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<!DOCTYPE html> <html> <body> <?php echo "0: " .(boolval(0) ? 'true' : 'false') . "<br>"; echo "4: " .(boolval(42) ? 'true' : 'false') . "<br>"; echo '"": ' .(boolval("") ? 'true' : 'false') . "<br>"; echo '"Hello": ' .(boolval("Hello") ? 'true' : 'false') . "<br>"; echo '"0": ' .(boolval("0") ? 'true' : 'false') . "<br>"; echo "[3, 5]: " .(boolval([3, 5]) ? 'true' : 'false') . "<br>"; echo "[]: " .(boolval([]) ? 'true' : 'false') . "<br>"; ?> </body> </html>