Array methods

1. Array Methods

2. array_change_key_case
• Changes the case of all keys in an array
Syntax:
array_change_key_case(array $array, int $case)
case_lower: to convert to lower case
case_upper: to convert to upper case

3. Example:
<?php
$name =
array("abc"=>100,"def"=>200,"geh"=>300);
print_r(array_change_key_case($name,
CASE_UPPER));
?>

4. Output:

5. array_chunk
• Split an array into chunks
Syntax: array_chunk(array
$array, int $length, bool $preserve_keys)
Length:The size of each chunk
preserve_keys:When set to true keys will be
preserved. Default is false which will reindex the
chunk numerically

6. Example 1:
<?php
$input_array = array("a","b","c","d","e");
var_dump(array_chunk($input_array, 2,false));
?>

7. Output:

8. array_combine
• Creates an array by using one array for keys
and another for its values
Syntax:
array_combine(array $keys, array $values)

9. Example:
<?php
$a = array('Book', 'Pen', 'Diary');
$b =array('10', '20', '30');
$c = array_combine($a, $b);
print_r($c);
?>

10. Output:

11. array_merge
• Merge one or more arrays
• Syntax:
array_merge(array ...$arrays)

12. Example:
<?php
$a = array('10', '20', '30');
$b = array('40', '50', '60');
$c=array_merge($a,$b);
print_r($c);
?>

13. Output:

14. array_count_values
• Counts all the values of an array
Syntax:
array_count_values(array $array)

15. Example:
<?php
$a = array('10', '20', '30','40','20','10');
$c = array_count_values($a);
print_r($c);
?>

16. Output:

17. array_push
• Push one or more elements onto the end of
array
Syntax:
array_push(array &$array, mixed ...$values)

18. Example:
<?php
$fruits = array("kiwi", "grapes");
array_push($fruits, "apple", "mango");
print_r($fruits);
?>

19. Output:

20. array_pop
• Pop the element off the end of array
Syntax:
array_pop(array &$array)

21. Example:
<?php
$fruits = array("kiwi",
"grapes","mango","apple");
array_pop($fruits);
print_r($fruits);
?>

22. Output:

23. array_shift
• Shift an element off the beginning of array
Syntax:
array_shift(array &$array)

24. Example:
<?php
$stationary = array("pencil", "eraser",
"sharpner", "pen");
array_shift($stationary);
print_r($stationary);
?>

25. Output:

26. array_unshift
• Prepend one or more elements to the
beginning of an array
Syntax:
array_unshift(array &$array, mixed ...$values)

27. Example:
<?php
$stationary = array("pencil", "eraser",
"sharpner", "pen");
array_unshift($stationary,"glue");
print_r($stationary);
?>

28. Output:

29. sort
Sort an array in ascending order
Syntax:
sort(array &$array, int $flags = SORT_REGULAR)

30. Example:
<?php
$num = array(2,6,8,3,1,9);
asort($num);
var_dump($num);
?>

31. Output:

32. rsort
• Sort an array in descending order
Syntax:
rsort(array &$array, int $flags = SORT_REGULAR)

33. Example:
<?php
$num = array(2,6,8,3,1,9);
rsort($num);
print_r($num);
?>

34. Output:

35. asort
• Sort an array in ascending order and maintain
index association
Syntax:
asort(array &$array, int $flags = SORT_REGULAR)

36. Example:
<?php
$fruits = array(“l" => "lemon", "g" => "grapes",
"n" => "nuts", "a" => "apple");
asort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $valn";
}
?>

37. Output:

38. arsort
Sort an array in descending order and maintain
index association
Syntax:
arsort(array &$array, int $flags = SORT_REGULAR)

39. Example:
<?php
$fruits = array("l" => "lemon", "g" => "grapes",
"n" => "nuts", "a" => "apple");
arsort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $valn";
}
?>

40. Output:

41. array_slice
• Extract a slice of the array
Syntax:
array_slice(
array $array,
int $offset,
?int $length = null,
bool $preserve_keys = false
)

42. Example:
<?php
$num = array(1,3,5,6,17,8,4,10);
$sliced=array_slice($num,3,4);
print_r($sliced);
?>

43. Output:

44. array_pad
• Pad array to the specified length with a value
Syntax:
array_pad(array $array, int $length, mixed $valu
e): array
• lengthNew size of the array.
• valueValue to pad if array is less than length.

45. Example:
<?php
$old_ar = array(1, 2, 3);
$result = array_pad($old_ar, 5, 0);
print_r($result);
?>

46. Output:

47. array_splice
• Remove a portion of the array and replace it with
something else
Syntax:
array_splice(
array &$array,
int $offset,
?int $length = null,
mixed $replacement = []
):

48. Example:
<?php
$input = array("red", "green", "blue", "yellow");
array_splice($input, 1,2, "apple");
var_dump($input);
?>

49. Output:

50. list
• Assign variables as if they were an array
Syntax:
list(mixed $var, mixed ...$vars = ?)

51. Example:
<?php
$info = array('Students', 'BCA', 'GGSIPU');
list($who, $what, $where) = $info;
echo "$who are doing $what from $where";
?

52. Output: