Php array

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. PHP Array

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

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

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

Listing array element : for PHP Array $animals = array("dog", "cat", "fish"); for ($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.

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

while and each PHP Array $animals = array( "dog“ => 15,"cat“ => 8, "fish“ => 2); while ($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.

each and list PHP Array $animals = array( "dog“ => 15, "cat“ => 8, "fish“ => 2); while (list($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.

Multi-Dimensional Heterogeneous Array PHP 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 ) )

Nested Loops PHP Array 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

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

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

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

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

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

array array_slice (array1, offset, length) PHP Array 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 )

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

void list(var1, var2, ...) PHP Array 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

sort(array) and rsort(array) PHP 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 )

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

ksort(array), krsort(array) PHP 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 )

Php array

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