Programming PHP: A Beginner`s Guide - Working with Strings (
Page 4 of 4 )
Now that we know how to print a string and create variables to hold strings, let's look at some ways to manipulate strings.
<html>
<body>
<?php
$first_name = "James";
$last_name = "Payne";
echo $first_name . " " . $last_name; concatenation
?>
</body>
</html>
The above code is called concatenation and is used to join two things together (in this case, two words). The above code prints out the text:
James Payne
You will note the " " places a space between the words.
There are a ton of functions that let you goof around with strings in PHP, and I will write a tutorial on them in the near future.
In addition to toying with strings, you can also manipulate numeric data as well. To do this we use operators. Below is a giant list of the different operators available to you in PHP.
|
Symbol |
What it Does |
Type |
|
+ |
Used for Addition |
Arithmetic |
|
- |
Used for Subtraction |
Arithmetic |
|
* |
Used for Multiplication |
Arithmetic |
|
/ |
Used for Dividing |
Arithmetic |
|
% |
Used for Modulation |
Arithmetic |
|
++ |
Used to increase value by one |
Arithmetic |
|
-- |
Used to decrease value by one |
Arithmetic |
|
"=" |
Used to Assign a Value |
Comparison |
|
+= |
Used to Add and Assign a Value |
Comparison |
|
-= |
Used to Subtract and Assign a Value |
Comparison |
|
*= |
Used to Multiply and Assign a Value |
Comparison |
|
/= |
Used to Divide and Assign a Value |
Comparison |
|
.= |
Decimals and Adds a Value |
Comparison |
|
%= |
Used to Modulate and Add a Value |
Comparison |
|
"==" |
Equal To |
Comparison |
|
!= |
Not Equal To |
Comparison |
|
> |
Greater Than |
Comparison |
|
< |
Less Than |
Comparison |
|
>= |
Greater Than or Equal To |
Comparison |
|
<= |
Less Than or Equal To |
Comparison |
|
&& |
Checks for more than one criteria |
Logical |
|
|| |
Checks to see if at least one of a set of criteria is true |
Logical |
|
! |
Checks to see if a criteria is not true |
Logical |
Well that's all the time we have for this tutorial. In our next episode, we will discuss how to use the various operators to further manipulate our data. If we have time we discuss Conditional Statements as well.
Till then...
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