implode and explode function in php

<?php
// explode function in php  ( string into array )
$str "rajeev-dhar-dwivedi";
$exarr explode("-",$str);

print_r($exarr); // output : Array ( [0] => rajeev [1] => dhar [2] => dwivedi )
?>

<?php
// Implode function in php  ( array into string )

$arr = array('rajeev' 'dhar' ,'dwivedi');
$impstr implode("-",$arr);

echo $impstr // output :  rajeev-dhar-dwivedi
?>

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