Online PHP editor | output for O1kBl

<?php function getReplacedStr($str, $searchStr, $replaceWith){ $arr = explode(' ', $str); $firstElement = array_shift($arr); if($searchStr == $firstElement){ $finalStr = $replaceWith.' '.implode(' ', $arr); }else{ $finalStr = $str; } return $finalStr; } $replaceWith = 'Hi'; $searchStr = 'Hello'; $str = 'Hello World Hello World'; $str2 = 'Super World Hello World'; echo getReplacedStr($str, $searchStr, $replaceWith); echo "\n"; echo getReplacedStr($str2, $searchStr, $replaceWith);