How to convert numeric value into array in php

In PHP development, sometimes we need to convert values ​​into arrays to perform some operations or facilitate data processing. This article will introduce how to convert numerical types into arrays in PHP.

1. Use the str_split function

The str_split function in php can convert a string into a character array. This function can help us convert a numerical string into an array. function. The sample code is as follows:

$num = 123456;
$numArray = str_split($num);
print_r($numArray);

After running the code, the output result is:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
)

2. Use preg_split function

Sometimes we need to convert a numerical string according to Splits the specified length into multiple strings and places the strings in an array. PHP's preg_split function can achieve this function through regular expressions. The sample code is as follows:

$num = "1234567890";
$numArray = preg_split("/(?<=\d{3})(?!$)/", $num, -1, PREG_SPLIT_NO_EMPTY); 
print_r($numArray);

The output result is as follows:

Array
(
    [0] => 123
    [1] => 456
    [2] => 789
    [3] => 0
)

3. Using array functions

In PHP, we can also use array functions to quickly convert values Convert to array. Through the range and array_map functions, we can generate an array from 1 to a specified value. For example, the method to convert 10 into an array is as follows:

$num = 10;
$numArray = array_map(function ($n) { return $n; }, range(1, $num));
print_r($numArray);

The output result is as follows:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
    [9] => 10
)

4. Use a for loop

The simplest method is of course through A for loop adds values ​​to the array one by one. For example, the method of converting 10 into an array is as follows:

$num = 10;
$numArray = [];
for ($i = 1; $i <= $num; $i++) {
  array_push($numArray, $i);
}
print_r($numArray);

The output result is as follows:

Array
(
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
    [5] => 6
    [6] => 7
    [7] => 8
    [8] => 9
    [9] => 10
)

The above are several methods of converting values ​​into arrays in PHP. Developers can choose the appropriate one according to specific needs. method to convert numeric types to arrays.

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