@Chiang 2020-02-03T14:41:02.000000Z 字数 2324 阅读 531

PSR-1: 基本编码标准

PSR

PSR-1: 基本编码标准

标准的这一部分包括应被认为是确保共享PHP代码之间实现高水平技术互操作性所需的标准编码元素。

本文档中的关键字“必须”，“不得”，“必须”，“应”，“不得”，“应”，“应不”，“推荐”，“可以”和“可选”是按照RFC 2119中的描述进行解释。

概述

文件只能使用<?php和<?=标记。

文件必须使用UTF-8无BOM头来编写PHP代码。

文件既可以申明特征(在类,函数方法,常量,等等),也可以局部申明或引用(比如:打印输出,修改.ini配置项或文件等),当时不能两者都用.

命名空间和类的定义必须遵循自动加载参照PSR4

类的命名必须参考StudlyCaps

类常量必须全是大写字符和下划线分隔符

方法的命名必须参考camelCase

文件

php 标签

PHP编码必须使用长标签<?php ?>或者短标签<?= ?>,不允许使用其他的标签

字符编码

PHP编码只能使用UTF-8无BOM头编码格式

Side Effects (这里我的理解是:`局部申明或引用`)

一个文件中应当申明新的特征(在类,函数方法,常量中,等等),在没有局部引用或申明的前提下,或者应当执行局部申明或引用的逻辑,但是不能两者都用.

“side effects”,数组的意思是:执行逻辑不会关联类,函数方法,常量等申明的配置,仅仅包含引入的文件

“Side effects” 包括但不限于:打印输出,request或者include调用,连接外部服务,修改ini配置,抛出错误和异常,修改全局静态参数,从一个文件读写等等.

The following is an example of a file with both declarations and side effects; i.e, an example of what to avoid:

<?php
// side effect: change ini settings
ini_set('error_reporting', E_ALL);
// side effect: loads a file
include "file.php";
// side effect: generates output
echo "<html>\n";
// declaration
function foo()
{
    // function body
}

The following example is of a file that contains declarations without side effects; i.e., an example of what to emulate:

<?php
// declaration
function foo()
{
    // function body
}
// conditional declaration is *not* a side effect
if (! function_exists('bar')) {
    function bar()
    {
        // function body
    }
}

命名空间和类名

Namespaces and classes MUST follow an “autoloading” PSR: [PSR-0, PSR-4].

This means each class is in a file by itself, and is in a namespace of at least one level: a top-level vendor name.

Class names MUST be declared in StudlyCaps.

Code written for PHP 5.3 and after MUST use formal namespaces.

For example:

<?php
// PHP 5.3 and later:
namespace Vendor\Model;
class Foo
{
}

Code written for 5.2.x and before SHOULD use the pseudo-namespacing convention of Vendor_ prefixes on class names.

<?php
// PHP 5.2.x and earlier:
class Vendor_Model_Foo
{
}

类常量,属性和方法

The term “class” refers to all classes, interfaces, and traits.

constants

Class constants MUST be declared in all upper case with underscore separators. For example:

<?php
namespace Vendor\Model;
class Foo
{
    const VERSION = '1.0';
    const DATE_APPROVED = '2012-06-01';
}

Properties

This guide intentionally avoids any recommendation regarding the use of $StudlyCaps,$ camelCase, or $under_score property names.

Whatever naming convention is used SHOULD be applied consistently within a reasonable scope. That scope may be vendor-level, package-level, class-level, or method-level.

Methods

Method names MUST be declared in camelCase().

参考资料:
PSR-1: Basic Coding Standard
PSR-1 基础编码规范