What are the two ways to assign values to php arrays?
In PHP, we usually use arrays to store a set of data. There are two main ways to assign values to arrays: ordinary assignment and reference assignment.
- Ordinary assignment
Ordinary assignment refers to assigning a value or expression directly to an array element. This assignment method is often used to create a static array or add a new value to an array. Add elements. The specific implementation syntax is: $array[index] = value, where index can be an integer or a string, indicating the key name of the array element, and value is the value or expression to be assigned.
The following is a sample code:
1 2 3 4 5 6 7 8 9 |
|
In the above code, we first use the array()
function to create an array containing three elements: integer 1
, string "hello"
and floating point number 3.14
. Next, we add a Boolean value and a string element via $arr[3] = true
and $arr["test"] = "world"
respectively. Finally, we use the print_r()
function to output the contents of the array. The output result is as follows:
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|
We can see that the two newly added elements are represented by integers 3
and the string "test"
are added to the array as key names.
- Reference assignment
Reference assignment (also called pass by reference) means that when the value of an array element is passed to a variable, the variable is not one of the values. copy, but points directly to the address of the element. This assignment method is often used to transfer large arrays or multiple nested arrays, which can improve program efficiency. The specific implementation syntax is: $var = &$array[index], where $var
is the variable to be assigned, $array
is the array name, index
is the key name of the element to be retrieved, and &
is the reference symbol in PHP.
The following is a sample code:
1 2 3 4 5 6 7 8 9 10 11 12 13 |
|
In the above code, we first use the array()
function to create an array containing three elements. Next, we assign the first and second elements of the array to # by $a = &$arr[0]
and $b = &$arr[1]
respectively. The two variables ##$a and
$b. Next, we modify the values of
$a and
$b and output the array. The output is as follows:
1 2 3 4 5 6 |
|
$a and
$b, the values of the first and second elements of the array also change made corresponding changes.
The above is the detailed content of What are the two ways to assign values to php arrays?. For more information, please follow other related articles on the PHP Chinese website!

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