支持的,呵呵,lamp才是最佳组合,还在使用win服务器的现在知道为什么要用linux吧?好久没在phpchina说教了,今天水一帖,写个简单的代码演示下如何借助shell脚本实现多线程。

先写个简单的php代码,这里为了让脚本执行时间更长,方便看效果,sleep一下,呵呵!先看下test.php的代码:

<?php
for ($i=0;$i<10;$i++) {
echo $i;
sleep(10);
}

在看下shell脚本的代码,非常简单

#!/bin/bash
for i in 1 2 3 4 5 6 7 8 9 10
do
/usr/bin/php -q /var/www/html/test.php &
done

注意到在请求php代码的那行有一个&符号吗,这个是关键,不加的话是不能进行多线程的,&表示讲服务推送到后台执行,因此,在shell的每次的循环中不必等php的代码全部执行完在请求下一个文件,而是同时进行的,这样就实现了多线程,下面运行下shell看下效果,这里你将看到10个test.php进程再跑,再利用linux的定时器,定时请求这个shell,在处理一些需要多线程的任务,例如,批量下载时,非常好用!

Bash Shell Keyboard shortcuts

The following shortcuts work when using default (Emacs) key bindings. Vi-bindings can be enabled by running set -o vi.

Tab ⇆ : Autocompletes from the cursor position.
Ctrl+a : moves the cursor at the beginning of the line (equivalent to the key Home).
Ctrl+e : (end) moves the cursor at the line end (equivalent to the key End).
Ctrl+p : (previous) recalls the previous command (equivalent to the key ).
Ctrl+n : (next) recalls the next command (equivalent to the key ).
Ctrl+r : (research) recalls the last command including the specified character(s). A second Ctrl+r recalls the next anterior command which corresponds to the research
Ctrl+s : Go back to the next more recent command of the research (beware to not execute it from a terminal because this command also launches its XOFF). If you changed that XOFF setting, use Ctrl+q to return.
Ctrl+o : executes the found command from research.
Ctrl+l : clears the screen content (equivalent to the command clear).
Ctrl+u : clears the line content before the cursor and copy it in the clipboard.
Ctrl+k : clears the line content after the cursor and copy it in the clipboard.
Ctrl+w : clears the word before the cursor and copy it in the clipboard.
Ctrl+y : (yank) adds the clipboard content from the cursor position.
Ctrl+d : sends an EOF marker, which (unless disabled by an option) closes the current shell (equivalent to the command exit).
Ctrl+c : sends the signal SIGINT to the current task, which aborts and closes it.
Ctrl+z : sends the signal SIGTSTP to the current task, which suspends it. To return to it later one can enter fg ‘process name’ (foreground).
Ctrl+x Ctrl+x : (because x has a crossing shape) alternates the cursor with its old position.
Ctrl+x Ctrl+e : (editor because it takes the $EDITOR shell variable) edits the current line in vi.
Alt+f : (forward) moves forward the cursor of one word.
Alt+b : (backward) moves backward the cursor of one word.
Alt+Del : cuts the word before the cursor.
Alt+d : cuts the word after the cursor.
Alt+u : capitalizes every character from the cursor’s position to the end of the current word.
Alt+l : lowers the case of every character from the cursor’s position to the end of the current word.
Alt+c : capitalizes the character under the cursor and moves to the end of the word.
Alt+r : cancels the changes and put back the line as it was in the history.