How to add value to array in php

In PHP, array is a very important and practical data type. During the development process, we usually need to add new values ​​​​to the array in order to better operate and process the data. This article will introduce how to add values ​​to an array in PHP.

1. Add values ​​through assignment

In PHP, we can add new values ​​to the array through simple assignment. We just need to specify the array subscript and assign the new value to it. The specific examples are as follows:

$myArray = array('apple', 'banana', 'cherry');
$myArray[3] = 'date';
print_r($myArray);
// 输出结果：Array ( [0] => apple [1] => banana [2] => cherry [3] => date )

In the above example, we first created an array and added three elements in two ways. Then, we add a new element to the array using $myArray[3] = 'date'.

2. Add values ​​through the array_push() function

PHP provides the built-in function array_push(), which can add one or more elements to the end of the array. The specific examples are as follows:

$myArray = array('apple', 'banana', 'cherry');
array_push($myArray, 'date', 'elderberry');
print_r($myArray);
// 输出结果：Array ( [0] => apple [1] => banana [2] => cherry [3] => date [4] => elderberry )

In the above example, we first created an array and added three elements in two ways. We then added two new elements at the end of the array using the array_push() function.

3. Add values ​​through the array_unshift() function

Similar to the array_push() function, PHP also provides the function array_unshift() for adding one or more elements to the head of the array. The specific examples are as follows:

$myArray = array('apple', 'banana', 'cherry');
array_unshift($myArray, 'date', 'elderberry');
print_r($myArray);
// 输出结果：Array ( [0] => date [1] => elderberry [2] => apple [3] => banana [4] => cherry )

In the above example, we first created an array and added three elements in two ways. Then, we use the array_unshift() function to add two new elements to the head of the array.

4. Add values ​​through loop

Sometimes, we need to add elements from one array to another array. This can be achieved using a loop. The specific example is as follows:

$myArray = array('apple', 'banana', 'cherry');
$otherArray = array('date', 'elderberry');
foreach ($otherArray as $value) {
    $myArray[] = $value;
}
print_r($myArray);
// 输出结果：Array ( [0] => apple [1] => banana [2] => cherry [3] => date [4] => elderberry )

In the above example, we first created an array $myArray and added three elements in two ways. Then, we create another array $otherArray and add its elements to $myArray one by one through a loop.

Summary:

Through the introduction of this article, we can see that there are many ways to add new values ​​to an array in PHP. We can achieve this through simple assignment methods, array_push() function, array_unshift() function, loops and other methods. They each have their own characteristics, and we can choose the most suitable method for operation according to the actual situation.

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