How to convert numbers into array in php

In PHP development, we often need to convert numbers into arrays. This requirement may appear in a variety of scenarios, such as splitting a string of numbers into multiple arrays according to a certain rule, or forming a string of numbers into an array in a specific order. This article will share three common methods of converting numbers into arrays.

1. Use the array function explode()

PHP provides the explode() function, which can split a string into an array according to the specified delimiter. We can first convert the number into a string, and then split it using the explode() function to obtain an array of numbers. The following is a sample code:

$num = 12345;
$str = (string) $num; // 将数字转成字符串
$arr = explode('', $str); // 以空格为分隔符将字符串分割成数组
print_r($arr);

The result of the above code is:

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

It should be noted that since there is no space separator in the numeric string, the explode() function is used When splitting, you need to set the delimiter parameter to the empty string ''.

2. Using the str_split() function of strings

Another common way to convert numbers into arrays is to use the str_split() function. This function can intercept a string every few characters according to the specified length to form an array. Therefore, we can convert the number into a string and then use the str_split() function to split it into an array of individual numbers. The following is a sample code:

$num = 12345;
$str = (string) $num; // 将数字转成字符串
$arr = str_split($str); // 将字符串分割成单个数字组成的数组
print_r($arr);

The result of the above code is the same as the previous result:

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

3. Use mathematical operations to get the number on each digit

Finally One way to convert a number into an array is to use mathematical operations. We can use the modulo operator (%) and the integer division operator (/) in PHP to operate on numbers to get each digit of the number. Specifically, we can use a loop to perform both operations multiple times until the number is split into individual numbers. The following is a sample code:

$num = 12345;
$temp = $num;
$arr = array();
while ($temp > 0) {
    $arr[] = $temp % 10; // 取模运算获得最后一位数
    $temp = (int)($temp / 10); // 整除运算获得剩余位数
}
$arr = array_reverse($arr);
print_r($arr);

The result of the above code is the same as the previous result:

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

One thing to note is that when using loops to perform modulo and integer division operations on numbers, you need to Add the numbers obtained by the operation to the array and reverse the array back to get the correct result.

Summary

In PHP development, converting numbers into arrays is a very common operation. The above article introduces three commonly used methods of converting numbers to arrays, namely using the explode() function, using the str_split() function, and using mathematical operations. Readers can choose different methods to complete the conversion according to their own needs.

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