By Welling L., Thomson L.

ISBN-10: 0672322404

ISBN-13: 9780672322402

ISBN-10: 0672322579

ISBN-13: 9780672322570

ISBN-10: 0672322609

ISBN-13: 9780672322600

ISBN-10: 0672323257

ISBN-13: 9780672323256

An intermediate to complicated consultant to personal home page and MySQL, the loose, open-sourced net improvement items. deals insurance of object-oriented internet programming, developing companies utilizing SSL and authentication, and different functions

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You can also use the subtraction symbol, -, as a unary operator (that is, an operator that takes one argument or operand) to indicate negative numbers; for example: $a = -1; Multiplication and division also work much as you would expect. Note the use of the asterisk as the multiplication operator, rather than the regular multiplication symbol, and the forward slash as the division operator, rather than the regular division symbol. The modulus operator returns the remainder of dividing the $a variable by the $b variable.

Similarly, $totalamount is now of type double. Strangely enough, we could now add a line to our script as follows: $totalamount = 'Hello'; 25 03 525x ch01 26 1/24/03 3:40 PM Page 26 Chapter 1 PHP Crash Course The variable $totalamount would then be of type string. PHP changes the variable type according to what is stored in it at any given time. This ability to change types transparently on-the-fly can be extremely useful. Remember PHP “automagically” knows what data type you put into your variable.

The following line of code will create a new variable named $tireqty and copy the contents of $HTTP_POST_VARS['tireqty'] into the new variable: $tireqty = $HTTP_POST_VARS['tireqty']; Place the following block of code at the start of the processing script. All other scripts in this book that handle data from a form will contain a similar block at the start. We are generally placing this block at the very start of the script to make it easy to find. > This code is creating three new variables, $tireqty, $oilqty, and $sparkqty, and setting them to contain the data that was sent via the POST method from the form.

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PHP and MySQL Web Development by Welling L., Thomson L.


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