How can assign the values from one array to another array? For example:
//array with empty value
$targetArray = array(
'a' => '',
'b' => '',
'c' => '',
'd' => ''
);
// array with non-empty values, but might be missing keys from the target array
$sourceArray = array(
'a'=>'a',
'c'=>'c',
'd'=>'d'
);
The result I would like to see is the following:
$resultArray = array(
'a'=>'a',
'b'=>'',
'c'=>'c',
'd'=>'d'
);
I think the function you are looking for is array_merge.
$resultArray = array_merge($targetArray,$sourceArray);
Use array_merge:
$merged = array_merge($targetArray, $sourceArray);
// will result array('a'=>'a','b'=>'','c'=>'c','d'=>'d');
Use array_merge():
$targetArray = array('a'=>'','b'=>'','c'=>'','d'=>'');
$sourceArray = array('a'=>'a','c'=>'c','d'=>'d');
$result = array_merge( $targetArray, $sourceArray);
This outputs:
array(4) {
["a"]=>
string(1) "a"
["b"]=>
string(0) ""
["c"]=>
string(1) "c"
["d"]=>
string(1) "d"
}
Perhaps a more intuitive/indicative function for this task is array_replace(). It performs identically to array_merge() on associative arrays. (Demo)
var_export(
array_replace($targetArray, $sourceArray)
);
Output:
array (
'a' => 'a',
'b' => '',
'c' => 'c',
'd' => 'd',
)
A similar but not identical result can be achieved with the union operator, but notice that its input parameters are in reverse order and the output array has keys from $targetArray then keys from $sourceArray.
var_export($sourceArray + $targetArray);
Output:
array (
'a' => 'a',
'c' => 'c',
'd' => 'd',
'b' => '',
)
