In-depth understanding of PHP class and constructor analysis
Everyone has a certain understanding of classes. Here we only introduce the noteworthy aspects of classes in php
----Creation of classes----
php Use the keyword class to create a class, and use a pair of braces
such as:
class name{
public $n="";
private $u="";
public function name() {
$n="233";
$u="23333";
}
public function rename($newn){
$this->n=$newn;//this表示这个类
}
} without a semicolon at the end. Then $n,$u is a field; name() is a constructor (construct() can also define a constructor, see below for details), which can assign values to fields; rename() is a method.
----Field----
Comparison
$obj=new name();
echo $obj->n;
with
$obj=new name();
echo $obj-> ;u;
The former is executable, but the latter is not possible because private is declared before $u. This is similar to c++.
Code:
public static $nm ="2333333333333333" ;
Declares a static field for the function.
The variable can be accessed directly through the class name and ::
echo name::$nm;
This is also similar to c++.
You can also access static fields in the class through self::+$+variable name . At this time, self is equivalent to $this-> ;.
The use of methods is similar to fields
##----Constructor----
class name{
public $n="";
private $u="";
public function construct() {
$n="233";
$u="23333";
}
public function rename($newn){
$this->n=$newn;
}
}
construct($name="",$sex="man",$age=0) {}
When declaring an object
$obj= new name("我","man",28);The above is the detailed content of In-depth understanding of PHP class and constructor analysis. For more information, please follow other related articles on the PHP Chinese website!
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