161⟩ Can you extend a Final defined class?
No, you cannot extend a Final defined class. A Final class or method declaration prevents child class or method overriding.
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202 Senior PHP Programmer Questions And Answers
162⟩ What are Traits?
Traits are a mechanism that allows you to create reusable code in languages like PHP where multiple inheritance is not supported. A Trait cannot be instantiated on its own.
It's important that a developer know the powerful features of the language (s)he is working on, and Trait is one of such features.
163⟩ In a PHP class what are the three visibility keywords of a property or method?
public, private and protected. The default is public.
Public -> Any class may instantiate the class and call the method or property.
Protected -> Only the class itself or inherited (children) classes may call a method or property.
Private -> Only the class itself may call a method or property.
164⟩ How can you sort an array?
sort() − Sorts an array.
165⟩ How will you destroy the session?
A PHP session can be destroyed by session_destroy() function.
166⟩ How will you set cookies using PHP?
PHP provided setcookie() function to set a cookie. This function requires upto six arguments and should be called before <html> tag. For each cookie this function has to be called separately.
setcookie(name, value, expire, path, domain, security);
167⟩ How will you include the content of a PHP file into another PHP file?
There are two PHP functions which can be used to included one PHP file into another PHP file.
☛ The include() Function
☛ The require() Function
168⟩ How will you access the error code associated with file upload in PHP?
Using $_FILES['file']['error'] − it provides the error code associated with this file upload.
169⟩ Explain the importance of the function htmlentities?
The htmlentities() function converts characters to HTML entities.
170⟩ Explain the syntax for 'foreach' loop in PHP?
The foreach statement is used to loop through arrays. For each pass the value of the current array element is assigned to $value and the array pointer is moved by one and in the next pass next element will be processed.
foreach (array as value)
{
code to be executed;
}
171⟩ How will you make a check that a cookie is set or not?
You can use isset() function to check if a cookie is set or not.
172⟩ Why would you use === instead of ==?
If you would want to check for a certain type, like an integer or boolean, the === will do that exactly like one would expect from a strongly typed language, while == would convert the data temporarily and try to match both operand's types. The identity operator (===) also performs better as a result of not having to deal with type conversion. Especially when checking variables for true/false you want to avoid using == as this would also take into account 0/1 or other similar representation.
173⟩ How will you access the actual name of the uploaded file in PHP?
Using $_FILES['file']['name'] − it provides the actual name of the uploaded file.
174⟩ Tell me In how many ways you can embed PHP code in an HTML page?
All PHP code must be included inside one of the three special markup tags ate are recognized by the PHP Parser.
<?php PHP code goes here ?>
<? PHP code goes here ?>
<script language="php"> PHP code goes here </script>
Most common tag is the <?php...?>
175⟩ How will you get environment variables in PHP?
PHP provides a function getenv() to access the value of all the environment variables.
176⟩ What is the purpose of $_SESSION variable in PHP?
$_SESSION − An associative array containing session variables available to the current script.
177⟩ How will you access the size of the uploaded file in PHP?
Using $_FILES['file']['size'] − it provides the size in bytes of the uploaded file.
178⟩ How will you get information sent via post method in PHP?
The PHP provides $_POST associative array to access all the sent information using POST method.
179⟩ How will you get cookies using PHP?
PHP provides many ways to access cookies. Simplest way is to use either $_COOKIE or $HTTP_COOKIE_VARS variables.
180⟩ How will you get information sent via get method in PHP?
The PHP provides $_GET associative array to access all the sent information using GET method.
