Introduction to PHP Tutorial-first lesson

/*
1. Embedding Method:
Similar to the ASP <%,php can be <?php or yes, the end symbol is, of course, you can also specify.

2. Reference documents:
There are two ways to refer to a file: Require and include.
Require use methods such as: Require ("myrequirefile.php");
This function is usually placed at the top of the PHP program, PHP program before executing, will first read into the require designated to introduce the file, so that it becomes part of the PHP Program Web page. A commonly used function can be introduced into a Web page in this way.
Include use methods such as: Include ("myincludefile.php");
This function is typically placed in the processing section of the Process Control. The PHP Program page reads the included file when it is read. This way, you can simplify the process of executing a program.

echo "This is the first example. " ; This example is a comment for C + + syntax
This example uses multiple lines of
Annotation Way
echo "This is the second example. " ;
echo "This is the third example. " ; # This example uses the Unix shell syntax annotation
4. Variable type:

The code is as follows	Copy Code
$mystring = "I am a string"; $NewLine = "line Change"; $int 1 = 38; $float 1 = 1.732; $float 2 = 1.4E+2;

$MyArray 1 = Array ("Zi", "ugly", "Yin", "Mao");
This leads to two questions: first PHP variables begin with $, and the second PHP statement ends with a possible ASP programmer that doesn't fit. These two omissions are also the most error in the procedure.

5. Operation Symbol:

Mathematical operations:
Symbolic meaning
+ addition operation
-Subtraction operation
* Multiplication operation
/Division Operations
% take remainder
+ + Additive
--Diminishing

String Operations:
There is only one operation symbol, the period of English. It can concatenate strings into a new merged string. Similar to & in ASP

?
$a = "PHP 4";
$b = "strong function";
echo $a. $b;
?>

Here also leads to two problems, first PHP output statement is echo, the second similar to the <%= variable%>,php in ASP can also <?= variable?>.

Logical operations:
Symbolic meaning
< less than
> Greater than
<= less than or equal to
>= is greater than or equal to
= = equals
!= is not equal to
&& (and)
And and (and)
|| or (OR)
or or (or)
XOR exclusive OR (XOR)
! No (not)