How to change a value of an array in php

When developing a website, an array is an essential data structure that can store a set of related values. Sometimes, we need to modify a value in the array. This article will introduce how to use PHP to change a certain value of an array.

PHP provides a variety of methods to modify the value of an array, including the following.

1. Use subscripts to directly modify

The subscripts of PHP arrays support numbers and strings. We can directly use subscripts to modify a certain value of the array, for example:

<?php     
$array = array(&#39;a&#39; => 1, 'b' => 2, 'c' => 3);
$array['b'] = 4;
print_r($array);
?>

Running result:

Array
(
    [a] => 1
    [b] => 4
    [c] => 3
)

As you can see, the above code changes the value of the 'b' subscript in the array $array Modified from 2 to 4.

2. Use the array_splice function

The array_splice function can modify the array by deleting elements in the array and adding new elements. We can use this function to directly replace an element in an array. For example:

<?php     
$array = array(&#39;a&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;);
array_splice($array, 1, 1, &#39;e&#39;);
print_r($array);
?>

Run result:

Array
(
    [0] => a
    [1] => e
    [2] => c
    [3] => d
)

The above code replaces the element "b" with subscript 1 in the array $array with "e".

3. Use the array_replace function

The array_replace function can replace the values ​​of one or more arrays with another array. We can use this function to directly replace an element in an array. For example:

<?php     
$array1 = array(&#39;a&#39; => 1, 'b' => 2, 'c' => 3);
$array2 = array('b' => 4);
$array = array_replace($array1, $array2);
print_r($array);
?>

Run result:

Array
(
    [a] => 1
    [b] => 4
    [c] => 3
)

The above code changes the value of the element subscripted "b" in the array $array1 from 2 to 4.

4. Use the list function

The list function can assign the values ​​in the array to a series of variables. We can use this function to directly modify an element in the array. For example:

<?php     
$array = array(&#39;a&#39;, &#39;b&#39;, &#39;c&#39;, &#39;d&#39;);
list($array[1]) = array(&#39;e&#39;);
print_r($array);
?>

Run result:

Array
(
    [0] => a
    [1] => e
    [2] => c
    [3] => d
)

The above code replaces the element "b" with subscript 1 in the array $array with "e".

Summary

The above are several ways to modify a value in an array in PHP. In different situations, we can choose different methods to modify the elements in the array. Being proficient in these methods can make us more comfortable when developing websites.

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