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This is the second part of the Common PHP Programing Mistakes discussed in the previous section.
Namespaces and Variable Types Error
Unlike other programming languages, PHP is not too strict about the namespaces and variable types. This is the reason why this programming language is chosen by a large number of non-programmers. Data of any length or type can be assigned or reassigned to a given variable in PHP programming language, whereas in the case of other programming languages, variable should include a specific size and type. This is certainly one of the major advantages of PHP programming language. However, when web programmers are developing a large web application, there is a greater chance of a possible collision between variable names. This lead to a complex situation where programmers may find it extremely difficult to pinpoint the source of the error. Now if we take an imaginary application that comprises three includes (which are mentioned below), it will help us to comprehend impact of this error:
include('example_one.php');
include('example_two.php');
include('example_three.php');
These three includes will run as respectively: “$name=’My Web Application’;”, if($show_name==true){ $name=’John Doe’; } and print $name;. Ultimately the result will be shown as “My Web Application”. But if anyone adds some code to example_one.php without giving much care to the if statement of the example_two.php, it is bound to generate an error. In this case, the possible result will be a person’s name as oppose to an application name. This is a common error for programmer because they usually add a number of variable names such as $count, $x, $temp which are generally overlooked by a large section of them.
Now the one and only solution to this complicated problem is to scope the unscoped variable or referring scoped variable within the scope. A programmer can evade this error by specifying the code in clearly and precisely. The possibility of variable name collisions can be reduced by it. For example, if a programmer refer the variables POST and GET as $_POST['address'] or $_GET['address'], it will definitely reduce the possibility of variable name collisions.
Comparison != Assignment
Equal sign is a confusing operator because it is used for both assignment and comparison. Therefore, a web developer needs to use this operator very carefully otherwise; a serious error could pop up all of a sudden. If you find any logical error in your programming code, you should check the comparison statement at first.
In conclusion, all we can say is that these mistakes are pretty common if your are a beginner. However, we should try our level best to evade these common mistakes because they unnecessarily elongate a project and even sometimes makes it difficult for a seasoned professional to pinpoint those trivial mistakes. So, it is better for us to remain alert of them.
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[...] other common PHP mistakes will be published in the next section of this [...]