How to replace value in php array

PHP is a widely used server-side scripting language used to develop web applications and dynamic websites. In PHP, an array is a very common data type that can hold multiple values ​​and use these values ​​to perform various calculations and operations. In some cases, you may need to replace specific values ​​in a PHP array. In this article, we will discuss how to replace values ​​using PHP arrays.

PHP Array Overview

In PHP, an array is a composite data type that allows you to store multiple values ​​in a single variable. PHP arrays can be numerically indexed arrays or associative arrays. A numerically indexed array is a collection of values ​​sorted in order, while an associative array is a collection of values ​​with a key.

The following is an example of a PHP array using numeric indexing:

$fruits = array("apple", "orange", "banana", "grape");

In this example, we create an array named $fruits that contains four elements: apple, orange, banana and grape. The first element of the array has index 0, the second element has index 1, and so on.

The following is an example of a PHP array using an associative array:

$person = array("name" => "John", "age" => 32, "city" => "New York");

In this example, we create an array named $person, which consists of three key-value pairs: name, age and city. Each key has an associated value.

Replace values ​​in PHP numeric index arrays

In PHP, you can use array indexing to replace specific items with new values. For example, if you want to change the first element in the above example from apple to pear, do this as follows:

$fruits[0] = "pear";

This will replace the first element of the array with pear. Same logic, you can use array indexing to change other single values.

Replacing values ​​in PHP associative arrays

In PHP, there are many ways to replace values ​​in associative arrays, since they are sorted by key rather than index. Here are some simple ways.

Use element key:

$person["name"] = "Peter";

This will replace the value of the "name" element in the array with Peter.

Use the array_replace() function:

PHP array_replace() function accepts two or more arrays and returns a new array containing a combination of the key values ​​of one or more arrays . This function uses elements from each input array to create a new array, where the last input array overwrites the values ​​of all previous arrays for duplicate keys. So, we can use it to replace values ​​in PHP's associative array in the following way:

$person = array_replace($person, array("name" => "Peter", "age" => 35));

In this example, we will enter a new associative array containing new values ​​to replace the existing $person array value in . Since we are passing a new array, the values ​​of the last input array will overwrite the values ​​of all previous arrays for the duplicate keys.

Use another array:

$person = array("name" => "Peter", "age" => 35, "city" => "San Francisco");

This is one of the most basic methods, we can directly allocate a new associative array to replace the values ​​in the existing $person array.

Conclusion

PHP array is a very convenient data type that can hold multiple values. In some cases, you may need to replace specific values ​​in a PHP array. This article explains how to replace values ​​using PHP arrays, including different ways to replace values ​​in numerically indexed arrays and associative arrays. Apparently this is the basis of array-based data exchange in PHP.

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