PHP replaces another number with an array

PHP is a scripting language widely used in the field of web development. Array is one of the important data types in PHP, which can be used to store a set of related data. In PHP, if we want to replace an array with another number, what should we do? This article will introduce it to you in detail.

1. Understanding arrays

In PHP, an array is a special variable that can store multiple values. Think of an array as a table where each cell stores a specific value.

There are two types of arrays in PHP: indexed arrays and associative arrays. An indexed array has a numeric key for each value, whereas an associative array has a string key for each value.

The following is an example of a simple indexed array:

$numbers = array(1, 2, 3, 4, 5);

The array will store integer values ​​from 1 to 5. We can access a specific element in an array through its name and an index value. For example, if we want to access the third element, we can use the following method:

$third_number = $numbers[2];

Similarly, we can also create an associative array by:

$person = array("name" => "John", "age" => 30, "city" => "New York");

The array will store A person's name, age and city. We can use the key of an associative array to access a specific element in the array. For example, if we want to visit this person's city, we can use the following method:

$person_city = $person["city"];

2. Array replacement

Sometimes, we need to replace all the values ​​​​in an array with another a number. In PHP, we can use the array_fill function to quickly generate an array with all the same values.

$new_numbers = array_fill(0, count($numbers), 10);

This code will create a new array with the same size as the $numbers array, with the value of all elements being 10. We can use the print_r function to view the contents of the new array:

print_r($new_numbers);

The output result should be:

Array ( [0] => 10 [1] => 10 [2] => 10 [3] => 10 [4] => 10 )

This successfully converts the $numbers array All values ​​in are replaced with 10.

The same is true if you want to replace all the values ​​in the associative array with a number. You can first use the array_keys function to get all the keys of the associative array, and then use the array_fill_keys function to create a new array where all values ​​are the same.

For example, if we want to replace a person's age, height and weight with 30, we can use the following code:

$keys = array_keys($person);
$new_person = array_fill_keys($keys, 30);

All elements in this new array are 30, corresponding to for each key in the original associative array.

3. Conclusion

Array is one of the very practical data types in PHP, which can be used to store and operate a set of related data. When you need to replace an array with another number, you can use the array_fill and array_fill_keys functions to quickly generate a new array.

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