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PHP · Question Set
PHP Basics & Syntax interview questions for placements and exams.
Questions
14
Included in this set
Subject
PHP
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Difficulty
Mixed
Level of this set
Go through each question and its explanation. Use this set as a focused practice pack for PHP.
Both are used to output data. Echo can take multiple parameters and is slightly faster. Print can take only one argument and always returns one, so it can be used in expressions.
echo 'Hi'; print 'Hello';
For complete preparation, combine this set with full subject-wise practice for PHP. You can also explore other subjects and sets from the links below.
PHP has four main scopes: local, global, static, and parameter. Local variables exist inside functions. Global variables are declared outside functions and accessed with the global keyword. Static variables keep their value between function calls. Parameters are variables passed to functions.
You can cast a string to an integer using (int) or the intval() function. Example: intval('25') returns 25. Type casting helps in performing numeric operations safely.
$num = (int)'25';
PHP is an interpreted language. The server reads PHP files, processes the code through the PHP interpreter, and sends the resulting HTML to the client browser. This means users never see the actual PHP code.
PHP originally stood for Personal Home Page, but now it means PHP Hypertext Preprocessor. It is a recursive acronym and used mainly for server-side scripting.
In PHP, all variables begin with a dollar sign. For example, $name equals 'John'.
$name = 'John';
PHP allows single-line comments using double slashes or a hash. Multiline comments use slash star and star slash.
// comment or # comment
The echo statement outputs text or variables. It is faster than print and can take multiple arguments.
echo 'Hello World';
PHP does not have a specific 'character' type. A single character is treated as a string of length one.
PHP variable names are case-sensitive. $Name and $name are different variables. However, function names are not case-sensitive.
define() is used to create a constant that cannot be changed once declared. Example: define('PI', 3.14).
define('PI', 3.14);The dot operator in PHP is used for string concatenation, not addition. 10 dot 5 results in '105'.
$result = 10 . 5; // gives 105
PHP superglobals are built-in variables accessible anywhere. Examples include $_POST, $_GET, $_SESSION, $_SERVER, and $GLOBALS.
PHP code usually starts with <?php and ends with ?>. Short tags <? and ?> are also supported if enabled in configuration. The long tag is preferred for portability.
<?php echo 'Hello'; ?>