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Questions and Answers
What is PHP?
What is PHP?
- A loosely typed language (correct)
- A weakly typed language
- A tightly typed language
- A strongly typed language
What does the $$var (double dollar) do in PHP?
What does the $$var (double dollar) do in PHP?
- Stores no value at all.
- Stores any value like string, integer, float, etc.
- Stores the value of the $variable outside it.
- Stores the value of the $variable inside it. (correct)
In the first example, what is the value of the variable x?
In the first example, what is the value of the variable x?
- abc (correct)
- $$x
- 200
- $x
What is the error in the variableinvalid.php file?
What is the error in the variableinvalid.php file?
What is the value of $Cat in the third example?
What is the value of $Cat in the third example?
What does PHP do automatically?
What does PHP do automatically?
What is the purpose of $var (single dollar) in PHP?
What is the purpose of $var (single dollar) in PHP?
What is the value of ${$name} in the third example?
What is the value of ${$name} in the third example?
What is printed first in the first example?
What is printed first in the first example?
What is the purpose of the default statement in a PHP switch flowchart?
What is the purpose of the default statement in a PHP switch flowchart?
What is the main difference between a PHP for loop and a PHP while loop?
What is the main difference between a PHP for loop and a PHP while loop?
What is the purpose of a PHP nested for loop?
What is the purpose of a PHP nested for loop?
What is the output of the PHP code: for($i=1; $i<=10; $i++){echo $i;}
What is the output of the PHP code: for($i=1; $i<=10; $i++){echo $i;}
What is the purpose of a PHP for each loop?
What is the purpose of a PHP for each loop?
What is the syntax of a PHP for loop?
What is the syntax of a PHP for loop?
What is the output of the PHP code: $i=1; while($i<=10){echo $i; $i++;}
What is the output of the PHP code: $i=1; while($i<=10){echo $i; $i++;}
What happens when the inner loop is fully executed in a PHP nested for loop?
What happens when the inner loop is fully executed in a PHP nested for loop?
What is the purpose of the increment/decrement statement in a PHP for loop?
What is the purpose of the increment/decrement statement in a PHP for loop?
What is the main difference between a do-while loop and a while loop in PHP?
What is the main difference between a do-while loop and a while loop in PHP?
What is the purpose of the break statement in PHP?
What is the purpose of the break statement in PHP?
What happens when a break statement is used inside an inner loop?
What happens when a break statement is used inside an inner loop?
What is the main advantage of using PHP functions?
What is the main advantage of using PHP functions?
What is a characteristic of a PHP do-while loop?
What is a characteristic of a PHP do-while loop?
What happens when a PHP break statement is used inside a for loop?
What happens when a PHP break statement is used inside a for loop?
What is a type of function that can be defined in PHP?
What is a type of function that can be defined in PHP?
What is the purpose of a PHP function?
What is the purpose of a PHP function?
What is a feature of PHP functions?
What is a feature of PHP functions?
What is the purpose of the acos() function in PHP?
What is the purpose of the acos() function in PHP?
Which PHP function returns the largest of the given numbers?
Which PHP function returns the largest of the given numbers?
What is the purpose of the $_GET superglobal in PHP?
What is the purpose of the $_GET superglobal in PHP?
What is the purpose of the tan() function in PHP?
What is the purpose of the tan() function in PHP?
What is the purpose of the rand() function in PHP?
What is the purpose of the rand() function in PHP?
What is the purpose of the ceil() function in PHP?
What is the purpose of the ceil() function in PHP?
What is the purpose of the $_POST superglobal in PHP?
What is the purpose of the $_POST superglobal in PHP?
What is the purpose of the log() function in PHP?
What is the purpose of the log() function in PHP?
What is the purpose of the sin() function in PHP?
What is the purpose of the sin() function in PHP?
What is the main advantage of using associative arrays in PHP?
What is the main advantage of using associative arrays in PHP?
How can you define an associative array in PHP?
How can you define an associative array in PHP?
What is the output of the code $salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");
What is the output of the code $salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");
What is a multidimensional array in PHP?
What is a multidimensional array in PHP?
What is the purpose of a multidimensional array in PHP?
What is the purpose of a multidimensional array in PHP?
How can you represent a multidimensional array in PHP?
How can you represent a multidimensional array in PHP?
What is the advantage of using a multidimensional array to store tabular data?
What is the advantage of using a multidimensional array to store tabular data?
What is the syntax to define a multidimensional array in PHP?
What is the syntax to define a multidimensional array in PHP?
What is the output of the code $emp = array(array(1,"sonoo",400000), array(2,"john",500000), array(3,"rahul",300000));
What is the output of the code $emp = array(array(1,"sonoo",400000), array(2,"john",500000), array(3,"rahul",300000));
What is the default index number assigned to PHP array elements?
What is the default index number assigned to PHP array elements?
What is the purpose of using PHP arrays?
What is the purpose of using PHP arrays?
How many types of arrays are there in PHP?
How many types of arrays are there in PHP?
What is the symbol used in PHP to associate a name with each array element?
What is the symbol used in PHP to associate a name with each array element?
What is a multidimensional array in PHP?
What is a multidimensional array in PHP?
What is the advantage of using a multidimensional array to store tabular data?
What is the advantage of using a multidimensional array to store tabular data?
How can you define an associative array in PHP?
How can you define an associative array in PHP?
What is the default representation of elements in a PHP indexed array?
What is the default representation of elements in a PHP indexed array?
How can you traverse a PHP array?
How can you traverse a PHP array?
What is the purpose of the count() function in PHP?
What is the purpose of the count() function in PHP?
What is the symbol used to associate a name/label with each array element in PHP?
What is the symbol used to associate a name/label with each array element in PHP?
What is the output of the code $size=array('Big','Medium','Short');
What is the output of the code $size=array('Big','Medium','Short');
How can you define an associative array in PHP?
How can you define an associative array in PHP?
What is a characteristic of a multidimensional array in PHP?
What is a characteristic of a multidimensional array in PHP?
What is an advantage of using associative arrays in PHP?
What is an advantage of using associative arrays in PHP?
How can you define a multidimensional array in PHP?
How can you define a multidimensional array in PHP?
What is the purpose of a multidimensional array in PHP?
What is the purpose of a multidimensional array in PHP?
How can you define an associative array in PHP?
How can you define an associative array in PHP?
What is the output of the code $salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");
What is the output of the code $salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");
What is the main difference between an associative array and a multidimensional array?
What is the main difference between an associative array and a multidimensional array?
What is an example of a tabular data that can be stored in a multidimensional array?
What is an example of a tabular data that can be stored in a multidimensional array?
What is the purpose of the PHP array_chunk() function?
What is the purpose of the PHP array_chunk() function?
What does the PHP count() function return?
What does the PHP count() function return?
What is the purpose of the PHP array_reverse() function?
What is the purpose of the PHP array_reverse() function?
What does the PHP array_search() function return?
What does the PHP array_search() function return?
What is the purpose of the PHP array_intersect() function?
What is the purpose of the PHP array_intersect() function?
How can you create a multidimensional array in PHP?
How can you create a multidimensional array in PHP?
What is the default index number assigned to PHP array elements?
What is the default index number assigned to PHP array elements?
What is the purpose of the PHP array_change_key_case() function?
What is the purpose of the PHP array_change_key_case() function?
What is the output of the PHP code: array('sonoo'=>'400000', 'john'=>'500000', 'rahul'=>'300000')?
What is the output of the PHP code: array('sonoo'=>'400000', 'john'=>'500000', 'rahul'=>'300000')?
What is the purpose of the PHP array_chunk() function?
What is the purpose of the PHP array_chunk() function?
How can you define a multidimensional array in PHP?
How can you define a multidimensional array in PHP?
What is the purpose of an associative array in PHP?
What is the purpose of an associative array in PHP?
What is the output of the code: array('SONOO'=>'550000', 'VIMAL'=>'250000', 'RATAN'=>'200000')?
What is the output of the code: array('SONOO'=>'550000', 'VIMAL'=>'250000', 'RATAN'=>'200000')?
What is the purpose of the PHP array() function?
What is the purpose of the PHP array() function?
What is the purpose of the foreach loop in PHP?
What is the purpose of the foreach loop in PHP?
What is the output of the code: foreach( $array as $var ){ echo 'Season is: ' . $var; }
What is the output of the code: foreach( $array as $var ){ echo 'Season is: ' . $var; }
What is the purpose of the while loop in PHP?
What is the purpose of the while loop in PHP?
What is the output of the code: while($i <= 10){ echo $i; $i++; }
What is the output of the code: while($i <= 10){ echo $i; $i++; }
What is the purpose of a nested while loop in PHP?
What is the purpose of a nested while loop in PHP?
What is the output of the code: $salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");
What is the output of the code: $salary=array("Sonoo"=>"550000","Vimal"=>"250000","Ratan"=>"200000");
What is the purpose of a multidimensional array in PHP?
What is the purpose of a multidimensional array in PHP?
How can you represent a multidimensional array in PHP?
How can you represent a multidimensional array in PHP?
What is the default index number assigned to PHP array elements?
What is the default index number assigned to PHP array elements?
How many types of arrays are there in PHP?
How many types of arrays are there in PHP?
Study Notes
PHP: Loosely Typed Language
- PHP is a loosely typed language, which means it automatically converts variables to their correct data type.
- PHP has two types of variables: $var (single dollar) and $$var (double dollar).
- $var is a normal variable that stores any value (string, integer, float, etc.).
- $$var is a reference variable that stores the value of the $variable inside it.
PHP Variables
- In PHP, variables do not need to be declared before they are used.
- PHP automatically converts the variable to its correct data type.
PHP Switch Statement
- The switch statement is used to execute one code block among many alternatives.
- It should be used when the number of iterations is known.
- Syntax:
switch (variable) { case value: code; break; ... }
PHP Loops
- PHP has several types of loops: for, while, do-while, and foreach.
- For loop:
for (initialization; condition; increment/decrement) { code } - While loop:
while (condition) { code } - Do-while loop:
do { code } while (condition); - Foreach loop:
foreach (array as value) { code }
PHP Functions
- A PHP function is a piece of code that can be reused many times.
- Functions can take input as arguments and return values.
- Advantages of PHP functions:
- Code reusability
- Easy to remember elements
PHP Arrays
- PHP arrays are used to store collections of data.
- Types of arrays: indexed, associative, and multidimensional.
- Indexed array:
$salary = array("550000", "250000", "200000"); - Associative array:
$salary = array("Sonoo"=>"550000", "Vimal"=>"250000", "Ratan"=>"200000"); - Multidimensional array:
$emp = array(array(1,"sonoo",400000), array(2,"john",500000), array(3,"rahul",300000));
PHP Math Functions
- PHP has several built-in math functions:
abs()acos()acosh()asin()asinh()atan()atan2()atanh()base_convert()bindec()ceil()cos()cosh()decbin()dechex()decoct()deg2rad()exp()expm1()floor()fmod()getrandmax()hexdec()hypot()is_finite()is_infinite()is_nan()lcg_value()log()log10()log1p()max()min()mt_getrandmax()mt_rand()mt_srand()octdec()pi()pow()rad2deg()rand()round()sin()sinh()sqrt()srand()tan()tanh()
PHP Form Handling
- PHP can create and use forms to get user input.
- To get form data, PHP uses superglobals
$_GETand$_POST. $_GETis used for get requests, and$_POSTis used for post requests.- Get requests are not secured, and the data is visible on the URL browser.
- Post requests are widely used for submitting forms with large amounts of data, such as file uploads and login forms.
PHP Arrays
- PHP arrays are ordered maps that contain values based on keys.
- Advantages of PHP arrays:
- Less code: No need to define multiple variables.
- Easy to traverse: Can traverse all elements with a single loop.
- Sorting: Can sort elements of the array.
- Types of PHP arrays:
- Indexed arrays
- Associative arrays
- Multidimensional arrays
PHP Indexed Arrays
- Indexed arrays are represented by an index number that starts from 0.
- Can store numbers, strings, or objects in the array.
- Two ways to define indexed arrays:
- 1st way:
$size = array("Big", "Medium", "Short"); - 2nd way:
$size = "Big"; $size = "Medium"; $size = "Short";
- 1st way:
PHP Associative Arrays
- Associative arrays associate a name/label with each array element using the
=>symbol. - Two ways to define associative arrays:
- 1st way:
$salary = array("Sonoo" => "550000", "Vimal" => "250000", "Ratan" => "200000"); - 2nd way:
$salary["Sonoo"] = "550000"; $salary["Vimal"] = "250000"; $salary["Ratan"] = "200000";
- 1st way:
PHP Multidimensional Arrays
- Multidimensional arrays are arrays of arrays.
- Allow storing tabular data in an array.
- Example:
$emp = array(array(1, "sonoo", 400000), array(2, "john", 500000), array(3, "rahul", 300000));
Traversing PHP Arrays
- Can traverse arrays using a foreach loop.
- Example:
foreach ($array as $var) { // code to be executed }
PHP Array Functions
array(): Creates and returns an array.array_change_key_case(): Changes the case of all keys in an array.array_chunk(): Splits an array into chunks.count(): Counts all elements in an array.sort(): Sorts all elements in an array.array_reverse(): Returns an array with elements in reversed order.array_search(): Searches for a specified value in an array.array_intersect(): Returns the intersection of two arrays.
PHP Strings
- A PHP string is a sequence of characters used to store and manipulate text.
- Four ways to specify a string in PHP:
- Single quoted
- Double quoted
- Heredoc syntax
- Newdoc syntax (since PHP 5.3)
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Description
PHP variables, loosely typed language, and data types concepts. Learn about single dollar and double dollar variables in PHP. Understand how PHP handles variables and data types automatically.
