最近碰到一个奇怪的问题, PHP使用 curl_exec 访问 HTTPS 网页时, 返回502错误, 访问HTTP网页时没有问题, 用 echo phpinfo() ; 查看, 支持openssl, 支持curl, 网上找了好多资料, 都没解决。
[root@www ~]# php -VFailed loading /usr/local/zend/ZendOptimizer.so: /usr/local/zend/ZendOptimizer.so: undefined symbol: zend_throw_exception_internalPHP Warning: PHP Startup: memcache: Unable to initialize moduleModule compiled with module API=20060613PHP compiled with module API=20090626These options need to match in Unknown on line 0PHP Warning: PHP Startup: Unable to load dynamic library '/usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/openssl.so' - /usr/local/php/lib/php/extensions/no-debug-non-zts-20060613/openssl.so: undefined symbol: zend_parse_parameters_none in Unknown on line 0
用 #php -V 查看, 提示 openssl.so 加载失败, 看来 肯定与openssl库有关。 重新安装了openssl库, 问题依旧。 原因是openssl库用到了 zend, 看上面的提示, 显示zend库也报错。 要处理估计还得重新安装zend库。 麻烦, 算了, 不让直接用源码编译一次 php, 说干就干吧。
下载了 PHP 5.5.0.tar.gz
# ./configure --prefix=/usr --with-config-file-path=/etc --with-mysql=/usr/local/mysql/ --with-mysqli=/usr/local/mysql/bin/mysql_config \--with-iconv-dir --with-freetype-dir --with-jpeg-dir --with-png-dir --with-zlib --with-libxml-dir=/usr --enable-xml --disable-rpath \--enable-discard-path --enable-magic-quotes --enable-safe-mode --enable-bcmath --enable-shmop --enable-sysvsem --enable-inline-optimization \--with-curl --with-curlwrappers --enable-mbregex --enable-fastcgi --enable-fpm --enable-force-cgi-redirect --enable-mbstring --with-mcrypt \--enable-ftp --with-gd --enable-gd-native-ttf --with-openssl --with-mhash --enable-pcntl --enable-sockets --with-xmlrpc --enable-zip \--enable-soap --without-pear --with-gettext --with-mime-magic# make ZEND_EXTRA_LIBS='-liconv' # make test# make install需要指定的目录 一个是mysql的安装目录, 一个是 mysql_config 所在的目录。
安装过程中可能会碰到一些错误, 下面是我安装碰到的,环境不一样, 每台机器碰到的问题也会不一样。
1、 碰到错误 xpm.h not found
# yum install libXpm-devel //注意x为大写
# yum install libXext-devel //注意x为大写
2、碰到错误 gmp.h not found
#yum install gmp
#yum install gmp-devel
3、碰到错误 error: utf8_mime2text() has new signature, but U8T_CANONICAL is missing. This should not happen
#yum install libc-client-devel
4、碰到错误 error: Unable to detect ICU prefix or /usr/bin/icu-config failed
#yum install libicu*
#yum install icu*
5、碰到错误 error: ODBC header file '/usr/include/sqlext.h' not found
#yum install unixODBC-devel
6、碰到错误 error: Cannot find pspell
#yum install aspell-devel
7、碰到错误 error: Can not find recode.h anywhere under /usr /usr/local /usr /opt.
#yum install recode
#yum install recode-devel
8、碰到错误 error: Could not find net-snmp-config binary
#yum install net-snmp-devel
9、碰到错误 error: Cannot find libtidy
#yum install libtidy-devel
php 安装完毕了 , 测试 了一下 php 页面, 问题依旧, 最终仔细看了一下, phpinfo() 函数显示的版本是 5.2.17, 而我安装的是 5.5.0, 显然 nginx 服务器使用的还是
老的 php, 没有启用我最新编译安装的 php, 查找了一下, 老的 php 的目录是 /usr/local/bin/php, 而我新安装的php目录是 /usr/bin/php
为何不用最新的php呢, 显然与 环境变量PATH有关 , 执行命令 env , 看到
PATH=/usr/local/mysql/bin:/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin
我们可以修改 /etc/profile 文件 , 把文件最后一行 :
export PATH=/usr/local/mysql/bin:$PATH
修改为
export PATH=/usr/local/mysql/bin:/usr/bin:$PATH
然后
# cd /etc
# source profile 重新加载 profile 文件
最后再测试 php 文件, curl_exec 可以访问 https 文件, 并取到数据了。

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ToimprovePHPapplicationspeed,followthesesteps:1)EnableopcodecachingwithAPCutoreducescriptexecutiontime.2)ImplementdatabasequerycachingusingPDOtominimizedatabasehits.3)UseHTTP/2tomultiplexrequestsandreduceconnectionoverhead.4)Limitsessionusagebyclosin

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DatabasequeryoptimizationinPHPinvolvesseveralstrategiestoenhanceperformance.1)Selectonlynecessarycolumnstoreducedatatransfer.2)Useindexingtospeedupdataretrieval.3)Implementquerycachingtostoreresultsoffrequentqueries.4)Utilizepreparedstatementsforeffi

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PHP performance bottlenecks can be solved through the following steps: 1) Use Xdebug or Blackfire for performance analysis to find out the problem; 2) Optimize database queries and use caches, such as APCu; 3) Use efficient functions such as array_filter to optimize array operations; 4) Configure OPcache for bytecode cache; 5) Optimize the front-end, such as reducing HTTP requests and optimizing pictures; 6) Continuously monitor and optimize performance. Through these methods, the performance of PHP applications can be significantly improved.

DependencyInjection(DI)inPHPisadesignpatternthatmanagesandreducesclassdependencies,enhancingcodemodularity,testability,andmaintainability.Itallowspassingdependencieslikedatabaseconnectionstoclassesasparameters,facilitatingeasiertestingandscalability.

CachingimprovesPHPperformancebystoringresultsofcomputationsorqueriesforquickretrieval,reducingserverloadandenhancingresponsetimes.Effectivestrategiesinclude:1)Opcodecaching,whichstorescompiledPHPscriptsinmemorytoskipcompilation;2)DatacachingusingMemc


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