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PHP uses the syntax of C language, but there are some differences. "$" is a symbol used to define variables or objects in PHP. The method of using "$" is: "$" plus a string that matches the PHP variable name definition form a variable.
For example:
class Test { private $a; //定义变量 public function foo1(){ return $this->a; } public function foo2(){ return $this->a; } }
$test = new Test; echo $test->foo1();
Test is a class name, no $ symbol is needed; $a is a private variable, usually composed of $ and a string; foo1 and foo2 are two member variables, There is no need to add the $ sign; $test is an object and must be added with the $ sign.
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