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PHP4 Practical Application Experience article 2

Source: Internet
Author: User
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The other half-the "login. php" script file is opened. If not, the script will accept the input name, check whether the user exists, and decide whether to allow or deny access to the site. Since you have not learned the conditional statements and logic processing of PHP, we are not going to explain it to you now-on the contrary, we only show you how the data submitted in the preceding form is transferred to "login. php ", and can be used by this file.
This is "login. php"
--------------------------------------------------------------------------------
<Html>
<Head>
<Basefont face = "">
</Head>
<Body>
<Center>
<Font face = "" size = "-1">
I want to know if you have heard of Shakespeare, <? Echo $ name;?>.
<P>
He asked for a bunch of roses named by another name, because the bouquet may smell more fragrant.
<P>
What do you think?
</Font>
</Center>
</Body>
</Html>
--------------------------------------------------------------------------------
When you input data in the form, for example ("Zhang San") and submit the data, you will see the following page:
--------------------------------------------------------------------------------
I want to know if you have heard of Shakespeare, James.
He asked for a bunch of roses named by another name, which could smell more fragrant.
What do you think?
--------------------------------------------------------------------------------

You will see that whenever a form is submitted to a PHP script, the variable values and form names in all forms are transmitted to the script in pairs, this can be called by the script at will. In the preceding example, when the form is submitted, the variable $ name is automatically created in the script "login. php" and the value entered by the user in the form is also assigned to the variable.
If you use Perl to do the same thing, you need to clearly write the Perl code to get the variable values in the form. By automatically creating and assigning values, PHP simplifies your code and greatly improves development speed-form processing is one of the two reasons why PHP is better than Perl.
Obviously, PHP also supports the form submission post method. All you need to do is to mark the METHOD value as "POST ".
Of course, the example you just saw is very basic. For a really heavyweight program, you need to know how to organize conditional statements. A very basic condition statement is a comparison statement-for example, "If a condition is equal to a condition, use a certain method to perform this action"
PHP has a specially designed operator to facilitate use in conditional statements. Here is a list:
Assume that $ delta = 12 and $ omega = 9
Operator
Meaning
Expression
Result
=
Equal
$ Delta = $ omega
False
! =
Not equal
$ Delta! = $ Omega
True
>
Greater
$ Delta> $ omega
True
<
Less
$ Delta <$ omega
False
> =
Greater than or equal
$ Delta> = $ omega
True
<=
Less than or equal
$ Delta <= $ omega
False
PHP4 also adds a new operator "=" to test whether the two data values and types are the same. There is a simple example in the last section of this section.

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