ARRAY_WALK_RECURSIVE(3) 1 ARRAY_WALK_RECURSIVE(3)array_walk_recursive - Apply a user function recursively to every member of an arraySYNOPSIS
bool array_walk_recursive NULL (array &$array, callable $callback, [mixed $userdata])
DESCRIPTION
Applies the user-defined $callback function to each element of the $array. This function will recurse into deeper arrays.
PARAMETERS
o $array
- The input array.
o $callback
- Typically, $callback takes on two parameters. The $array parameter's value being the first, and the key/index second.
Note
If $callback needs to be working with the actual values of the array, specify the first parameter of $callback as a refer-
ence. Then, any changes made to those elements will be made in the original array itself.
o $userdata
- If the optional $userdata parameter is supplied, it will be passed as the third parameter to the $callback.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
array_walk_recursive(3) example
<?php
$sweet = array('a' => 'apple', 'b' => 'banana');
$fruits = array('sweet' => $sweet, 'sour' => 'lemon');
function test_print($item, $key)
{
echo "$key holds $item
";
}
array_walk_recursive($fruits, 'test_print');
?>
The above example will output:
a holds apple
b holds banana
sour holds lemon
You may notice that the key ' sweet' is never displayed. Any key that holds an array will not be passed to the function.
SEE ALSO array_walk(3), information about the callback type.
PHP Documentation Group ARRAY_WALK_RECURSIVE(3)
Check Out this Related Man Page
ARSORT(3) 1 ARSORT(3)arsort - Sort an array in reverse order and maintain index associationSYNOPSIS
bool arsort (array &$array, [int $sort_flags = SORT_REGULAR])
DESCRIPTION
This function sorts an array such that array indices maintain their correlation with the array elements they are associated with.
This is used mainly when sorting associative arrays where the actual element order is significant.
PARAMETERS
o $array
- The input array.
o $sort_flags
- You may modify the behavior of the sort using the optional parameter $sort_flags, for details see sort(3).
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
arsort(3) example
<?php
$fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
arsort($fruits);
foreach ($fruits as $key => $val) {
echo "$key = $val
";
}
?>
The above example will output:
a = orange
d = lemon
b = banana
c = apple
The fruits have been sorted in reverse alphabetical order, and the index associated with each element has been maintained.
SEE ALSO asort(3), The comparison of array sorting functions.
PHP Documentation Group ARSORT(3)
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