在合作开发时需要统一下code style，如给method写annotation时一些tag如@params ,@throw,@return得按照字母顺序来写，等等。推荐一个package:friendsofphp/php-cs-fixer，该package是Symfony作者写的，质量有保证。
安装下该package:

composer require friendsofphp/php-cs-fixer --dev

然后项目根目录创建一个可执行文件如.cs文件：

#!/bin/bash

vendor/bin/php-cs-fixer fix

以后在项目根目录只需执行./cs就可以自动修复不复合规定code style的代码，code rules的定义在该package packgist的网站上有说明。vendor/bin/php-cs-fixer fix会读取.php_cs文件返回的code rules，所以还得定义哪些code rules，同样在项目根目录中新建文件.php_cs，然后加上code rules，如:

<?php

$finder = Symfony\CS\Finder\DefaultFinder::create()
            ->exclude('bootstrap')
            ->exclude('database')
            ->exclude('public')
            ->exclude('resources')
            ->exclude('storage')
            ->exclude('vendor')
            ->notPath('.phpstorm.meta.php')
            ->notPath('_ide_helper.php')
            ->notPath('server.php')
            ->in(__DIR__);

return Symfony\CS\Config::create()
    ->level(Symfony\CS\FixerInterface::PSR2_LEVEL)
    ->fixers([
    // Use all symfony fixers but the following '-'.'fixer'.

        // Exclude psr-0
        '-psr0',

        // Concatenation should be used without spaces.
        '-concat_without_spaces',

        // A return statement wishing to return nothing should be simply "return".
        '-empty_return',

        // Remove useless semicolon statements.
        '-no_empty_comment',

        // Binary operators should be surrounded by at least one space.
        '-operators_spaces',

        // Phpdocs annotation descriptions should not end with a full stop.
        '-phpdoc_annotation_without_dot',

        // @return void and @return null annotations should be omitted from phpdocs.
        '-phpdoc_no_empty_return',

        // @package and @subpackage annotations should be omitted from phpdocs.
        '-phpdoc_no_package',

        // All items of the @param, @throws, @return, @var, and @type phpdoc tags must be aligned vertically.
        '-phpdoc_params',

        // Annotations in phpdocs should be grouped together so that annotations of the same type immediately follow each other,
        // and annotations of a different type are separated by a single blank line.
        '-phpdoc_separation',

        // Phpdocs short descriptions should end in either a full stop, exclamation mark, or question mark.
        '-phpdoc_short_description',

        // Docblocks should only be used on structural elements.
        '-phpdoc_to_comment',

        // Pre incrementation/decrementation should be used if possible.
        '-pre_increment',

        // Unalign double arrow symbols.
        '-unalign_double_arrow',

        // Unalign equals symbols.
        '-unalign_equals',

    // Use all the following fixers.
        // Align double arrow symbols in consecutive lines.
        'align_double_arrow',

        // Align equals symbols in consecutive lines.
        'align_equals',

        // Concatenation should be used with at least one whitespace around.
        'concat_with_spaces',

        // Replace deprecated ereg regular expression functions with preg.
        'ereg_to_preg',

        // Add, replace or remove header comment.
        // 'header_comment',

        // Multi-line whitespace before closing semicolon are prohibited.
        'multiline_spaces_before_semicolon',

        // Ensure there is no code on the same line as the PHP open tag.
        'newline_after_open_tag',

        // There should not be an empty return statement at the end of a function.
        'no_useless_return',

        // Ordering use statements.
        'ordered_use',

        // Convert PHP4-style constructors to __construct.
        'php4_constructor',

        // PHPUnit assertion method calls like "->assertSame(true, $foo)" should be written with dedicated method like "->assertTrue($foo)".
        'php_unit_construct',

        // PHPUnit methods like "assertSame" should be used instead of "assertEquals".
        'php_unit_strict',

        // Annotations in phpdocs should be ordered so that param annotations come first,
        // then throws annotations, then return annotations.
        'phpdoc_order',

        // PHP arrays should use the PHP 5.4 short-syntax.
        'short_array_syntax',

        // Replace short-echo <?= with long format <?php echo syntax.
        'short_echo_tag',

        // Comparison should be strict.
        'strict',

        // Functions should be used with $strict param.
        'strict_param',

        // Remove trailing whitespace at the end of blank lines.
        'whitespacy_lines',
    ])
    ->finder($finder)
    ->setUsingCache(true);

code rules可以添加或删除，需要团队统一，一般至少尽量符合PSR-2的大部分标准。每一个code rule的定义可以参考package packgist的主页。

这样，团队里以后每次push code前先./cs下：

当然，还应当在PHPStorm IDE里的Preference->Editor->Code Style->PHP里也设置同样的code rules，然后导出一个xml文件，方便在团队里共享并导入到每个开发者的PHPStorm，这样保证团队的每一个Code Style保持相同。