Hello Steemit friends, so I was learning PHP and discovered so many symbol were used in PHP programming language, such as __, @, ->, =>, :: so let list them down and study them all

大家好，今天继续学习PHP，发现里面的怪符号都有不同的功能，就让我们一起学习吧

The use of __ (two underscore)

• this is use for all the translation of the language, example
  这个是用来翻译用的，在所有你要翻译的字的前面加这个符号，以后要翻译就容易

echo __("Hello, world!"); // Bonjour, monde!

So if you have 3 language, when you switch the language, it will switch to the language you choose

The use of @ in front of the function

• this will suppress all warning or error so that it won’t crash your website but you will never know what is the error
  这个是用来避免电脑告诉你错误，免的网站运行不到，可是这样一来有什么错误你就不会知道

Example

$fileHandle = @fopen($fileName, $writeAttributes);

since you put the @ in front of the function fopen, so if you failed to open the file for any reason the computer will never tell you

The use of =>

• this is used to assign values to the keys of an array
  这个是用来给你的array设定数据

Example

$myArray = array(
    0 => 'Big',
    1 => 'Small',
    2 => 'Up',
    3 => 'Down'
);

The use of ->

• this is used to access method or property of an object
  这个是用来拿object里的method或property

Example

// Create a new instance of MyObject into $obj
$obj = new MyObject();
// Set a property in the $obj object called thisProperty
$obj->thisProperty = 'Fred';
// Call a method of the $obj object named getProperty
$obj->getProperty();

The use of ::

is a token that allows access to static, constant, and overridden properties or methods of a class
这个用来读取object里的constant variable

Example

<?php
class MyClass {
    const CONST_VALUE = 'A constant value';
}


echo MyClass::CONST_VALUE;
?>

thanks for reading
谢谢阅读