Friday, 8 December 2017

PHP Web Hosting

Website hosting can is not an easy process. Depending on how much space you need, how much data transfer is required, finding a reliable host, and getting everything online is a tedious task. If it is aimed at a business site, then things become even more complex. A few problems faced in the task of web hosting are mentioned below.

The most basic factors in choosing a web host are disk space and amount of data to be transferred. The plan you require is based on these 2 factors. In general, business websites will require more disk space and data transfer than small non-commercial websites. The presence of the online shopping cart is the reason for this.
The amount of data to be transferred using the shopping cart will depend on how many people use it. So it is better to start small and then upgrade later depending on your requirements.

Most prospective business owners will have an idea of how much sales will happen initially. So the choice of a shopping cart should be personal.

Those entirely new to ecommerce will probably not have any experience with any kind of shopping cart software. Most hosting companies will provide a choice from the popular choices available, from which you can choose. It is important to find a shopping cart that suits the individual user, as attempting to change your shopping halfway down will affect your business as a whole.

Don't immediately jump at the first offer from a web host. Ask if they have demos and try them out. Be sure it's a program which is easy to learn and use, Even if you have a large business and have a web design firm setting up the cart, a basic knowledge of the shopping cart's processes is highly recommended.

Want some discount coupons for a posh dinner, weekend breaks or theatre shows? Checkout a good daily deal website soon! Quite a good number of daily deal websites have started coming up across the internet these days, displaying a variety of daily deals and special offers. Those who are interested in them can start searching some of the biggest and most popular group purchasing platforms or social purchasing websites such as Groupon, LivingSocial and Wahanda, and see what each one is offering. Go through every individual deal carefully and once you’ve decided proceed, join-in and partake by logging in.

Most of the deal websites give prominence to the local businesses, yet you will also have options to search outside of your location. This means you have options to look for quality deals to give as gifts to friends who are staying in other areas, far away from your city.

One of the best aspects of daily deal websites is that a lot of people join together and combine their buying power, to get a particular item in a far cheaper rate than they would normally be offered. This help very individual in the deal, as they can save a huge amount of money from the purchase. A deal website coupon thus makes many things affordable, that wouldn’t otherwise be. Hurry up! Find some good group buying platforms soon and start checking out all the cheap deals that they display!

For the sake of portability, the standard tags (<?php and ?>) are probably the safest choice. Short tags are enabled by default and have the virtue of brevity, but to promote portability, it might be safest to avoid them.
It is true that the PHP is loosely typed, which means it calculates data types as data is assigned to each variable. But, this gives a mixed blessing. On the one hand, it means that variables can be used flexibly, holding a string at one point and an integer at another. On the other hand, this can lead to problems in larger scripts if you expect a variable to hold one data type when, in fact, it holds something completely different. You might have created code designed to work with an array variable, for example. If the variable in question contains a number value instead, errors might occur when the code attempts to perform array-specific operations on the variable.

Often the data type of a variable constrains what you can do with it. You might want to ensure that a variable contains an integer or a double before using it in a mathematical calculation.

A variable named $f is unlikely to mean much to you when you return to your code after a month or so. A variable named $filename, on the other hand, should make more sense.
 By using parentheses in your expressions, you can make your code easy to read at the same time as defining your own order of precedence.

You can also access global variables anywhere in your scripts with a built-in associative array called $GLOBALS. To access a global variable called $test within a function, you could reference it as $GLOBALS['test']

We would usually use print() to write to the browser, although we could use echo() with the same results
Strings in PHP can be enclosed between the double quotation marks (") or single quotation marks ('). Where is the different in it.

There is a difference between double quotation marks and single quotation marks when used with strings.

Double quotation marks allow the parsing of variables. If you include a variable within double quotation marks the PHP engine substitutes the variable's value, like so:

$name = "Jim";
print "hello, $name"; // hello, Jim

If you use single quotation marks to enclose the same string, the variable is not substituted:

print 'hello, $name'; // hello, $name

Double-quoted strings are also parsed for escape characters. Escape characters take on or lose special meaning when preceded by a backslash () character. Notable among these are n for a newline character, t for a tab, " to print a double-quoted character within a double-quoted string, \ to print a backslash, and $ to print a dollar sign (so that it is not mistaken for the start of a variable).

We can change the type of variable with settype(). Then how is it different from casting?

The principle difference between settype() and a cast is the fact that casting produces a copy, leaving the original variable untouched.

It is certainly not a procedure you will use often because PHP automatically casts for you when the context requires. However, an automatic cast is temporary, and you might want to make a variable persistently hold a particular data type.

Numbers typed in to an HTML form by a user are made available to your script as a string when entered in the text box. If you try to add two strings containing numbers, PHP helpfully converts the strings into numbers while the addition is taking place. So

"30cm" + "40cm"

produces the integer 70.
In casting the strings, PHP ignores the non-numeric characters. However, you might want to clean up your user input yourself. Imagine that a user has been asked to submit a number. We can simulate this by declaring a variable and assigning to it, like so:

$test = "30cm";

As you can see, the user has mistakenly added units to the number. We can ensure that the user input is clean by casting it to an integer, as shown here:

$test = (integer)$test;
print "Your imaginary box has a width of $test centimeters";

As a rule of thumb, if you want a string to be output exactly as you typed it, you can use single quotation marks. This can help your code to run more quickly because the interpreter does not have to parse the string. If you want to take advantage of escape characters such as n and use variable substitution, you should use double quotation marks.

Apart from the getype() function in PHP, is there any more function, which can also return the variable type.

gettype() is a specialized tool. It does what it promises and returns a variable's type.
var_dump() also tells you a variable's type with that it also tells you contents it is holding. More than that, for complex types such as arrays and objects, var_dump() provides information about all the types contained within the variable, as well as about the variable itself.

$test = 5;
var_dump( $test );

This fragment gives us the following result:


This tells us that the variable $test contains an integer and that the value of that integer is 5.

With var_dump() we did not need print to print the the result because the function prints its findings directly to the browser or command line.

but, with the gettype(), we do need to use the print statement:
print gettype(test);

Can we make it case-insensitive, as sometimes user types, JIM, jim, Jim, so it gives an error message, as the user does not match.

Well, define() optionally accepts a third boolean argument that determines whether the constant name should be case insensitive. By default, constants are case sensitive, but by passing true to the define() function you can change this behavior. So, if we were to set up our USER constant in this way

Define ("USER", "JIM", true);

we could access its value without worrying about case. So

print User;
print usEr;
print USER;

would all be equivalent.

Do not use word processors that format text for printing (such as Word or OpenOffice). Even if you save files created using this type of editor in plain text format, hidden characters can creep into your code.

PHP Comments
Some short scripts will be self-explanatory to you, even after a long interval. For scripts of any length or complexity, you should comment your code. This will save you time and frustration in the long run

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