PHP

Sorting PHP Array values

 

 

There may be times when you want to sort the values inside of an array. For
example, suppose your array values are not in alphabetical order. Like this
one:

$full_name = array();

$full_name[“Roger”] = “Waters”;
$full_name[“Richard”] = “Wright”;
$full_name[“Nick”] = “Mason”;
$full_name[“David”] = “Gilmour”;

To sort this array, you just use the assort( ) function. This involves
nothing more complex than typing the word asort, followed by round brackets.
In between the round brackets, type in the name of your Associative array:

asort( $full_name );

The letter “a” tells PHP that the array is an Associative
one. (If you don’t have the “a” before “sort”, your key
names will turn in to numbers!). The “a” also tells PHP to sort
by the Value, and NOT by the key. In our script above, the surnames will be
sorted. If you want to sort using the Key, then you can use ksort() instead.

If you have a Scalar array (numbers as Keys), then you leave the “a”
off. Like this:

$numbers = array( );

$numbers[ ]=”2″;
$numbers[ ]=”8″;
$numbers[ ]=”10″;
$numbers[ ]=”6″;

sort($numbers);

print $numbers[0];
print $numbers[1];
print $numbers[2];
print $numbers[3];

The numbers are then sorted from lowest to highest. If you want to sort in
reverse order then you need the following:

rsort( ) – Sorts a Scalar array
in reverse order
arsort( ) – Sorts the Values in an Associative array in reverse order
krsort( ) – Sorts the Keys in an Associative array in reverse order

In the next part, we look at how to get a random value from an array.

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