อยากได้ Code Search เหมือน google เวลาเจอจะขึ้นตัวสีแดง

<?php

$data1 = 'test db php xyz number 1 desktop';
$data2 = 'abnormal mk msoffice search code';
//แบบปกติ
//echo $data1.'<br>';
//echo $data2.'<br>';

//แบบ hilight
$_POST['search_text'] = "code search php";
$search = $_POST['search_text'];// "code search php"
$search = preg_split('/\s+/',$search);
$replace = array_map(function($val){return '<span style="color:red">'.$val.'</span>';},$search);
echo str_replace($search,$replace,$data1),'<br>';
echo str_replace($search,$replace,$data2),'<br>';