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<!DOCTYPE html> <html> <body> <?php // Positive numbers: 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 "<br>"; // Negative numbers: echo substr("Hello world",-1)."<br>"; echo substr("Hello world",-10)."<br>"; echo substr("Hello world",-8)."<br>"; echo substr("Hello world",-4)."<br>"; ?> </body> </html>
d
ello world
lo world
orld
d
ello world
lo world
orld
