How to use array_replace function in PHP to replace one array with another array

In PHP development, it is often necessary to use arrays to store and operate data. Sometimes we need to replace the values ​​of one array with the values ​​of another array. In this case, we can use the array_replace function to complete this operation.

The array_replace function is a built-in function provided by PHP, which can replace the corresponding value in another array with the value of one or more arrays. The syntax of this function is as follows:

array array_replace ( array $array , array $array1 [, array $... ] )

The parameters of this function are as follows:

• array: the input array;
• array1: used to replace the input array elements Array;
• ...: You can specify multiple arrays to replace the input array elements.

The array_replace function will replace the value in array1 with the element of the corresponding key name in array. If the key name that exists in array does not exist in array1, the element with this key name will be retained.

The following is an example of using the array_replace function:

<?php
//原数组
$fruits = array(
    "apple" => "apple",
    "banana" => "banana",
    "orange" => "orange"
);

//要替换的数组
$replace = array(
    "banana" => "peach",
    "orange" => "watermelon"
);

//使用array_replace函数
$result = array_replace($fruits, $replace);

//输出结果
print_r($result);
?>

Running the above code will output the following results:

Array
(
    [apple] => apple
    [banana] => peach
    [orange] => watermelon
)

You can see that when using the array_replace function, the The banana and orange elements are replaced with the values ​​in the array to be replaced, while the other elements remain unchanged.

It should be noted that the array_replace function will return a new array without modifying the original array.

If you want to replace multiple arrays when using the array_replace function, just pass multiple arrays as arguments to the function. For example, the following code demonstrates how to use three arrays to replace the values ​​in the original array:

<?php
//原数组
$fruits = array(
    "apple" => "apple",
    "banana" => "banana",
    "orange" => "orange"
);

//要替换的数组
$replace1 = array(
    "banana" => "peach",
    "orange" => "watermelon"
);

//要替换的数组
$replace2 = array(
    "apple" => "pear"
);

//要替换的数组
$replace3 = array(
    "pear" => "kiwi"
);

//使用array_replace函数
$result = array_replace($fruits, $replace1, $replace2, $replace3);

//输出结果
print_r($result);
?>

Running the above code will output the following results:

Array
(
    [apple] => pear
    [banana] => peach
    [orange] => watermelon
    [pear] => kiwi
)

In short, the array_replace function is a very Useful function that can be conveniently used in PHP development to replace elements in an array.

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