Programming PHP

Here’s how to randomize the order of the days of the week:
$days = array('Monday', 'Tuesday', 'Wednesday',
'Thursday', 'Friday', 'Saturday', 'Sunday');
shuffle($days);
print_r($days);
Array
(
[0] => Tuesday
[1] => Thursday
[2] => Monday
[3] => Friday
[4] => Wednesday
[5] => Saturday
[6] => Sunday
)
Obviously, the order after your shuffle( ) may not be the same as the sample output
here. Unless you are interested in getting multiple random elements from an array,
without repeating any specific item, using the rand( ) function to pick an index is
more efficient.
Acting on Entire Arrays
PHP has several useful functions for modifying or applying an operation to all elements
of an array. You can merge arrays, find the difference, calculate the total, and
more, all using built-in functions.
Calculating the Sum of an Array
The array_sum( ) function adds up the values in an indexed or associative array:
$sum = array_sum(array);
For example:
$scores = array(98, 76, 56, 80);
$total = array_sum($scores);
// $total = 310
Merging Two Arrays
The array_merge( ) function intelligently merges two or more arrays:
$merged = array_merge(array1, array2 [, array ... ])
If a numeric key from an earlier array is repeated, the value from the later array is
assigned a new numeric key:
$first = array('hello', 'world'); // 0 => 'hello', 1 => 'world'
$second = array('exit', 'here'); // 0 => 'exit', 1 => 'here'
$merged = array_merge($first, $second);
// $merged = array('hello', 'world', 'exit', 'here')
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