An example of PHP strpos with user entered search term

PHP Code

Output

$search_term=$_POST["searchterm"];
$source_string = 'In this demo, I am using a user entered search term to check if string contains search term or not by using strpos!';
//   = 'strpos';
$posistion = strpos($source_string, $search_term);
if( $search_term ){
    echo "<div class='result'>";
    if ($posistion === false) {
        echo "The source string does not contain the: '$search_term'!";
    } else {
        echo "The string contains the search term: '$search_term'! </BR>";
        echo " The given substring found at: $posistion";
    }
    echo "</div>";
}

The Mark up

<!doctype html>
<html>
<head>

<style>
.result {
  background: #5BB75B;
  height: auto;
  width:220px;
  border-radius: 15px;
  padding:20px;
  font-size:20px;
  color:#000;   
}
.searchterm{
  background: #6A0432;
  width:220px;
  border-radius: 15px;
  padding:20px;
  font-size:18px;
  color:#fff;   
}
</style>
</head>
<div class="searchterm">

<form method="post" action="">
<label>Enter a string:</label><input type="text" name="searchterm">
<input type="submit"/>
</form>
</div>
</body>
</html>