function highlighter_text($text, $words)  {      $split_words = explode( " " , $words );      foreach($split_words as $word)      {          $color = "#4285F4";          $text = preg_replace("|($word)|Ui" ,              "<span style=\"color:".$color.";\"><b>$1</b></span>" , $text );      }      return $text;  }

<?php  $string = "I like chocolates and I like apples";  $words = "apple";  echo highlighter_text($string ,$words);  ?>