64位系统下编译PHP找不到库文件问题
最近在64位系统上编译5.4.5版的PHP时,遇到报以下错:
checking for DSA_get_default_method in -lssl... yes checking for X509_free in -lcrypto... yes checking for pkg-config... /usr/bin/pkg-config configure: error: Cannot find OpenSSL's libraries
指定的编译参数:
./configure \ --prefix=/usr/local/services/php-5.4.5 \ --with-config-file-path=/usr/local/services/php-5.4.5/etc \ --enable-fpm \ --enable-mbstring \ --enable-soap \ --enable-sockets \ --enable-zip \ --with-curl=/usr \ --with-mysql=mysqlnd \ --with-mysqli=mysqlnd \ --with-pdo-mysql=mysqlnd \ --with-gd \ --with-jpeg-dir=/usr \ --with-png-dir=/usr \ --with-zlib-dir=/usr \ --with-freetype-dir=/usr \ --with-openssl=/usr
找不到openssl的库文件,但我明明有安装openssl-devel的,很奇怪,网上搜了一下,发现有很多朋友,遇到了同样的问题,有些人说--with-openssl不指定路径可解决,尝试了一下,的确编译通过了,但想不通,Why?后来,又搜了一些文章来看,终于找出问题的根源:安装的系统是64位的,而64位的用户库文件默认是在/usr/lib64,而我编译的时候,没有指定--with-libdir=lib64,而编译脚本默认是lib,这当然是找不到的。
将编译参数更改为:
./configure \ --prefix=/usr/local/services/php-5.4.5 \ --with-config-file-path=/usr/local/services/php-5.4.5/etc \ --enable-fpm \ --enable-mbstring \ --enable-soap \ --enable-sockets \ --enable-zip \ --with-curl=/usr \ --with-mysql=mysqlnd \ --with-mysqli=mysqlnd \ --with-pdo-mysql=mysqlnd \ --with-gd \ --with-jpeg-dir=/usr \ --with-png-dir=/usr \ --with-zlib-dir=/usr \ --with-freetype-dir=/usr \ --with-openssl=/usr \ --with-libdir=lib64
问题解决。

PHP remains a powerful and widely used tool in modern programming, especially in the field of web development. 1) PHP is easy to use and seamlessly integrated with databases, and is the first choice for many developers. 2) It supports dynamic content generation and object-oriented programming, suitable for quickly creating and maintaining websites. 3) PHP's performance can be improved by caching and optimizing database queries, and its extensive community and rich ecosystem make it still important in today's technology stack.

In PHP, weak references are implemented through the WeakReference class and will not prevent the garbage collector from reclaiming objects. Weak references are suitable for scenarios such as caching systems and event listeners. It should be noted that it cannot guarantee the survival of objects and that garbage collection may be delayed.

The \_\_invoke method allows objects to be called like functions. 1. Define the \_\_invoke method so that the object can be called. 2. When using the $obj(...) syntax, PHP will execute the \_\_invoke method. 3. Suitable for scenarios such as logging and calculator, improving code flexibility and readability.

Fibers was introduced in PHP8.1, improving concurrent processing capabilities. 1) Fibers is a lightweight concurrency model similar to coroutines. 2) They allow developers to manually control the execution flow of tasks and are suitable for handling I/O-intensive tasks. 3) Using Fibers can write more efficient and responsive code.

The PHP community provides rich resources and support to help developers grow. 1) Resources include official documentation, tutorials, blogs and open source projects such as Laravel and Symfony. 2) Support can be obtained through StackOverflow, Reddit and Slack channels. 3) Development trends can be learned by following RFC. 4) Integration into the community can be achieved through active participation, contribution to code and learning sharing.

PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.

PHP is not dying, but constantly adapting and evolving. 1) PHP has undergone multiple version iterations since 1994 to adapt to new technology trends. 2) It is currently widely used in e-commerce, content management systems and other fields. 3) PHP8 introduces JIT compiler and other functions to improve performance and modernization. 4) Use OPcache and follow PSR-12 standards to optimize performance and code quality.

The future of PHP will be achieved by adapting to new technology trends and introducing innovative features: 1) Adapting to cloud computing, containerization and microservice architectures, supporting Docker and Kubernetes; 2) introducing JIT compilers and enumeration types to improve performance and data processing efficiency; 3) Continuously optimize performance and promote best practices.


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