Explore how to merge two arrays into one array in PHP

PHP is a popular server-side scripting language used for developing web applications. Merging two arrays is one of the common operations in PHP. In this article, we will explore several ways to combine two arrays into one in PHP.

1. Using the array_merge function

The array_merge function is one of the standard methods for merging arrays in PHP. This function takes multiple arrays as arguments and returns the union result of these arrays.

The following is a sample code that uses the array_merge function to merge two arrays:

$array1 = array("name" => "John", "age" => 30);
$array2 = array("height" => 175, "weight" => 75);
$result = array_merge($array1, $array2);
print_r($result);

The above code will output the merged array:

Array
(
    [name] => John
    [age] => 30
    [height] => 175
    [weight] => 75
)

2. Use operator

Operators in PHP can also be used to merge two arrays. This operator appends an array to another array and returns the new array.

The following is a sample code that uses operators to combine two arrays:

$array1 = array("name" => "John", "age" => 30);
$array2 = array("height" => 175, "weight" => 75);
$result = $array1 + $array2;
print_r($result);

The above code will output the combined array:

Array
(
    [name] => John
    [age] => 30
    [height] => 175
    [weight] => 75
)

3. Use the array_replace function

array_replace function is used to merge multiple arrays and overwrite the previous array with the later array. If the same key exists in the previous array, the value in the later array will overwrite the value in the previous array. .

The following is a sample code that uses the array_replace function to merge two arrays:

$array1 = array("name" => "John", "age" => 30);
$array2 = array("name" => "Peter", "height" => 175, "weight" => 75);
$result = array_replace($array1, $array2);
print_r($result);

The above code will output the merged array:

Array
(
    [name] => Peter
    [age] => 30
    [height] => 175
    [weight] => 75
)

Summary

There are many ways to combine two arrays into one in PHP. We can use array_merge function, operator or array_replace function. In practical applications, we can choose the most appropriate method to complete the operation according to our needs.

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