1 / 21

PHP Arrays

PHP Arrays An indexed array is similar to one provided by a conventional programming language. An element of an associative array can be accessed by a keyword. An associative array is like a dictionary or map . An array element can be of any type.

omer
Download Presentation

PHP Arrays

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. PHP Arrays • An indexed array is similar to one provided by a conventional programming language. • An element of an associative array can be accessed by a keyword. • An associative array is like a dictionary or map. • An array element can be of any type. • An array can be heterogeneous with its element types and structure. • Many functions manipulating an array are provided.

  2. Indexed Array $animals = array("dog", "cat", "fish"); echo "$animals[0]\n"; echo "$animals[2]\n"; echo "$animals\n"; dog fish Array

  3. Updating and Adding Elements $animals = array("dog", "cat", "fish"); echo "$animals[1]\n"; $animals[1] = "tiger"; echo "$animals[1]\n"; $animals[] = "beaver"; echo "$animals[3]\n"; cat tiger beaver

  4. Associative Array $animals = array( "dog“ => 15,"cat“ = >8, "fish“ => 2); echo "$animals[cat]\n"; $animals["bat"] = 100; echo "$animals[bat]\n"; 8 100

  5. Listing array element: for $animals = array("dog", "cat", "fish"); for ($i = 0; $i < count($animals); $i++) { echo $i . "-th animal is a $animals[$i].\n"; } 0-th animal is a dog. 1-th animal is a cat. 2-th animal is a fish.

  6. Listing Array Elements: foreach $animals = array("dog", "cat", "fish"); foreach ($animals as $animal) echo "$animal\n"; } dog cat fish

  7. while and each $animals = array( "dog“ => 15,"cat“ => 8, "fish“ => 2); while ($item = each($animals)) print "weight of " . $item["key"] . " is " . $item["value"] . “.\n"; weight of dog is 15. weight of cat is 8. weight of fish is 2.

  8. each and list $animals = array( "dog“ => 15, "cat“ => 8, "fish“ => 2); while (list($key, $value) = each($animals)) print "weight of $key is $value.\n"; weight of dog is 15. weight of cat is 8. weight of fish is 2.

  9. Multi-Dimensional Heterogeneous Array $books = array( array("title“ => “A", "author“ => “X"), array("title“ => “B", “author“ => “Y", “price“ => 25) ); print_r($books); Array ( [0] => Array ( [title] => A [author] => X ) [1] => Array ( [title] => B [author] => Y [price] => 25 ) )

  10. Nested Loops for ($i=0; $i < count($books); $i++) { print "$i-th book is:"; while ( list($key, $value) = each($books[$i]) ) print “ $key: $value"; print "\n"; } 0-th book is: title: A author: X 1-th book is: title: B author: Y price: 25

  11. String as an Array $myString = "My chars"; echo "$myString\n"; echo "$myString[1]\n"; My chars y

  12. Array functions • count(), sizeof() • in_array() • array_slice() • array_pad() • array_reverse() • list( ) • Sorting Functions • sort(), rsort() • asort(), arsort() • ksort(), krsort()

  13. count(array1)andsizeof(array1) Returns the size of array array1. $animals = array ('dog', 'cat', 'fish'); echo count($animals); echo sizeof($animals); 3 3

  14. array array_pad(array1, length, value) Pad array to length length with value. Array ( [0] => 1 [1] => 2 [2] => 10 [3] => 10 [4] => 10 ) $scores = array(1, 2); $padded = array_pad($scores, 5, 10); print_r($padded);

  15. array array_reverse(array1) Return an array with elements in reverse order. $animals = array('dog', 'cat', 'fish'); $reversed array_reverse($animals); print_r($reversed); Array ( [0] => fish [1] => cat [2] => dog )

  16. array array_slice (array1, offset, length) Extract a slice of length from array1 starting at offset. $array1 = array(1, 2, 3, 4, 5, 6); $subarray = array_slice(array1, 3, 2); print_r($subarray); Array ( [0] => 4 [1] => 5 )

  17. boolean in_array(value, array1) Check if value exists in array1. $animals = array('dog', 'cat', 'fish'); echo in_array('cat', $animals); echo in_array(‘monkey', $animals); 1 (true) (false)

  18. void list(var1, var2, ...) The elements of an array are copied into the list of variables var1, var2, . . . $animals = array('dog', 'cat', 'fish'); list($a, $b, $c) = $animals; echo "$a, $b, $c"; dog, cat, fish

  19. sort(array)and rsort(array) Sort the elements in an array in increasing or decreasing order. $animals = array('dog', 'cat', fish'); sort($animals); print_r($animals); Array ( [0] => cat [1] => dog [2] => fish )

  20. asort(array), arsort(array) Sort an array maintaining index association. Array ( [1] => cat [0] => dog [2] => fish ) $animals = array('dog', 'cat', 'fish'); asort($animals); print_r($animals);

  21. ksort(array), krsort(array) Sort array by keys. $animals = array('dog' => 15, 'cat' => 8, 'fish' => 2); ksort($animals); print_r($animals); Array ( [cat] => 8 [dog] => 15 [fish] => 12 )

More Related