Note that function will NOT replace a sub-tree from you $array1 if its value in $array2 is an empty array.
Even tho the key for this dimension is technically 'set'.
(I suppose it treats it as just another recursive level to dive in, finding no key to compare, backtracking while leaving this sub-tree alone)
For example:
$array1 = ['first' => ['second' => 'hello']];
$array2 = ['first' => []];
$result = array_replace_recursive($array1, $array2);
$result is still: ['first' => ['second' => 'hello']].
array_replace_recursive
(PHP 5 >= 5.3.0, PHP 7)
array_replace_recursive — Replaces elements from passed arrays into the first array recursively
설명
array array_replace_recursive
( array
$array1
, array $array2
[, array $...
] )
array_replace_recursive() replaces the values of
array1 with the same values from all the following
arrays. If a key from the first array exists in the second array, its value
will be replaced by the value from the second array. If the key exists in the
second array, and not the first, it will be created in the first array.
If a key only exists in the first array, it will be left as is.
If several arrays are passed for replacement, they will be processed
in order, the later array overwriting the previous values.
array_replace_recursive() is recursive : it will recurse into arrays and apply the same process to the inner value.
When the value in array1 is scalar, it will be replaced
by the value in array2, may it be scalar or array.
When the value in array1 and array2
are both arrays, array_replace_recursive() will replace
their respective value recursively.
인수
-
array1 -
The array in which elements are replaced.
-
array2 -
The array from which elements will be extracted.
-
... -
Optional. More arrays from which elements will be extracted.
반환값
Returns an array, or NULL if an error occurs.
예제
Example #1 array_replace_recursive() example
<?php
$base = array('citrus' => array( "orange") , 'berries' => array("blackberry", "raspberry"), );
$replacements = array('citrus' => array('pineapple'), 'berries' => array('blueberry'));
$basket = array_replace_recursive($base, $replacements);
print_r($basket);
$basket = array_replace($base, $replacements);
print_r($basket);
?>
위 예제의 출력:
Array
(
[citrus] => Array
(
[0] => pineapple
)
[berries] => Array
(
[0] => blueberry
[1] => raspberry
)
)
Array
(
[citrus] => Array
(
[0] => pineapple
)
[berries] => Array
(
[0] => blueberry
)
)
Example #2 array_replace_recursive() and recursive behavior
<?php
$base = array('citrus' => array("orange") , 'berries' => array("blackberry", "raspberry"), 'others' => 'banana' );
$replacements = array('citrus' => 'pineapple', 'berries' => array('blueberry'), 'others' => array('litchis'));
$replacements2 = array('citrus' => array('pineapple'), 'berries' => array('blueberry'), 'others' => 'litchis');
$basket = array_replace_recursive($base, $replacements, $replacements2);
print_r($basket);
?>
위 예제의 출력:
Array
(
[citrus] => Array
(
[0] => pineapple
)
[berries] => Array
(
[0] => blueberry
[1] => raspberry
)
[others] => litchis
)
참고
- array_replace() - Replaces elements from passed arrays into the first array
- array_merge_recursive() - 두개 이상의 배열을 재귀적으로 병합
add a note
User Contributed Notes 1 note
Pau Prat Torrella ¶
4 years ago
