What is the usage of $ in php

$ is a variable symbol in php. To use it, add the $ symbol to a string to make the string a variable name or object name. Use the syntax such as "class MyClass{private $_val;. ..echo $my->foo();}".

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The $ symbol in php is a variable symbol;

Add the $ symbol to a string. This string is a variable name or object name.

In fact, PHP uses the syntax of C language, but there are some differences. The $ symbol plus a string is a variable name or object name.

For example, the following code: (Recommended learning: PHP programming from entry to proficiency)

class MyClass{
private $_val;
 
public function foo(){
return $this->_val;
}
 
public function foo1(){
return $this->_val;
}
......
}
$my = new MyClass;
echo $my->foo();

MyClass is a class name, no $ sign is needed; $_val is a private variable, usually $ It is composed of an underscore and a string; foo and foo1 are two member functions, so there is no need to add the $ sign; $my is an object, and the $ sign must be added.

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