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<form action=" " method="GET">
  <input type="text" name="text" value="">
  <input type="submit">
</form>

<?php
  if (isset($_GET['text'])) {
    $text = $_GET['text'];
  }
  else{
    $text = "";
  }

  $words = [
    'apple',
    'work',
    'tree',
    'flover',
    'green',
    'strong'
  ];

  $strlen = strlen($text);

  for ($i=0; $i < $strlen; $i++) {
    foreach ($words as $word) {
      if (stripos($word, $text[$i])) {
        echo $word . " - <b>[$text[$i]]</b>" . "<br>";
      }
    }
  }