PHP7.2 更新内容
https://github.com/php/php-src/blob/php-7.2.0RC3/UPGRADING
从官方给的文档中，我似乎没有看到关于整体性能方面的修改。

鸟哥点评 PHP7.2 相对于 PHP7.1 主要优化也是在 opcache 。

服务器配置

2核 Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz
内存 4G
系统 Centos 6.2
gcc 4.4.7

安装

# http://hk1.php.net/get/php-7.1.10.tar.gz/from/this/mirror
$ ./configure --prefix=/data/local/php71 --with-config-file-path=/data/local/php71/etc --enable-fpm --with-fpm-user=www --with-fpm-group=www --enable-mysqlnd --with-mysqli=mysqlnd --with-pdo-mysql=mysqlnd --with-iconv-dir --with-freetype-dir=/usr/local/freetype --with-jpeg-dir --with-png-dir --with-zlib --with-libxml-dir=/usr --enable-xml --disable-rpath --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --enable-mbregex --enable-mbstring --enable-intl --enable-pcntl --with-mcrypt --enable-ftp --with-gd --enable-gd-native-ttf --with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --with-gettext --disable-fileinfo --enable-opcache --with-xsl

# https://downloads.php.net/~remi/php-7.2.0RC3.tar.gz
$ ./configure --prefix=/data/local/php72 --with-config-file-path=/data/local/php72/etc --enable-fpm --with-fpm-user=www --with-fpm-group=www --enable-mysqlnd --with-mysqli=mysqlnd --with-pdo-mysql=mysqlnd --with-iconv-dir --with-freetype-dir=/usr/local/freetype --with-jpeg-dir --with-png-dir --with-zlib --with-libxml-dir=/usr --enable-xml --disable-rpath --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization --with-curl --enable-mbregex --enable-mbstring --enable-intl --enable-pcntl --enable-ftp --with-gd --with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip --enable-soap --with-gettext --disable-fileinfo --enable-opcache --with-xsl

$ /data/local/php71/bin/php -v
PHP 7.1.10 (cli) (built: Oct  8 2017 16:08:01) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.1.0, Copyright (c) 1998-2017 Zend Technologies

$ /data/local/php72/bin/php -v
PHP 7.2.0RC3 (cli) (built: Oct  8 2017 18:11:35) ( NTS )
Copyright (c) 1997-2017 The PHP Group
Zend Engine v3.2.0-dev, Copyright (c) 1998-2017 Zend Technologies

php.ini 配置

仅供测试，非生产环境使用，摘录自 http://www.laruence.com/2016/12/18/3137.html

engine = On
short_open_tag = Off
realpath_cache_size = 2M
max_execution_time = 86400
memory_limit = 1024M
error_reporting = 0
display_errors = 0
display_startup_errors = 0
log_errors = 0
default_charset = "UTF-8"
 
[opcache]
zend_extension=opcache.so
opcache.enable=1
opcache.enable_cli=1
opcache.optimization_level=-1
opcache.fast_shutdown=1
opcache.validate_timestamps=1
opcache.revalidate_freq=60
opcache.use_cwd=1
opcache.max_accelerated_files=100000
opcache.max_wasted_percentage=5
opcache.memory_consumption=128
opcache.consistency_checks=0
opcache.huge_code_pages=1

纯 CPU 基准测试

基于Zend/bench.php的脚本测试

未开启 opcache

$ for i in `seq 1 10`;do /data/local/php71/bin/php /data/soft/php-7.2.0RC3/Zend/bench.php|grep 'Total'|awk '{print $0}' ;done 
Total              1.381
Total              1.416
Total              1.374
Total              1.366
Total              1.430
Total              1.394
Total              1.394
Total              1.369
Total              1.377
Total              1.358
# 取平均值  1.3859
$ for i in `seq 1 10`;do /data/local/php72/bin/php /data/soft/php-7.2.0RC3/Zend/bench.php|grep 'Total'|awk '{print $0}' ;done                 
Total              1.448
Total              1.444
Total              1.445
Total              1.458
Total              1.440
Total              1.447
Total              1.486
Total              1.433
Total              1.449
Total              1.464
# 取平均值  1.4514

开启 opcache 之后

$ for i in `seq 1 10`;do /data/local/php71/bin/php /data/soft/php-7.2.0RC3/Zend/bench.php|grep 'Total'|awk '{print $0}' ;done
Total              0.794
Total              0.797
Total              0.798
Total              0.806
Total              0.808
Total              0.793
Total              0.814
Total              0.846
Total              0.859
Total              0.818
# 取平均值 0.8133
$ for i in `seq 1 10`;do /data/local/php72/bin/php /data/soft/php-7.2.0RC3/Zend/bench.php|grep 'Total'|awk '{print $0}' ;done
Total              0.779
Total              0.774
Total              0.765
Total              0.772
Total              0.764
Total              0.769
Total              0.779
Total              0.839
Total              0.784
Total              0.842
# 取平均值 0.7867

在本次测试中，未开启opcache的情况下，php7.2 性能反而有些下降，开启opcache之后，性能追赶上来，比php7.1略有提升。所以更应该开启opcache了。

基于Zend/micro_bench.php的脚本测试

未开启 opcache

$ for i in `seq 1 10`;do /data/local/php71/bin/php /data/soft/php-7.2.0RC3/Zend/micro_bench.php|grep 'Total'|awk '{print $0}' ;done
Total              5.588
Total              5.689
Total              5.652
Total              5.702
Total              5.668
Total              5.641
Total              5.622
Total              5.580
Total              5.635
Total              5.588
# 取平均值 5.6365
$ for i in `seq 1 10`;do /data/local/php72/bin/php /data/soft/php-7.2.0RC3/Zend/micro_bench.php|grep 'Total'|awk '{print $0}' ;done
Total              5.924
Total              5.597
Total              5.553
Total              5.579
Total              5.591
Total              5.523
Total              5.518
Total              5.503
Total              5.494
Total              5.558
# 取平均值 5.584

开启 opcache

$ for i in `seq 1 10`;do /data/local/php71/bin/php /data/soft/php-7.2.0RC3/Zend/micro_bench.php|grep 'Total'|awk '{print $0}' ;done
Total              4.369
Total              4.379
Total              4.352
Total              4.370
Total              4.375
Total              4.397
Total              4.311
Total              4.361
Total              4.313
Total              4.373
# 取平均值 4.36
$ for i in `seq 1 10`;do /data/local/php72/bin/php /data/soft/php-7.2.0RC3/Zend/micro_bench.php|grep 'Total'|awk '{print $0}' ;done
Total              3.711
Total              3.711
Total              3.712
Total              3.734
Total              3.700
Total              3.712
Total              3.705
Total              3.769
Total              3.785
Total              3.695
# 取平均值 3.7234

在本次测试中，未开启opcache的情况下，php7.2 性能比php7.1 略有提升，开启opcache之后，php7.2比php7.1有很大的提升。

图表呈现

软件应用测试

配置说明

2核 Intel(R) Xeon(R) CPU E5-2640 0 @ 2.50GHz
内存 4G
系统 Centos 6.2
nginx 1.10.1
mysql 5.5.28
wordpress 4.8.1

考虑到该服务器上已经在运行我的博客等其他服务，所以php-fpm子进程数只配置了15个，在相同配置文件的条件下对比。

# php-fpm 简单配置，仅供测试
[global]
pid = /data/local/php7{x}/var/run/php-fpm.pid
error_log = /data/log/php7{x}-fpm.log
log_level = notice

[www]
listen = /tmp/php7{x}-cgi.sock
listen.backlog = -1
listen.allowed_clients = 127.0.0.1
listen.owner = www
listen.group = www
listen.mode = 0666
user = www
group = www
pm = static
pm.max_children = 15

wordpress 压测

未开启 opcache

# php7.1
Concurrency Level:      10
Time taken for tests:   8.696 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      5215300 bytes
HTML transferred:       5189300 bytes
Requests per second:    11.50 [#/sec] (mean)
Time per request:       869.637 [ms] (mean)
Time per request:       86.964 [ms] (mean, across all concurrent requests)
Transfer rate:          585.65 [Kbytes/sec] received

# php7.2
Concurrency Level:      10
Time taken for tests:   8.528 seconds
Complete requests:      100
Failed requests:        0
Write errors:           0
Total transferred:      5215500 bytes
HTML transferred:       5189300 bytes
Requests per second:    11.73 [#/sec] (mean)
Time per request:       852.793 [ms] (mean)
Time per request:       85.279 [ms] (mean, across all concurrent requests)
Transfer rate:          597.24 [Kbytes/sec] received

可以看到在未开启opcache的情况下，性能非常糟糕，10个并发的情况下，每个请求的响应时间已经非常长了，没有必要继续增加并发数了。

开启 opcache 之后

在开启opcache 之后，相对之前未开启的情况性能简直天壤之别。相比之下php7.2在wordpress压测上，QPS 稳定在70+ 相对php7.1 增加不少。

测试结果和配置参数以及服务器配置有关，仅供对比php7.1与7.2的性能。

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