How to set php arrays in batches

The three methods for batch setting of PHP arrays are as follows: 1. Use the array_fill() function to create a specified number of arrays with the same value; 2. Use the array_fill_keys() function to create an array with a specified key name. Arrays with the same values; 3. Use the array_pad() function to extend an array to the specified length and fill the new elements with the specified value.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

In PHP development, there are often situations where it is necessary to set values ​​for arrays in batches. For example, during the development process, it is necessary to store multiple pieces of data taken out from the database into an array, or to set values ​​for an array. All elements of are set to the same value. At this point, you can use the method provided by PHP to set array values ​​in batches.

Method 1: Use the array_fill() function

Use the array_fill() function to create a specified number of arrays with the same value.

Syntax:

array array_fill ( int $start_index , int $num , mixed $value )

Parameter description:

start_index: starting index, indicating that the first element in the array will start from this index . num: The number of array elements, indicating the number of elements that need to be created. value: The value to fill the array.

Sample code:

$myArray = array_fill(0, 5, 'hello');
print_r($myArray);

Output result:

Array

(
    [0] => hello
    [1] => hello
    [2] => hello
    [3] => hello
    [4] => hello
)

Method 2: Use array_fill_keys() function

Use the array_fill_keys() function to create an array with the same value for a specified key name.

Syntax:

array array_fill_keys ( array $keys , mixed $value )

Parameter description:

keys: The key name to set the value. value: The value to fill the array.

Sample code:

$keys = array('a', 'b', 'c', 'd', 'e');
$myArray = array_fill_keys($keys, 'hello');
print_r($myArray);

Output result:

Array

(
    [a] => hello
    [b] => hello
    [c] => hello
    [d] => hello
    [e] => hello
)

Method 3: Use array_pad() function

Use the array_pad() function to extend an array to a specified length and fill the new elements with the specified value.

Syntax:

array array_pad ( array $array , int $size , mixed $value )

Parameter description:

array: Array to be expanded. size: extended array length. value: The value to fill the array.

Sample code:

$myArray = array('apple', 'banana', 'orange');
$myArray = array_pad($myArray, 5, 'fruit');
print_r($myArray);

Output result:

Array
(
    [0] => apple
    [1] => banana
    [2] => orange
    [3] => fruit
    [4] => fruit
)

The above is how to set values ​​for arrays in batches in PHP. Since PHP provides simple and easy-to-use array functions, so in In the actual development process, selecting appropriate functions can significantly improve development efficiency and reduce redundant code writing.

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