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<?php
echo substr("Hello world", 6);
?>

<?php
echo substr("Hello world", 10) . "<br>";
echo substr("Hello world", 1) . "<br>";
echo substr("Hello world", 3) . "<br>";
echo substr("Hello world", 7) . "<br>";

echo substr("Hello world", -1) . "<br>";
echo substr("Hello world", -10) . "<br>";
echo substr("Hello world", -8) . "<br>";
echo substr("Hello world", -4) . "<br>";
?>

<?php
echo substr("Hello world", 0, 10) . "<br>";
echo substr("Hello world", 1, 8) . "<br>";
echo substr("Hello world", 0, 5) . "<br>";
echo substr("Hello world", 6, 6) . "<br>";

echo substr("Hello world", 0, -1) . "<br>";
echo substr("Hello world", -10, -2) . "<br>";
echo substr("Hello world", 0, -6) . "<br>";
echo substr("Hello world", -2, -3) . "<br>";
?>