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PHP for the Web: Visual QuickStart Guide: Using Numbers

Apr 7, 2011

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This chapter is from the book 

PHP for the Web: Visual QuickStart Guide, 4th Edition

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Review and Pursue

If you have any problems with the review questions or the pursue prompts, turn to the book’s supporting forum (www.LarryUllman.com/forum/).

Review

What are the four primary arithmetic operators?
Why will the following code not work:
```
print "The total is $$total";
```
What must be done instead?
Why must an HTML page that contains a form that’s being submitted to a PHP script be loaded through a URL?
What functions can be used to format numerical values? How do you format numbers to a specific number of decimals?
What is the importance of operator precedence?
What are the incremental and decremental operators?
What are the arithmetic assignment operators?

Pursue

Look up the PHP manual page for one of the new functions mentioned in this chapter. Use the links on that page to investigate a couple of other number-related functions PHP has.
Create another HTML form for taking numeric values. Then create the PHP script that receives the form data, performs some calculations, formats the values, and prints the results.

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