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<!DOCTYPE html>
<html>
<body>
​
<?php
// Positive numbers:
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 "<br>";
​
// Negative numbers:
echo substr("Hello world",0,-1)."<br>";
echo substr("Hello world",-10,-2)."<br>";
echo substr("Hello world",0,-6)."<br>";
?>
​
</body>
</html>
​
Hello worl
ello wor
Hello
world

Hello worl
ello wor
Hello