what is the implode in PHP code example

Example 1: implode php

$array = array('banana', 'strawberry', 'apple');
comma_separated  = implode(",", $array);
echo comma_separated; // banana,strawberry,apple

Example 2: php implode

$arr = array('Hello','World!','Beautiful','Day!');
echo implode(" ",$arr);
// Outputs: 'Hello World! Beautiful Day!'