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Questions and Answers
What does the PHP function array_reverse() do?
What does the PHP function array_reverse() do?
- Sort all elements in an array
- Count the number of elements in an array
- Return an array with elements in reversed order (correct)
- Search for a specific value in an array
Which PHP function returns the intersection of two arrays?
Which PHP function returns the intersection of two arrays?
- array_search()
- count()
- array_intersect() (correct)
- array_chunk()
What is the output of the PHP array_search() function if the search is successful?
What is the output of the PHP array_search() function if the search is successful?
- The index where the value is found (correct)
- The matching elements of two arrays
- The value being searched for
- The number of elements in the array
How does the PHP function count() differ from array_search()?
How does the PHP function count() differ from array_search()?
What is the purpose of the PHP sort() function?
What is the purpose of the PHP sort() function?
In PHP, what does the array_chunk() function do?
In PHP, what does the array_chunk() function do?
How does array_reverse() differ from array_intersect() in PHP?
How does array_reverse() differ from array_intersect() in PHP?
When using PHP's count() function on an array, what does it return?
When using PHP's count() function on an array, what does it return?
What happens when PHP's array_intersect() is used on two arrays with no matching elements?
What happens when PHP's array_intersect() is used on two arrays with no matching elements?
'PHP sort() function sorts all the elements' - This statement is:
'PHP sort() function sorts all the elements' - This statement is:
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Study Notes
PHP Arrays
- An array stores multiple values in one single variable.
- An array is a special variable that can hold more than one value at a time.
- An array can hold many values under a single name, and values can be accessed by referring to an index number.
Creating an Array in PHP
- The
array()function is used to create an array in PHP. - There are three types of arrays in PHP: Indexed, Associative, and Multidimensional arrays.
PHP Indexed Arrays
- Indexed arrays can be created in two ways: automatic index assignment (index starts at 0) or manual index assignment.
- Example:
$cars = array("Volvo", "BMW", "Toyota");or$cars[0] = "Volvo"; $cars[1] = "BMW"; $cars[2] = "Toyota"; - Indexed arrays can be looped through and printed using a
forloop.
PHP Associative Arrays
- Associative arrays use named keys assigned to them.
- Associative arrays can be created in two ways: using the
array()function or by assigning values individually. - Example:
$age = array("Rohit"=>"23", "Kapil"=>"19", "Neeraj"=>"20");or$age['Rohit'] = "23"; $age['Kapil'] = "19"; $age['Neeraj'] = "20"; - Named keys can be used in a script to access values.
PHP Multidimensional Arrays
- Multidimensional arrays are arrays containing one or more arrays.
- PHP supports multidimensional arrays that are two, three, four, five, or more levels deep.
- Multidimensional arrays can be used to store complex data, such as tables.
- Example:
$std = array ( array("Romya", "BCA", 1), array("Madhur", "BCA", 2), ... ); - Multidimensional arrays can be accessed using row and column indices.
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