php守护进程之终极守护.........
近来需要在linux上运行一个分发数据的php守护进程 如下所示
- PHP code
<!-- Code highlighting produced by Actipro CodeHighlighter (freeware) http://www.CodeHighlighter.com/ --> /* receive.php 接收由UDP协议发送的数据 插入到trap表中 */ receive.php /* trap_handle.php(用做守护进程) 从trap表中查询数据 进行以下操作: 1.把查询出来的数据循环插入到四个表中 2.每条数据生成一个配置文件 (return array()类型) 3.每条数据对应插入一条log日志到log.txt和log表中 4.删除trap表中的该条数据 */ trap_handle.php <?php while(true){ //上述操作 }else{ sleep(1); //暂停1秒钟后,再次循环 } } ?> nohup /usr/local/bin/php /opt/trap_handle.php 2>&1 > /dev/null &
如果把trap_handle作为守护进程来长时间运行 这样行不行 有什么利弊 请大家各抒己见 也请做过类似东西的兄弟说说经验吧
------解决方案--------------------
个人意见:无此必要
如确因业务需要,就改用 c 写 rst 程序

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。

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。

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。


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