Tuesday, 20 May 2014

Simple Example of PHP Array Function


Simple Example of PHP Array Function
Predefined  functions:
1: sizeof():This function returns the number of elements in an array.
Eg:  

$data = array("red", "green", "blue");
echo "Array has " . sizeof($data) . " elements";

Output:
Array has 3 elements

2: array_values($arr): This function accepts a PHP array and returns a new array containing only its values (not its keys).
Eg :$data = array("hero" => "Holmes", "villain" => "Moriarty");
print_r(array_values($data));

Output:
Array
(
[0] => Holmes,[1] => Moriarty)

3: array_pop($arr): This function removes an element from the end of an array.
$data = array("Donald", "Jim", "Tom");
array_pop($data);
print_r($data);
?> 
Output:
Array(
[0] => Donald
[1] => Jim
)
4: array_push($arr, $val): This function adds an element to the end of an array.
$data = array("Donald", "Jim", "Tom");
array_push($data, "Harry");
print_r($data);
?> 
Output:
Array
(
[0] => Donald
[1] => Jim
[2] => Tom
[3] => Harry
)
5)array_shift($arr): This function removes an element from the beginning of an array.

6)array_unshift($arr, $val): This function adds an element to the beginning of an array.
$data = array("Donald", "Jim", "Tom");
array_unshift($data, "Sarah");
print_r($data);
?> 
Output:
Array
(
[0] => Sarah
[1] => Donald
[2] => Jim
[3] => Tom
)
7:each($arr):  This function is most often used to iteratively traverse an array. Each time each() is called, it returns the current key-value pair and moves the array cursor forward one element. This makes it most suitable for use in a loop.

$data = array("hero" => "Holmes", "villain" => "Moriarty");
while (list($key, $value) = each($data)) {
echo "$key: $value \n";
}
?>
Output:
hero: Holmes
villain: Moriarty
8:sort($arr)    This function sorts the elements of an array in ascending order. String values will be arranged in ascending alphabetical order.
Note: Other sorting functions include asort(), arsort(), ksort(), krsort() and rsort(). 
$data = array("g", "t", "a", "s");
sort($data);
print_r($data);
?>

Output:
Array
(
[0] => a
[1] => g
[2] => s
[3] => t
)
9:array_reverse($arr)           The function reverses the order of elements in an array.
Use this function to re-order a sorted list of values in reverse for easier processing—for example, when you're trying to begin with the minimum or maximum of a set of ordered values.
$data = array(10, 20, 25, 60);
print_r(array_reverse($data));
?>
Output:
Array
(
[0] => 60
[1] => 25
[2] => 20
[3] => 10
)
10:array_merge($arr)This function merges two or more arrays to create a single composite array. Key collisions are resolved in favor of the latest entry.
Use this function when you need to combine data from two or more arrays into a single structure—for example, records from two different SQL queries

$data1 = array("cat", "goat");
$data2 = array("dog", "cow");
print_r(array_merge($data1, $data2));

Output:
Array
(
[0] => cat
[1] => goat
[2] => dog
[3] => cow
)
11:array_rand($arr)  This function selects one or more random elements from an array.
Use this function when you need to randomly select from a collection of discrete values—for example, picking a random color from a list.

$data = array("white", "black", "red");
echo "Today's color is " . $data[array_rand($data)];

Output:
Today's color is red

12: array_search($search, $arr):This function searches the values in an array for a match to the search term, and returns the corresponding key if found. If more than one match exists, the key of the first matching value is returned.
Use this function to scan a set of index-value pairs for matches, and return the matching index.   Code:
$data = array("blue" => "#0000cc", "black" => "#000000", "green" => "#00ff00");
echo "Found " . array_search("#0000cc", $data);
?>

Output:
Found blue

13:array_unique($data)This function strips an array of duplicate values.
Use this function when you need to remove non-unique elements from an array—for example, when creating an array to hold values for a table's primary key.
$data = array(1,1,4,6,7,4);
print_r(array_unique($data));

Output:
Array
(
[0] => 1
[3] => 6
[4] => 7
[5] => 4
)

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