How to modify array members in php

In PHP, modifying array members is a common task because arrays are one of the most commonly used data structures in PHP. There are several different ways to modify array members in PHP, you can modify element values ​​directly on the original array, or you can use built-in PHP functions to modify the array. This article will introduce several methods to modify PHP array members.

1. Directly modify array members

The array in PHP is an ordered collection of key-value pairs. We can access the elements in the array by key name. To modify an array member, we can directly access the array element by key name and then modify its value to the new value. For example:

$myArray = array("apple", "banana", "cherry");
$myArray[1] = "orange";
print_r($myArray);

This code will output Array ( [0] => apple [1] => orange [2] => cherry ). In this example, we use the [] operator to access the second element (key 1) in the array $myArray and change its value to "orange".

2. Use built-in functions to modify array members

In addition to directly modifying array members, PHP also provides some built-in functions that can easily modify array members. These functions include: array_push()、array_pop()、array_shift()、array_unshift()、array_splice()

1. array_push()

array_push() The function adds one or more elements to the end of an array. Its syntax is as follows:

array_push(array, value1, value2, ...)

Example:

$myArray = array("apple");
array_push($myArray, "banana", "cherry");
print_r($myArray);

This example will output Array ( [0] => apple [1] => banana [2] => cherry ). In this example, we have added two new elements "banana" and "cherry" at the end of the array $myArray.

2. array_pop()

array_pop() The function deletes the last element in the array. Its syntax is as follows:

array_pop(array)

Example:

$myArray = array("apple", "banana", "cherry");
array_pop($myArray);
print_r($myArray);

This example will output Array ( [0] => apple [1] => banana ). In this example, we delete the last element "cherry" in the array $myArray.

3. array_shift()

array_shift() The function deletes the first element in the array. Its syntax is as follows:

array_shift(array)

Example:

$myArray = array("apple", "banana", "cherry");
array_shift($myArray);
print_r($myArray);

This example will output Array ( [0] => banana [1] => cherry ). In this example, we delete the first element "apple" in the array $myArray.

4. array_unshift()

array_unshift() The function adds one or more elements to the beginning of an array. Its syntax is as follows:

array_unshift(array, value1, value2, ...)

Example:

$myArray = array("apple", "banana");
array_unshift($myArray, "cherry", "orange");
print_r($myArray);

This example will output Array ( [0] => cherry [1] => orange [2] => apple [3] => banana ). In this example, we have added two new elements "cherry" and "orange" at the beginning of the array $myArray.

5. array_splice()

array_splice() The function can be used to slice the array and add, delete and replace elements in the array. . Its syntax is as follows:

array_splice(array, start, length, replacement)

Parameter description:

• array: The target array to be operated on
• start: Start adding, deleting or replacing operations from this index
• length: The number of elements to be deleted. If the elements are not deleted, you can set it to 0.
• replacement: The new elements to be added to the array. If only the deletion operation is performed, then This parameter is not required

Example:

$myArray = array("apple", "banana", "cherry", "orange");
array_splice($myArray, 1, 2, array("pear", "kiwi"));
print_r($myArray);

This example will output Array ( [0] => apple [1] => pear [2] =&gt ; kiwi [3] => orange ). In this example, we removed two elements "banana" and "cherry" starting at index 1, and then added two new elements "pear" and "kiwi".

3. Summary

In PHP, modifying array members is a basic task. We can access and modify the values ​​of array elements directly through key names, or we can use built-in functions to add, delete, and replace array elements. Proficient in array operation skills can allow us to develop PHP applications more efficiently.

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