How to transpose array values ​​in PHP7

PHP is a very practical programming language. It has many powerful functions, one of the important functions is arrays. Array is a data structure that stores large amounts of data. PHP provides a variety of methods for operating arrays, such as adding, deleting, updating, sorting, etc. This article will introduce how to use PHP7 to transpose the values ​​​​of an array.

1. Overview of arrays in PHP7

In PHP7, an array is a composite type of data that can save multiple values. These values ​​can be of any type, such as integers and floating point numbers. , string, object, etc. The elements of the array can be accessed through key-value pairs, where the key is a unique identifier and the value is the corresponding data. In PHP7, there are two ways to define an array:

1. Use the array() function to define an array

$my_array = array("foo", "bar", "baz");

2. Use square brackets ([]) to Define array

$my_array = ["foo", "bar", "baz"];

2. Array operations in PHP7

Array operations in PHP7 are very powerful, and you can easily add, delete, update, sort and other operations on arrays. The following are some commonly used array operations:

1. Add array elements

In PHP7, you can use the array_push() function to add elements to the end of the array, or you can directly add elements to the array. New elements.

$my_array = ["foo", "bar"];
array_push($my_array, "baz");
print_r($my_array);  // output: Array ( [0] => foo [1] => bar [2] => baz )

$my_array[] = "qux";
print_r($my_array);  // output: Array ( [0] => foo [1] => bar [2] => baz [3] => qux )

2. Delete array elements

In PHP7, you can use the unset() function to delete the specified element in the array, or you can use the array_pop() function to delete the end element.

$my_array = ["foo", "bar", "baz"];
unset($my_array[1]);
print_r($my_array);  // output: Array ( [0] => foo [2] => baz )

array_pop($my_array);
print_r($my_array);  // output: Array ( [0] => foo [2] => baz )

3. Update array elements

In PHP7, you can easily update the elements at the specified position in the array.

$my_array = ["foo", "bar", "baz"];
$my_array[1] = "qux";
print_r($my_array);  // output: Array ( [0] => foo [1] => qux [2] => baz )

4. Sorting array elements

In PHP7, you can use the sort() function or ksort() function to sort the array. The former sorts the array elements, and the latter sorts the array keys. Sort.

$my_array = [3, 5, 1, 4, 2];

sort($my_array);
print_r($my_array);  // output: Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )

$my_array = ["c" => 3, "a" => 5, "e" => 1, "d" => 4, "b" => 2];

ksort($my_array);
print_r($my_array);  // output: Array ( [a] => 5 [b] => 2 [c] => 3 [d] => 4 [e] => 1 )

3. Array value transposition operation in PHP7

In PHP7, there are many ways to transpose array values. The following is the specific code implementation of the two methods:

1. Use the array_reverse() function

The array_reverse() function can reverse the order of the array elements, but it will return a new array , does not affect the original array.

$my_array = ["foo", "bar", "baz", "qux"];
$new_array = array_reverse($my_array);
print_r($my_array);  // output: Array ( [0] => foo [1] => bar [2] => baz [3] => qux )
print_r($new_array); // output: Array ( [0] => qux [1] => baz [2] => bar [3] => foo )

2. Implement the transposition operation by creating a new empty array

You can create a new empty array, use a for loop to traverse the elements in the original array, and then add them in sequence Implement the transposition operation in the new array. This method can be very flexible and can perform transposition operations on specified positions in the array.

$my_array = ["foo", "bar", "baz", "qux"];
$new_array = [];

for ($i = count($my_array) - 1; $i >= 0; $i--) {
  $new_array[] = $my_array[$i];
}

print_r($my_array);  // output: Array ( [0] => foo [1] => bar [2] => baz [3] => qux )
print_r($new_array); // output: Array ( [0] => qux [1] => baz [2] => bar [3] => foo )

The above are two methods on how to transpose array values ​​in PHP7. In the actual development process, the appropriate method can be selected according to specific needs. I hope this article can help PHP7 novices better master the array operations of PHP7.

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