Edit the following code to specify that $total is a floating point number with two decimal places after the decimal point.

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printf $("$Total amount of order is $\text{'},,$ $total$)$;

Convert the $subject string to lowercase.

Edit the following PHP code to split the customer's e$-$mail address into two parts.

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$email$\_$array $=$ explode$(\text{'}$@$\text{'},$ $email$)$;

Edit the following PHP code to echo the value $4$ to the browser.

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$test $=$ "Hello world";

echo strpos$($$test, $\text{'}")$;

Just $1-4$ questions in PHP$.$