# PHP program to print an arithmetic progression series using inbuilt functions

We have to print an arithmetic progressive series in PHP, between two given numbers a and b both including, a given common arithmetic difference of d

Examples:

```Input : \$a = 200, \$b = 250, \$d = 10
Output : 200, 210, 220, 230, 240, 250

Input : \$a = 10, \$b = 100, \$d = 20
Output : 10, 30, 50, 70, 90```

This problem can be solved using loops by iterating from \$a to \$b and incrementing the loop variable by \$d. But in PHP we can also make use of some inbuilt functions to solve this particular problem. We will have to use the below two functions for this purpose:

• range() function: This function is used to create an array of elements of any kind such as integers, or alphabets within a given range(from low to high) i.e, list’s first element is considered as low and the last one is considered as high.
• implode() function: If we have an array of elements, we can use the implode() function to join them all to form one string. We basically join array elements with a string.

The idea to solve this problem using the above two inbuilt functions is to first use the range() function to generate an array of values between \$a and \$b where the values are incremented by \$d. After generating the array we will use the implode() function to create a string from the array where elements will be separated by a comma(,) separator.

## PHP

 ``

Output:

`1, 16, 31, 46, 61, 76, 91`

Time complexity: O(n) // To print series up to nth tern

Auxiliary Space: O(1)

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