How to fill array with given values ​​in PHP

This article mainly introduces how to use the array_pad() function in PHP to fill an array with a given value.

The syntax is as follows:

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

• array represents an array.

• size represents the number of array elements returned from the function.

• value represents the value of the new element in the array returned from the function.

Return value: Returns the filled array. The returned array is just a copy, the original array will not be changed.

Example:

?php
$a=array("red","green");
echo "<pre class="brush:php;toolbar:false">";
var_dump(array_pad($a,-5,"blue"));
?>

Compilation display:

array(5) {
  [0]=>
  string(4) "blue"
  [1]=>
  string(4) "blue"
  [2]=>
  string(4) "blue"
  [3]=>
  string(3) "red"
  [4]=>
  string(5) "green"
}

PS: The value of size is int Type

• If size is a positive number, fill it to the right side of the array;

<?php
$input = array(12, 10, 9);

$result = array_pad($input, 5, 0);
var_dump($result1);
//输出(12, 10, 9, 0, 0)

?>

• If size is a negative number, fill it from the left;

<?php
$input = array(12, 10, 9);

$result = array_pad($input, -7, -1);
var_dump($result2);
// 输出(-1, -1, -1, -1, 12, 10, 9)

?>

• If the absolute value of size is less than or equal to the length of the arr array, there will be no Any padding.

<?php
$input = array(12, 10, 9);
$result = array_pad($input, 2, "noop");
var_dump($result2);
// 输出(12, 10, 9)
?>

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