PHP implode() Function

The implode() is a built-in 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 join array elements with a string. Just like join() function , implode() function also returns a string formed from the elements of an array.

Syntax:

string implode(separator,array)

Parameters: The implode() function accepts two parameters out of which one is optional and one is mandatory.

1. separator: This is an optional parameter and is of string type. The values of the array will be join to form a string and will be separated by the separator parameter provided here. This is optional, if not provided the default is " "(i.e. an empty string).
2. array: The array whose value is to be joined to form a string.

Note: The separator parameter of implode() is optional. However, it is recommended to always use two parameters for backwards compatibility.

Return Type: The return type of implode() function is string. It will return the joined string formed from the elements of the array.

Examples:

Input : implode(array('Geeks','for','Geeks')
Output : GeeksforGeeks

Input : implode("-",array('Geeks','for','Geeks')
Output : Geeks-for-Geeks

Examples of PHP implode() Function

Below program illustrates the working of implode() function in PHP:

Example 1: Using implode() Without a Separator

In this example, the implode() function is used to join the elements of an array into a single string without specifying any separator. Since no separator is provided, the elements will be joined directly, one after the other.

<?php
$array = array('Geeks', 'for', 'Geeks');
echo implode($array);
?>

GeeksforGeeks

Example 2: Using implode() with a Specified Separator

In this example, the implode() function is used to join the elements of an array into a single string with a specified separator. Here, the separator is "-", so the elements will be joined with dashes between them.

<?php
$array = array('Geeks', 'for', 'Geeks');
echo implode("-", $array);
?>

Geeks-for-Geeks