The comma separated list can be created by using implode() function. The implode() is a builtin function in PHP and is used to join the elements of an array. implode() is an alias for PHP | join() function and works exactly same as that of join() 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. Just like join() function , implode() function also returns a string formed from the elements of an array.
string implode( separator, array )
Return Type: The return type of implode() function is string. It will return the joined string formed from the elements of array.
Example 1: This example adds comma separator to the array elements.
Array (  => GFG1  => GFG2  => GFG3 ) GFG1, GFG2, GFG3
Array (  => 0  => 1  => 2  => 3  => 4  => 5  => 6  => 7 ) 0, 1, 2, 3, 4, 5, 6, 7