php：strrev() --字符串顺序倒过来输出的涵数_PHP教程（php中将字符串前后颠倒的函数）

25-04-17 2

对于php：strrev()--字符串顺序倒过来输出的涵数_PHP教程感兴趣的读者，本文将会是一篇不错的选择，我们将详细介绍php中将字符串前后颠倒的函数，并为您提供关于'strrev'未在此范围内声

对于php：strrev() --字符串顺序倒过来输出的涵数_PHP教程感兴趣的读者，本文将会是一篇不错的选择，我们将详细介绍php中将字符串前后颠倒的函数，并为您提供关于'strrev' 未在此范围内声明、12.21 php-fpm的pool 12.22 php-fpm慢执行日志 12.23 open_basedir 12.24 php-fpm进程管理、5、PHP-将浮点数转为整数 php 浮点数比较 php 浮点数精度 php 浮点数格式、Brew 安装 php，但“php -v”返回 MacOS 原生 php 的信息的有用信息。

本文目录一览：

php：strrev() --字符串顺序倒过来输出的涵数_PHP教程（php中将字符串前后颠倒的函数）
'strrev' 未在此范围内声明
12.21 php-fpm的pool 12.22 php-fpm慢执行日志 12.23 open_basedir 12.24 php-fpm进程管理
5、PHP-将浮点数转为整数 php 浮点数比较 php 浮点数精度 php 浮点数格式
Brew 安装 php，但“php -v”返回 MacOS 原生 php 的信息

php：strrev() --字符串顺序倒过来输出的涵数_PHP教程（php中将字符串前后颠倒的函数）

例：请把“abcde” 输出为 “edcba”. 必须使用涵数来编成.

[php]

echo strrev("abcde");

//输出 ''edcba''

http://www.bkjia.com/PHPjc/477790.htmlwww.bkjia.comtruehttp://www.bkjia.com/PHPjc/477790.htmlTechArticle例：请把abcde 输出为 edcba. 必须使用涵数来编成. [php] echo strrev(abcde); //输出 edcba...

'strrev' 未在此范围内声明

如何解决''strrev'' 未在此范围内声明？

编译后我得到“strrev 未在此代码中声明”，似乎我不能在 strcpy 中使用 strrev ？如果是这样，将 char 数组分配给 strrev(b) 的值会解决它吗？这是代码：

#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;

ifstream fin("palindrom.in");
ofstream fout("palindrom.out");

int main(){
    int i,n = 0,x,v[100],q=0;
    char a[256],b[256],rev[256],be[256];
    
    int ind=0;
    fin>>x;

    fin.get();
    for(i = 0; i < x; i++){
        fin.get(a,256);
        fin.get();

        for(int j = 0; j < strlen(a); j++){
            if(!strchr(" ",a[j])){
                b[n++] = a[j];
            }
        }
        b[n++] = 0;
        strcpy(be,b);
        strcpy(rev,strrev(b));

        if(strcmp(be,rev) == 0){
            v[ind++] = 1;
        }
        else{
            v[ind++] = 0;
        }

        memset(b,256);
        n = 0;
    }

    for(i = 0; i < x; i++){
        fout<<v[i]<<endl;
    }
}

Here''s where the error occurs

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

小编邮箱:dio#foxmail.com (将#修改为@）

12.21 php-fpm的pool 12.22 php-fpm慢执行日志 12.23 open_basedir 12.24 php-fpm进程管理

12.21 php-fpm的pool

为了避免因多站点使用同一个pool时因一个站点故障导致pool出问题，进而影响使用同一个pool的其他站点的正常运行，要对每个站点配置一个单独的pool。

为php-fpm增加pool

[root@cham002 cham.com]# cd /usr/local/php-fpm/etc/
[root@cham002 etc]# ls
pear.conf  php-fpm.conf  php-fpm.conf.default  php.ini
[root@cham002 etc]# cat php-fpm.conf
[global]
pid = /usr/local/php-fpm/var/run/php-fpm.pid
error_log = /usr/local/php-fpm/var/log/php-fpm.log
[www]
#listen = /tmp/php-fcgi.sock
listen = 127.0.0.1:9000
listen.mode = 666
user = php-fpm
group = php-fpm
pm = dynamic
pm.max_children = 50
pm.start_servers = 20
pm.min_spare_servers = 5
pm.max_spare_servers = 35
pm.max_requests = 500
rlimit_files = 1024
[root@cham002 etc]# vi !$
vi php-fpm.conf

[champin.com]
#listen = /tmp/champin.sock
listen = 127.0.0.1:9000
listen.mode = 666
user = php-fpm
group = php-fpm
pm = dynamic
pm.max_children = 50
pm.start_servers = 20
pm.min_spare_servers = 5
pm.max_spare_servers = 35
pm.max_requests = 500
rlimit_files = 1024

语法检测：

[root@cham002 etc]# /usr/local/php-fpm/sbin/php-fpm -t
[09-Jan-2018 00:36:35] ERROR: [pool champin.com] unable to set listen address as it''s already used in another pool ''www''
[09-Jan-2018 00:36:35] ERROR: failed to post process the configuration
[09-Jan-2018 00:36:35] ERROR: FPM initialization failed

原因是我以为名字不对，后来换了名字还是不行，仔细看配置文件发现原因

[root@cham002 etc]# /usr/local/php-fpm/sbin/php-fpm -t
[09-Jan-2018 00:45:20] NOTICE: configuration file /usr/local/php-fpm/etc/php-fpm.conf test is successful
[root@cham002 etc]# /etc/init.d/php-fpm reload
Reload service php-fpm  done

[root@cham002 etc]# ps aux |grep php-fpm
root      6251  0.5  0.4 227212  4980 ?        Ss   00:49   0:00 php-fpm: master process (/usr/local/php-fpm/etc/php-fpm.conf)
php-fpm   6252  0.0  0.4 227152  4712 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6253  0.0  0.4 227152  4712 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6254  0.0  0.4 227152  4712 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6255  0.0  0.4 227152  4712 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6256  0.0  0.4 227152  4716 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6257  0.0  0.4 227152  4716 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6258  0.0  0.4 227152  4716 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6259  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6260  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6261  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6262  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6263  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6264  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6265  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6266  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6267  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6268  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6269  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6270  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6271  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool www
php-fpm   6272  0.0  0.4 227152  4716 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6273  0.0  0.4 227152  4716 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6274  0.0  0.4 227152  4716 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6275  0.0  0.4 227152  4720 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6276  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6277  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6278  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6279  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6280  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6281  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6282  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6283  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6284  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6285  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6286  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6287  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6288  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6289  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6290  0.0  0.4 227152  4724 ?        S    00:49   0:00 php-fpm: pool champ
php-fpm   6291  0.0  0.4 227152  4728 ?        S    00:49   0:00 php-fpm: pool champ
root      6293  1.0  0.0 112680   976 pts/1    R+   00:49   0:00 grep --color=auto php-fpm

为站点配置pool

[root@cham002 etc]# cd /usr/local/nginx/conf/vhost/
[root@cham002 vhost]# ls
aaa.com.conf  load.conf  proxy.conf  ssl.conf  test.com.conf
[root@cham002 vhost]# vim aaa.com.conf 

server
{
    listen 80 default_server;
    server_name aaa.com;
    index index.html index.htm index.php;
    root /data/wwwroot/default;
 location ~ \.php$
    {
        include fastcgi_params;
        fastcgi_pass unix:/tmp/champ.sock;
       #fastcgi_pass 127.0.0.1:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME /data/wwwroot/default$fastcgi_script_name;
    }

}

说明： 把fastcgi_pass地址改为和php-fpm.conf中一样的地址就可以。

添加php-fpm.conf子配置文件

为了便于管理，可以将php-fpm中的每个pool单独进行管理。进行如下操作，添加php-fpm子配置文件：

[root@cham002 vhost]# cd /usr/local/php-fpm/etc/
[root@cham002 etc]# vim php-fpm.conf
[global]
pid = /usr/local/php-fpm/var/run/php-fpm.pid
error_log = /usr/local/php-fpm/var/log/php-fpm.log
include = etc/php-fpm.d/*.conf

说明： 在全局变量版块添加参数“include = etc/php-fpm.d/*.conf”。然后可以清除php-fpm配置文件中其他参数，再到php-fpm.d目录下进行单独设置。

[root@cham002 vhost]# cd /usr/local/php-fpm/etc/
[root@cham002 etc]# mkdir php-fpm.d
[root@cham002 etc]# cd php-fpm.d/
[root@cham002 php-fpm.d]# vim www.conf
[www]
listen = /tmp/php-fcgi.sock
#listen = 127.0.0.1:9000
listen.mode = 666
user = php-fpm
group = php-fpm
pm = dynamic
pm.max_children = 50
pm.start_servers = 20
pm.min_spare_servers = 5
pm.max_spare_servers = 35
pm.max_requests = 500
rlimit_files = 1024
[root@cham002 php-fpm.d]# ls
www.conf

[root@cham002 php-fpm.d]# vim champ.conf
[champ]
listen = /tmp/champ.sock
#listen = 127.0.0.1:9000
listen.mode = 666
user = php-fpm
group = php-fpm
pm = dynamic
pm.max_children = 50
pm.start_servers = 20
pm.min_spare_servers = 5
pm.max_spare_servers = 35
pm.max_requests = 500
rlimit_files = 1024
[root@cham002 php-fpm.d]# ls
champ.conf  www.conf


[root@cham002 php-fpm.d]# /usr/local/php-fpm/sbin/php-fpm -t
[09-Jan-2018 01:20:26] NOTICE: configuration file /usr/local/php-fpm/etc/php-fpm.conf test is successful

[root@cham002 php-fpm.d]# /etc/init.d/php-fpm restart
Gracefully shutting down php-fpm . done
Starting php-fpm  done


[root@cham002 php-fpm.d]# ps aux |grep php-fpm
root      6508  1.5  0.4 227240  4988 ?        Ss   01:26   0:00 php-fpm: master process (/usr/local/php-fpm/etc/php-fpm.conf)
php-fpm   6509  0.0  0.4 227180  4720 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6510  0.0  0.4 227180  4720 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6511  0.0  0.4 227180  4720 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6512  0.0  0.4 227180  4720 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6513  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6514  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6515  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6516  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6517  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6518  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6519  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6520  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6521  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6522  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6523  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6524  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6525  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6526  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6527  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6528  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool champ
php-fpm   6529  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6530  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6531  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6532  0.0  0.4 227180  4724 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6533  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6534  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6535  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6536  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6537  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6538  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6539  0.0  0.4 227180  4728 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6540  0.0  0.4 227180  4732 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6541  0.0  0.4 227180  4732 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6542  0.0  0.4 227180  4732 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6543  0.0  0.4 227180  4732 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6544  0.0  0.4 227180  4732 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6545  0.0  0.4 227180  4732 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6546  0.0  0.4 227180  4732 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6547  0.0  0.4 227180  4732 ?        S    01:26   0:00 php-fpm: pool www
php-fpm   6548  0.0  0.4 227180  4732 ?        S    01:26   0:00 php-fpm: pool www
root      6550  0.0  0.0 112680   976 pts/1    R+   01:26   0:00 grep --color=auto php-fpm

配置完成后使用ps查看php-fpm进程信息。

12.22 php-fpm的慢执行日志

开启慢执行日志：

[root@cham002 php-fpm.d]# vim www.conf 

[www]
listen = /tmp/php-fcgi.sock
#listen = 127.0.0.1:9000
listen.mode = 666
user = php-fpm
group = php-fpm
pm = dynamic
pm.max_children = 50
pm.start_servers = 20
pm.min_spare_servers = 5
pm.max_spare_servers = 35
pm.max_requests = 500
rlimit_files = 1024
request_slowlog_timeout = 1
#当请求超过1秒开始记录日志
slowlog = /usr/local/php-fpm/var/log/www-slow.log
#日志存放路径

试验

在使用www pool的站点添加文件：

[root@cham002 php-fpm.d]# /usr/local/php-fpm/sbin/php-fpm -t
[09-Jan-2018 01:31:57] NOTICE: configuration file /usr/local/php-fpm/etc/php-fpm.conf test is successful

[root@cham002 php-fpm.d]# /etc/init.d/php-fpm reload
Reload service php-fpm  done

[root@cham002 php-fpm.d]# ls /usr/local/php-fpm/var/log/www-slow.log
/usr/local/php-fpm/var/log/www-slow.log

[root@cham002 php-fpm.d]# vim /data/wwwroot/test.com/sleep.php

<?php
 echo "test slow log";
sleep(2);
echo "done";
?>

试一下

[root@cham002 php-fpm.d]# curl -x127.0.0.1:80 test.com/sleep.php
<html>
<head><title>502 Bad Gateway</title></head>
<body bgcolor="white">
<center><h1>502 Bad Gateway</h1></center>
<hr><center>nginx/1.12.1</center>
</body>
</html>
[root@cham002 php-fpm.d]# cat /usr/local/nginx/conf/vhost/test.com.conf 
server
{
    listen 80;
#报502的错误，查看配置文件，发现监听的地址被注重掉了
[root@cham002 php-fpm.d]# cat /usr/local/nginx/conf/vhost/test.com.conf 
server
{
    listen 80;
    server_name test.com test2.com test3.com;
    index index.html index.htm index.php;
    root /data/wwwroot/test.com;
    if ($host != ''test.com'' ) {
        rewrite  ^/(.*)$  http://test.com/$1  permanent;
    }
   # location ~ .*\.(gif|jpg|jpeg|png|bmp|swf)$
   # {
   #       expires      7d;
   #       access_log off;
   # }
location ~* ^.+\.(gif|jpg|png|swf|flv|rar|zip|doc|pdf|gz|bz2|jpeg|bmp|xls)$
{
    expires 7d;
    valid_referers none blocked server_names  *.test.com ;
    if ($invalid_referer) {
        return 403;
    }
    access_log off;
}


    location ~ .*\.(js|css)$
    {
          expires      12h;
          access_log off;
    }
    location /admin/
    {
       allow 127.0.0.1;
       allow 192.168.230.135;
       deny all;
    }

    location ~ .*(upload|image)/.*\.php$
    {
        deny all;
    }
    
    if ($http_user_agent ~ ''Spider/3.0|YoudaoBot|Tomato'')
    {
      return 403;
    }

    location ~ \.php$
    {
        include fastcgi_params;
        #fastcgi_pass unix:/tmp/php-fcgi.sock;
        fastcgi_pass 127.0.0.1:9000;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME /data/wwwroot/test.com$fastcgi_script_name;
    }



    access_log /tmp/test.com.log cham;
}

[root@cham002 php-fpm.d]# /usr/local/nginx/sbin/nginx -t
nginx: the configuration file /usr/local/nginx/conf/nginx.conf syntax is ok
nginx: configuration file /usr/local/nginx/conf/nginx.conf test is successful
[root@cham002 php-fpm.d]#  /usr/local/nginx/sbin/nginx -s reload


[root@cham002 php-fpm.d]# curl -x127.0.0.1:80 test.com/sleep.php
test slow logdone

Reload service php-fpm  done


[root@cham002 php-fpm.d]# cat /usr/local/php-fpm/var/log/www-slow.log 
##查看日志！！！！！
[09-Jan-2018 01:50:17]  [pool www] pid 6700
script_filename = /data/wwwroot/test.com/sleep.php
[0x00007f98c94b02f8] sleep() /data/wwwroot/test.com/sleep.php:3

日志中表明详细信息

说明：一般会写成2秒，多数php脚本都会超过1秒

12.23 php-fpm中指定open_basedir

当一台服务器跑多个站点时，使用open_basedir限定各个站点所能访问的服务器上的目录的范围。在php-fpm服务中，可以针对每个pool设定open _ basedir。

核心配置参数：

[root@cham002 php-fpm.d]# vim www.conf 

[www]
listen = /tmp/php-fcgi.sock
#listen = 127.0.0.1:9000
listen.mode = 666
user = php-fpm
group = php-fpm
pm = dynamic
pm.max_children = 50
pm.start_servers = 20
pm.min_spare_servers = 5
pm.max_spare_servers = 35
pm.max_requests = 500
rlimit_files = 1024
request_slowlog_timeout = 1
slowlog = /usr/local/php-fpm/var/log/www-slow.log
php_admin_value[open_basedir]=/data/wwwroot/test.com:/tmp/


[root@cham002 php-fpm.d]# /etc/init.d/php-fpm restart
Gracefully shutting down php-fpm . done
Starting php-fpm  done
[root@cham002 php-fpm.d]# curl -x127.0.0.1:80 test.com/3.php -I
HTTP/1.1 200 OK
Server: nginx/1.12.1
Date: Mon, 08 Jan 2018 18:05:28 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
X-Powered-By: PHP/5.6.30

[root@cham002 php-fpm.d]# vi /usr/local/php-fpm/etc/php.ini

[root@cham002 php-fpm.d]# grep error_log /usr/local/php-fpm/etc/php.ini
; server-specific log, STDERR, or a location specified by the error_log
; Set maximum length of log_errors. In error_log information about the source is
;error_log = php_errors.log
;error_log = syslog
error_log = /usr/local/php-fpm/var/log/php_errors.log
; OPcache error_log file name. Empty string assumes "stderr".
;opcache.error_log=
[root@cham002 php-fpm.d]# ls /usr/local/php-fpm/var/log/
php-fpm.log   www-slow.log  
[root@cham002 php-fpm.d]# vim www.conf 故意写错地址
[root@cham002 php-fpm.d]# touch /usr/local/php-fpm/var/log/php_errors.log
[root@cham002 php-fpm.d]# chmod 777 /usr/local/php-fpm/var/log/php_errors.log
[root@cham002 php-fpm.d]# /etc/init.d/php-fpm restart
Gracefully shutting down php-fpm . done
Starting php-fpm  done

[root@cham002 php-fpm.d]# curl -x127.0.0.1:80 test.com/3.php
No input file specified.
[root@cham002 php-fpm.d]# curl -x127.0.0.1:80 test.com/3.php -I
HTTP/1.1 404 Not Found
Server: nginx/1.12.1
Date: Mon, 08 Jan 2018 18:17:50 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
X-Powered-By: PHP/5.6.30

[root@cham002 php-fpm.d]# cat /usr/local/php-fpm/var/log/php_errors.log
[08-Jan-2018 18:17:44 UTC] PHP Warning:  Unknown: open_basedir restriction in effect. File(/data/wwwroot/test.com/3.php) is not within the allowed path(s): (/data/wwwroot/etest.com:/tmp/) in Unknown on line 0
[08-Jan-2018 18:17:44 UTC] PHP Warning:  Unknown: failed to open stream: Operation not permitted in Unknown on line 0
[08-Jan-2018 18:17:50 UTC] PHP Warning:  Unknown: open_basedir restriction in effect. File(/data/wwwroot/test.com/3.php) is not within the allowed path(s): (/data/wwwroot/etest.com:/tmp/) in Unknown on line 0
[08-Jan-2018 18:17:50 UTC] PHP Warning:  Unknown: failed to open stream: Operation not permitted in Unknown on line 0

改正之后再来测试
[root@cham002 php-fpm.d]# vim www.conf 

[root@cham002 php-fpm.d]# curl -x127.0.0.1:80 test.com/3.php -I
HTTP/1.1 200 OK
Server: nginx/1.12.1
Date: Mon, 08 Jan 2018 18:21:54 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
X-Powered-By: PHP/5.6.30

12.24 php-fpm进程管理

php-fpm中pool配置参数解析：

[root@cham002 php-fpm.d]# cat www.conf 
[www]
listen = /tmp/php-fcgi.sock
#listen = 127.0.0.1:9000
listen.mode = 666
user = php-fpm
group = php-fpm
pm = dynamic
;定义进程启动方式（dynamic表示动态，static表示静态）
;只有此处设置为dynamic，下面的配置才生效
pm.max_children = 50
;最多可启动的子进程数量
pm.start_servers = 20
;设定初始启动的进程数量
pm.min_spare_servers = 5
;表示php-fpm空闲时最少要有几个子进程
pm.max_spare_servers = 35
;表示php-fpm空闲时最多要有几个子进程
pm.max_requests = 500
;表示一个子进程最多可接受多少个请求
rlimit_files = 1024
;表示每个子进程打开的多少个文件句柄
request_slowlog_timeout = 1
;当请求超过1秒开始记录日志
slowlog = /usr/local/php-fpm/var/log/www-slow.log
;日志存放地址
php_admin_value[open_basedir]=/data/wwwroot/test.com:/tmp/

5、PHP-将浮点数转为整数 php 浮点数比较 php 浮点数精度 php 浮点数格式

1、使用强制类型转换

首先PHP支持如下所示的数据类型：

<span>1. </span>Integer    (整数)
<span>2. </span>Float      (浮点数)
<span>3. </span>String     (字符串)
<span>4. </span>Boolean    (布尔值)
<span>5. </span>Array      (数组)
<span>6. </span>Object     (对象)

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此外还有两个特殊的类型：NULL(空)、resource（资源）。

注：
1. 没有被赋值、已经被重置或者被赋值为特殊值NULL的变量就是NULL类型的变量。
2. 特定的内置函数（例如数据库函数）将返回resource类型的变量。

接着可以使用类似C语言的强制类型转换，例如

<span><?php </span><span>$a</span>=<span>6.66666</span>;
<span>$b</span>=(integer)<span>$a</span>;
<span>echo</span><span>$b</span>;</span>

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将输出一个6，直接舍去了小数部分

立即学习“PHP免费学习笔记（深入）”；

2、使用float floor ( float value) 函数

舍去法取整，返回不大于 value 的下一个整数，将 value 的小数部分舍去取整。floor() 返回的类型仍然是 float，因为float 值的范围通常比 integer 要大。

echo <span>floor</span>(<span>4.3</span>);   <span>// 输出4 </span>
echo <span>floor</span>(<span>9.999</span>); <span>// 输出9</span>

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3、使用float ceil ( float value) 函数

进一法取整，返回不小于 value 的下一个整数，value 如果有小数部分则进一位。ceil() 返回的类型仍然是 float，因为float 值的范围通常比 integer 要大。

echo <span>ceil</span>(<span>4.3</span>);    <span>// 输出5 </span>
echo <span>ceil</span>(<span>9.999</span>);  <span>// 输出10</span>

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4、使用float round ( float val [, int precision])函数

对浮点数进行四舍五入，返回将 val 根据指定精度 precision（十进制小数点后数字的数目）进行四舍五入的结果。precision 也可以是负数或零（默认值）。

echo <span>round</span>(<span>3.4</span>);         <span>// 输出3 </span>
echo <span>round</span>(<span>3.5</span>);         <span>// 输出4 </span>
echo <span>round</span>(<span>3.6</span>);         <span>// 输出4 </span>
echo <span>round</span>(<span>3.6</span>, <span>0</span>);      <span>// 输出4 </span>
echo <span>round</span>(<span>1.95583</span>, <span>2</span>);  <span>// 输出1.96 </span>
echo <span>round</span>(<span>1241757</span>, -<span>3</span>); <span>// 输出1242000 </span>
echo <span>round</span>(<span>5.045</span>, <span>2</span>);    <span>// 输出5.04 </span>
echo <span>round</span>(<span>5.055</span>, <span>2</span>);    <span>// 输出5.06</span>

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'').addClass(''pre-numbering'').hide(); $(this).addClass(''has-numbering'').parent().append($numbering); for (i = 1; i '').text(i)); }; $numbering.fadeIn(1700); }); });

以上就介绍了5、PHP-将浮点数转为整数，包括了php,浮点数方面的内容，希望对PHP教程有兴趣的朋友有所帮助。

Brew 安装 php，但“php -v”返回 MacOS 原生 php 的信息

删除系统二进制文件通常不是一个好主意。相反，您可以在 ~/.zshrc 文件中添加别名。在文件末尾添加：

alias php="/usr/local/bin/php"

解决方案是将其放入 ~/.bash-profile

export PATH=/usr/local/bin:$PATH

重启电脑，它准备好了，现在当我php -v

PHP 8.0.3 (cli) (built: Mar  4 2021 20:45:17) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.3,Copyright (c) Zend Technologies
    with Zend OPcache v8.0.3,Copyright (c),by Zend Technologies

我们今天的关于php：strrev() --字符串顺序倒过来输出的涵数_PHP教程和php中将字符串前后颠倒的函数的分享已经告一段落，感谢您的关注，如果您想了解更多关于'strrev' 未在此范围内声明、12.21 php-fpm的pool 12.22 php-fpm慢执行日志 12.23 open_basedir 12.24 php-fpm进程管理、5、PHP-将浮点数转为整数 php 浮点数比较 php 浮点数精度 php 浮点数格式、Brew 安装 php，但“php -v”返回 MacOS 原生 php 的信息的相关信息，请在本站查询。

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