亲,给个答案吧
$out =
END;
echo $out;
是什么意思?
------解决方案--------------------
定义了一个字符串 $out php heredoc
http://apps.hi.baidu.com/share/detail/15604411
------解决方案--------------------
Heredoc结构
第三种定义字符串的方法是用heredoc句法结构:
结束时所引用的标识符必须在一行的开始位置, 而且,标识符的命名也要像其它标签一样遵守PHP的规则:只能包含 字母、数字和下划线,并且不能用数字和下划线作为开头。
Warning
要注意的是结束标识符这行除了 可能有一个分号(;)外,绝对不能包括 其它字符。这意味着标识符不能缩进,分号的前后也不能有任何空白或tabs。更重要的是结束标识符的前面必须是个被本地 操作系统认可的新行标签,比如在UNIX和Mac OS X系统中是\n ,而结束标识符(可能有个分号)的后面也必须跟个 新行标签。
如果不遵守该规则导致结束标签不“干净”,PHP将认为它不是结束标识符而继续寻找。如果在文件结束前也没有找到一个正确的结束标识符,PHP将会在最后一 行产生一个句法错误。
Heredocs结构不能用来初始化class,而从PHP 5.3以后,则该限制只能用在包含变量的情况下。
Example #1 非法的示例
class foo {
public $bar = bar
EOT;
}
?>
Heredoc结构就象是没有使用双引号的双引号字符串, 这就是说在heredoc结构中引号不用被替换,但是上文中列出的字符 (\n等)也可使用。 变量将被替换,但在heredoc结构中字符串表达复杂变量时,要格外小 心。
Example #2 Heredoc结构的字符串示例
$str = Example of string
spanning multiple lines
using heredoc syntax.
EOD;
/* 含有变量的更复杂示例 */
class foo
{
var $foo;
var $bar;
function foo()
{
$this->foo = 'Foo';
$this->bar = array('Bar1', 'Bar2', 'Bar3');
}
}
$foo = new foo();
$name = 'MyName';
echo My name is "$name". I am printing some $foo->foo.
Now, I am printing some {$foo->bar[1]}.
This should print a capital 'A': \x41
EOT;
?>
以上例程会输出:
My name is "MyName". I am printing some Foo.
Now, I am printing some Bar2.
This should print a capital 'A': A
也可以把Heredoc结构用在函数参数中来传输数据:
Example #3 Heredoc结构在参数中的示例
var_dump(array(foobar!
EOD
));
?>
在PHP 5.3.0以后,也可以用Heredoc结构来初始化静态变量和类的属性和常量:
Example #4 使用Heredoc结构来初始化静态值
// 静态变量
function foo()
{
static $bar = Nothing in here...
LABEL;
}
// 类的常量、属性
class foo
{
const BAR = Constant example
FOOBAR;
public $baz = Property example
FOOBAR;
}
?>
在PHP 5.3.0中还在Heredoc结构中用双引号来声明标志符:
Example #5 在heredoc结构中使用双引号
echo Hello World!
FOOBAR;
?>
Note:
PHP4才引入了Heredoc结构。

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

MantisBT
Mantis is an easy-to-deploy web-based defect tracking tool designed to aid in product defect tracking. It requires PHP, MySQL and a web server. Check out our demo and hosting services.

Dreamweaver Mac version
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

PhpStorm Mac version
The latest (2018.2.1) professional PHP integrated development tool

WebStorm Mac version
Useful JavaScript development tools