Two compound types in php variables

1. Array (array), an array can store multiple data and can be of any type.

In fact, an array is equivalent to an ordered chart that maps values ​​to keys.

 <?php
/*
array(
key1 => value1,
key2 => value2,
...
)
The key can be an integer or character type, and the value can be any type*/
$arr = array("foo" => "bar", 12 => true);
print_r($arr); // View the entire contents of the value echo $arr["foo"]; // Access a single data through array subscript echo $arr[12]; // Access a single data through array subscript

2. Object. Object is a composite data type that is more advanced than arrays.

Object variables consist of a set of methods and a set of property values. The method represents the function of the object, and the properties represent the state of the object.

 <?php
class Person{ // Define a class var $name; // Define a member attribute function in the class say(){ // Define a member method echo "Doing foo.";
}
}
$p = new Person; // Use the new statement to instantiate an object of class Person and place it in the variable $p $p->name = "Tom"; // Access the member properties in the object through the object $p $p->say (); // Access member methods in the object through object $P

The above are the two compound types in php variables. I hope it will be helpful to everyone.