Using PHP implode() to Convert an Array into a String

The article introduces the implode() function in PHP, which converts the values of a one‑dimensional array into a single string by concatenating them with an optional separator.

Function signatures:

string implode(string $glue, array $pieces)

string implode(array $pieces)

Parameters

glue : The string used to separate the array elements; defaults to an empty string.

pieces : The array whose values you want to join.

Return value

A string containing the array elements joined by the glue string. If the array is empty, an empty string is returned.

Example

<?php
$array = array('lastname', 'email', 'phone');
$comma_separated = implode(",", $array);
echo $comma_separated; // outputs: lastname,email,phone

// Empty string when using an empty array:
var_dump(implode(",", array())); // string(0) ""
?>

The example demonstrates joining an array of strings with a comma separator and shows that calling implode() on an empty array yields an empty string.