Description
array
array_merge ( array array1 [, array array2 [, array ...]] )
array_merge() merges the elements of one or
more arrays together so that the values of one are appended to
the end of the previous one. It returns the resulting array.
If the input arrays have the same string keys, then the later value for
that key will overwrite the previous one. If, however, the arrays
contain numeric keys, the later value will not overwrite the original value, but will be
appended.
If only one array is given and the array is numerically indexed, the
keys get reindexed in a continuous way.
Example 1. array_merge() example
<?php
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?>
|
The above example will output:
Array
(
[color] => green
[0] => 2
[1] => 4
[2] => a
[3] => b
[shape] => trapezoid
[4] => 4
)
|
|
Example 2. Simple array_merge() example
<?php
$array1 = array();
$array2 = array(1 => "data");
$result = array_merge($array1, $array2);
?>
|
Don't forget that numeric keys will be renumbered!
If you want to completely preserve the arrays and just want to append
them to each other, use the + operator:
<?php
$array1 = array();
$array2 = array(1 => "data");
$result = $array1 + $array2;
?>
|
The numeric key will be preserved and thus the association remains.
|
| Warning |
The behavior of array_merge() was modified in PHP 5. Unlike PHP 4, array_merge()
now only accepts parameters of type array. However, you can use typecasting
to merge other types. See the example below for details.
Example 3. array_merge() PHP 5 example
<?php
$beginning = 'foo';
$end = array(1 => 'bar');
$result = array_merge((array)$beginning, (array)$end);
print_r($result);
?>
|
The above example will output:
Array
(
[0] => foo
[1] => bar
)
|
|
|
See also array_merge_recursive(),
array_combine() and
array operators.
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