Podcast
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:
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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Description
Test your knowledge about PHP arrays. Learn about creating arrays in PHP, indexed arrays, associative arrays, and multidimensional arrays. Practice accessing values in arrays using index numbers or named keys.
