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<?php
$str = "Hello World!";
echo $str . PHP_EOL;
echo trim($str, "Hed!");
?>

<?php
$str = " Hello World! ";
echo "Without trim: " . $str;
echo "<br>";
echo "With trim: " . trim($str);
?>

<!DOCTYPE html>
<html>
<body>

Without trim: Hello World! <br>With trim: Hello World!
</body>
</html>

Without trim: Hello World!
With trim: Hello World!

<?php
$str = "nnnHello World!nnn";
echo "Without trim: " . $str;
echo "<br>";
echo "With trim: " . trim($str);
?>

<!DOCTYPE html>
<html>
<body>

Without trim:


Hello World!


<br>With trim: Hello World!
</body>
</html>

Without trim: Hello World!
With trim: Hello World!