How to modify the value of the specified key in the array in php

In PHP, array is a very common data type. If you need to modify the value of a specified key in an array, you can use the following method to achieve it.

Suppose there is the following array:

$fruits = array(
    "apple" => 2,
    "banana" => 1,
    "orange" => 3
);

Now we need to modify the value of "banana" to 2. You can use the following code to complete it:

$fruits["banana"] = 2;

Use directly something like The method of assignment is to use the key to be modified as the index and assign the new value to it.

If the array where the key to be modified is located is relatively deep, you can use a loop to achieve it. For example, we want to modify the value of "orange" in the following array to 4:

$all_fruits = array(
    "fruits" => array(
        "apple" => 2,
        "banana" => 1,
        "orange" => 3
    ),
    "vegetables" => array(
        "carrot" => 5,
        "celery" => 2,
        "spinach" => 1
    )
);

You can use the following code to complete it:

foreach ($all_fruits['fruits'] as $key => $value) {
    if ($key == 'orange') {
        $all_fruits['fruits'][$key] = 4;
    }
}

A foreach loop is used here to traverse "fruits" in the $all_fruits array "In the array corresponding to this key, once the key "orange" is found, its value is modified to 4.

In addition to the above methods, you can also use the array_replace() function to replace the specified key in the original array with a new value. For example, if we want to replace the value of "orange" in the $all_fruits array with 5, we can use the following code:

$new_fruits = array_replace($all_fruits['fruits'], array("orange" => 5));
$all_fruits['fruits'] = $new_fruits;

At this time, the value of "orange" in the $all_fruits array becomes 5.

In general, there are many ways to modify the specified key in the array in PHP, and the above are just a few of the common writing methods. Depending on the actual situation and needs, you can choose different ways to perform modification operations.

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