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PHP

Programming PHP: A Beginner`s Guide
By: James Payne
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    2007-10-29


    Table of Contents:
  • Programming PHP: A Beginner`s Guide
  • PHP Means PHP: Hypertext Preprocessor
  • Variables
  • Working with Strings

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    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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