PHP Composer 安装
系统需求:
Composer 需要PHP5.3.2+ 以上的环境来运行。有几个敏感的PHP设置和编译标志也是必需的,但安装程序会发出警告当存在任何不兼容的情况。
比如PHP的扩展的要求是,安装或重新编译php without –disable-phar
为了从源地址安装软件包,而不是简单的压缩文件包,您将需要安装软件包的版本控制工具,比如git、svn或hg等。
Composer 是兼容多平台的,其运行适用于Windows,Linux和OSX。
安装失败的错误消息:
curl -sS https://getcomposer.org/installer | PHP #!/usr/bin/env php some settings on your machine make Composer unable to work properly. Make sure that you fix the issues listed below and run this script again: The phar extension is missing. Install it or recompile php without –disable-phar Your PHP (5.2.9) is too old, you must upgrade to PHP 5.3.2 or higher.
我的本地默认开发环境是PHP 5.2.9,当我尝试在PHP 5.2.9上安装时,提示版本过低,需要升级到PHP 5.3.2 或者更高的版本。
于是我下载XAMPP 1.7.7 usb lite 版本。
E:\USB\Dropbox\phpstorm\php53>E:\USB\xampp_177\php\php.exe -v PHP 5.3.8 (cli) (built: Aug 23 2011 11:50:20) Copyright (c) 1997-2011 The PHP Group Zend Engine v2.3.0, Copyright (c) 1998-2011 Zend Technologies
XAMPP 1.7.7 下的PHP环境是5.3.8。确认我的PHP环境大于等于PHP5.3.2后。
PHP 5.3 安装 Composer
E:\USB\Dropbox\phpstorm\php53>curl -sS https://getcomposer.org/installer | E:\USB\xampp_177\php\php.exe #!/usr/bin/env php Some settings on your machine may cause stability issues with Composer. If you encounter issues, try to change the following: The openssl extension is missing, which will reduce the security and stability o f Composer. If possible you should enable it or recompile php with –with-openssl Downloading… Composer successfully installed to: E:\USB\Dropbox\phpstorm\php53\composer.phar Use it: php composer.phar
注意:
我关闭了XAMPP 1.7.7 Apache的SSL模块,所以Composer提示我警告,为了安全因素建议我开启SSL模块。不开启也不影响使用。
安装时的参数 | PHP,一定要更改为真实的PHP环境路径,比如 | E:\USB\xampp_177\php\php.exe
使用Composer为PHP路径 + 命令,在我们安装的环境中,使用方法为:E:\USB\xampp_177\php/php.exe composer.phar 命令。
我安装的环境是在Windows下,如果在Linux下,而PHP 5.3 环境也不在默认PHP命令下时,应该采用 | /usr/php/53/usr/bin/php,例如:
curl -sS https://getcomposer.org/installer | /usr/php/53/usr/bin/php
安装完成后,检查安装版本。
E:\USB\Dropbox\phpstorm\php53>E:\USB\xampp_177\php/php.exe composer.phar -V Composer version 0209bd31a0ac3aeb2a68fc81e2d03c71072bef33
检查PHP Composer命令:
E:\USB\Dropbox\phpstorm\php53>E:\USB\xampp_177\php/php.exe composer.phar ______ / ____/___ ____ ___ ____ ____ ________ _____ / / / __ \/ __ `__ \/ __ \/ __ \/ ___/ _ \/ ___/ / /___/ /_/ / / / / / / /_/ / /_/ (__ ) __/ / \____/\____/_/ /_/ /_/ .___/\____/____/\___/_/ /_/ Composer version 0209bd31a0ac3aeb2a68fc81e2d03c71072bef33 Usage: [options] command [arguments] Options: –help -h Display this help message. –quiet -q Do not output any message. –verbose -v Increase verbosity of messages. –version -V Display this application version. –ansi Force ANSI output. –no-ansi Disable ANSI output. –no-interaction -n Do not ask any interactive question. –profile Display timing and memory usage information –working-dir -d If specified, use the given directory as working directory . Available commands: about Short information about Composer archive Create an archive of this composer package config Set config options create-project Create new project from a package into given directory. depends Shows which packages depend on the given package diagnose Diagnoses the system to identify common errors. dump-autoload Dumps the autoloader dumpautoload Dumps the autoloader help Displays help for a command init Creates a basic composer.json file in current directory. install Installs the project dependencies from the composer.lock file if present, or falls back on the composer.json. list Lists commands require Adds required packages to your composer.json and installs the m run-script Run the scripts defined in composer.json. search Search for packages self-update Updates composer.phar to the latest version. selfupdate Updates composer.phar to the latest version. show Show information about packages status Show a list of locally modified packages update Updates your dependencies to the latest version according to composer.json, and updates the composer.lock file. validate Validates a composer.json
这样我们在PHP5.3环境下的Composer已经安装完成。
类似的方法我们也可以安装PHP 5.4的环境上。
PHP 5.4 安装 Composer
下载XAMPP 1.8.1 usb lite 版本,将得到PHP5.4.7环境。
E:\USB\Dropbox\phpstorm\php53>E:\USB\xampp_181\php\php.exe -v PHP 5.4.7 (cli) (built: Sep 12 2012 23:48:31) Copyright (c) 1997-2012 The PHP Group Zend Engine v2.4.0, Copyright (c) 1998-2012 Zend Technologies
确定版本高于PHP 5.3.2 后,开始安装:
E:\USB\Dropbox\phpstorm\php54>curl -sS https://getcomposer.org/installer | E:\USB\xampp_181\php\php.exe #!/usr/bin/env php Some settings on your machine may cause stability issues with Composer. If you encounter issues, try to change the following: The openssl extension is missing, which will reduce the security and stability o f Composer. If possible you should enable it or recompile php with –with-openssl Downloading… Composer successfully installed to: E:\USB\Dropbox\phpstorm\php54\composer.phar Use it: php composer.phar
安装完成后,检查安装版本。
E:\USB\Dropbox\phpstorm\php54>E:\USB\xampp_181\php/php.exe composer.phar -V Composer version 0209bd31a0ac3aeb2a68fc81e2d03c71072bef33
这样,PHP 5.4 环境下的Composer也安装成功了。
PHP Composer 使用
这里我只简单演示使用PHP Composer安装Symfony框架。
首先大概讲解一下命令的标准格式:
php composer.phar create-project symfony/framework-standard-edition path/ 2.2.1
第一个参数PHP为本地PHP开发环境,指向PHP运行命令。
第二个参数,为composer.phar方式下载。
第三个参数,为动作命令,例如create-project,目的是为了创建一个新的项目从一个软件包到指定目录。
第四个参数,为本地安装的目录。
第五个参数,为安装软件包的版本。
根据上述我们在PHP5.4环境下安装的Composer,我们的安装命令为:
E:\USB\Dropbox\phpstorm\php54>E:\USB\xampp_181\php/php.exe composer.phar create-project symfony/framework-standard-edition E:\USB\xampp_181\htdocs\Symfony 2.2.1
安装结果:
Installing symfony/framework-standard-edition (v2.2.1) – Installing symfony/framework-standard-edition (v2.2.1) Downloading: 100% Created project in E:\USB\xampp_181\htdocs\Symfony Loading composer repositories with package information Installing dependencies from lock file – Installing doctrine/lexer (v1.0) Downloading: 100% – Installing doctrine/annotations (v1.1) Downloading: 100% – Installing doctrine/cache (v1.0) Downloading: 100% – Installing doctrine/collections (v1.1) Downloading: 100% – Installing twig/twig (v1.12.2) Downloading: 100% – Installing psr/log (1.0.0) Downloading: 100% – Installing doctrine/inflector (v1.0) Downloading: 100% – Installing doctrine/common (2.4.0-RC1) Downloading: 100% – Installing symfony/symfony (v2.2.1) Downloading: 100% – Installing jdorn/sql-formatter (v1.2.0) Downloading: 100% – Installing doctrine/dbal (2.3.3) Downloading: 100% – Installing doctrine/doctrine-bundle (v1.2.0-beta1) Downloading: 100% – Installing doctrine/orm (2.3.3) Downloading: 100% – Installing jms/cg (1.0.0) Downloading: 100% – Installing phpoption/phpoption (1.2.0) Downloading: 100% – Installing jms/parser-lib (1.0.0) Downloading: 100% – Installing jms/metadata (1.3.0) Downloading: 100% – Installing jms/aop-bundle (1.0.0) Downloading: 100% – Installing jms/di-extra-bundle (1.3.0) Downloading: 100% – Installing jms/security-extra-bundle (1.4.0) Downloading: 100% – Installing sensio/distribution-bundle (v2.2.1) Downloading: 100% – Installing sensio/framework-extra-bundle (v2.2.1) Downloading: 100% – Installing sensio/generator-bundle (v2.2.1) Downloading: 100% – Installing kriswallsmith/assetic (v1.1.0-alpha4) Downloading: 100% – Installing symfony/assetic-bundle (v2.1.2) Downloading: 100% – Installing monolog/monolog (1.4.1) Downloading: 100% – Installing symfony/monolog-bundle (v2.2.0) Downloading: 100% – Installing swiftmailer/swiftmailer (v4.3.0) Downloading: 100% – Installing symfony/swiftmailer-bundle (v2.2.0) Downloading: 100% – Installing twig/extensions (v1.0.0) Downloading: 100% kriswallsmith/assetic suggests installing leafo/lessphp (Assetic provides the integration with the lessphp LESS compiler) kriswallsmith/assetic suggests installing leafo/scssphp (Assetic provides the integration with the scssphp SCSS compiler) kriswallsmith/assetic suggests installing leafo/scssphp-compass (Assetic provides the integration with the SCSS compass plugin) kriswallsmith/assetic suggests installing ptachoire/cssembed (Assetic provides the integration with phpcssembed to embed data uris) monolog/monolog suggests installing doctrine/couchdb (Allow sending log messages to a CouchDB server) monolog/monolog suggests installing ext-amqp (Allow sending log messages to an AMQP server (1.0+ required)) monolog/monolog suggests installing ext-mongo (Allow sending log messages to a MongoDB server) monolog/monolog suggests installing mlehner/gelf-php (Allow sending log messages to a GrayLog2 server) monolog/monolog suggests installing raven/raven (Allow sending log messages to a Sentry server) Generating autoload files Clearing the cache for the dev environment with debug true Installing assets using the hard copy option Installing assets for Symfony\Bundle\FrameworkBundle into web/bundles/framework Installing assets for Acme\DemoBundle into web/bundles/acmedemo Installing assets for Sensio\Bundle\DistributionBundle into web/bundles/sensiodistribution
从命令行结果,我们看到了整个Symfony框架的安装过程与结果。
PHP Composer 定义依赖关系
Composer在使用时会自动寻找composer.json这个文件。 composer.json将用来定义整个项目的依赖包。例如:
{ "require": { "monolog/monolog": "1.2.*" } }
依赖包简单的说明,我们的项目需要一些从1.2开始的任何版本的monolog/monolog包。
Composer是PHP中的一个依赖关系管理工具。通过Composer我们可以在发布软件时节省大量的文件数目和控制依赖包的版本。
PHP Composer 项目
Composer 项目官方:http://getcomposer.org
Composer Github项目:https://github.com/composer/composer
PHP Composer软件包列表:https://packagist.org/

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。

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。

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。

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。


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