What are the assignment methods in php?

The assignment methods in PHP are: 1. Direct assignment, use the "=" operator to directly assign a value to a variable; 2. Reference assignment, use the "=&" operator to assign a reference to a variable to another Variables; 3. Dynamic assignment, using variable variables to assign values ​​through the string form of variable names; 4. Array assignment, assigning an array to another variable; 5. List assignment, assigning the value of an array to a group Variables can be assigned multiple values ​​at one time; 6. Object assignment, assign an object to a variable; 7. Use the extended form of the assignment operator, such as =, -=, etc.

The operating environment of this article: Windows 10 system, php8.1.3 version, dell g3 computer.

In PHP, there are many ways to assign values ​​to variables. The following are common assignment methods:

1. Direct assignment: Use the "=" operator to directly assign a value to a variable.

$var = "Hello World";

2. Reference assignment: Use the "=&" operator to assign a reference to one variable to another variable. This means that both variables will point to the same data, and changing the value of one variable will affect the other variable.

$var1 = "Hello";
$var2 =& $var1;
$var2 = "World";
echo $var1; // 输出 "World"
echo $var2; // 输出 "World"

3. Dynamic assignment: Use variable variables to assign values ​​through the string form of the variable name.

$var = "value";
$$var = 100;
echo $value; // 输出 100

4. Array assignment: assign an array to another variable.

$arr1 = array(1, 2, 3);
$arr2 = $arr1;
$arr2[0] = 10;
print_r($arr1); // 输出 Array ( [0] => 1 [1] => 2 [2] => 3 )
print_r($arr2); // 输出 Array ( [0] => 10 [1] => 2 [2] => 3 )

5. List assignment: Assign the value of an array to a set of variables. Multiple values ​​can be assigned at one time.

list($var1, $var2, $var3) = array("a", "b", "c");
echo $var1; // 输出 "a"
echo $var2; // 输出 "b"
echo $var3; // 输出 "c"

6. Object assignment: assign an object to a variable.

class MyClass {
public $value = "Hello";
}
$obj = new MyClass();
$var = $obj->value;
echo $var; // 输出 "Hello"

In addition to the above methods, you can also use the extended form of the assignment operator, such as =, -=, *=, /=, etc. These extended forms are ways of operating on and assigning values ​​to the variables themselves.

The above are common assignment methods in PHP. Choose the appropriate method to assign values ​​to variables according to actual needs.

The above is the detailed content of What are the assignment methods in php?. For more information, please follow other related articles on the PHP Chinese website!