Learning PHP Variable
Variable are used as the storage file for understanding it
easily we can compare variable with container box. You can name the box and can
save specific data in each box. For example you have a box name clothes you can
fill the box with garments jeans etc. Similarly when you create a variable you
can give it a name and store some value in it.
Variables start with $ symbol
PHP Variable naming rules
·
Variable names must start with a letter of the
alphabet or the _(underscore) character.
·
Variables names can contain only the characters:
a-z,A-Z,0-9, and _(underscore).
·
Variable names may not contain spaces. Instead
of spaces you can use underscore (eg. $my_name).
·
Variable names are case sensitive. $My_name is
not same sa variable $my_name.
Example of string variable
<?php
$filename= “learning php”;
echo $filename;
echo “<br/>”;
$current_file = $filename;
echo $current_file;
?>
Example of Numeric Variables
$counter =25;
You can use floating point number with same syntax;
$counter =25.6;
Arrays
Before discussing about variable in arrays I will explain
about array. We can understand about array as the boxes attached together in a
queue. With the help of array you can call out the attached boxes information
individually by calling its number.
Let’s take an example of a group of seo experts. We will put
them in an array.
Example of array variable
<?php
$seoexperts = array(‘Rahul Rana’,
‘temp1’,’temp2’,’temp3’,’temp4’);
echo $seoexperts[3]; //displays output temp3
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