W3School TIY Editor
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<!DOCTYPE html> <html> <body> <?php function sum($x,$y) { $z=$x+$y; return $z; } echo "5 + 10 = " . sum(5,10) . "<br>"; echo "7 + 13 = " . sum(7,13) . "<br>"; echo "2 + 4 = " . sum(2,4); ?> </body> </html>