How can I merge two arrays (one with string => value pairs and another with int => value pairs) while keeping the string/int keys? None of them will ever overlap (because one has only strings and the other has only integers).
Here is my current code (which doesn’t work, because array_merge is re-indexing the array with integer keys):
// get all id vars by combining the static and dynamic $staticIdentifications = array( Users::userID => "USERID", Users::username => "USERNAME" ); // get the dynamic vars, formatted: varID => varName $companyVarIdentifications = CompanyVars::getIdentificationVarsFriendly($_SESSION['companyID']); // merge the static and dynamic vars (*** BUT KEEP THE INT INDICES ***) $idVars = array_merge($staticIdentifications, $companyVarIdentifications);
You can simply ‘add’ the arrays:
>> $a = array(1, 2, 3); array ( 0 => 1, 1 => 2, 2 => 3, ) >> $b = array("a" => 1, "b" => 2, "c" => 3) array ( 'a' => 1, 'b' => 2, 'c' => 3, ) >> $a + $b array ( 0 => 1, 1 => 2, 2 => 3, 'a' => 1, 'b' => 2, 'c' => 3, )
Considering that you have
$replaced = array('1' => 'value1', '4' => 'value4'); $replacement = array('4' => 'value2', '6' => 'value3');
$merge = $replacement + $replaced; will output:
Array('4' => 'value2', '6' => 'value3', '1' => 'value1');
The first array from sum will have values in the final output.
$merge = $replaced + $replacement; will output:
Array('1' => 'value1', '4' => 'value4', '6' => 'value3');
While this question is quite old I just want to add another possibility of doing a merge while keeping keys.
Besides adding key/values to existing arrays using the
+ sign you could do an
$a = array('foo' => 'bar', 'some' => 'string'); $b = array(42 => 'answer to the life and everything', 1337 => 'leet'); $merged = array_replace($a, $b);
The result will be:
Array ( [foo] => bar [some] => string  => answer to the life and everything  => leet )
Same keys will be overwritten by the latter array.
There is also an
array_replace_recursive, which do this for subarrays, too.
Two arrays can be easily added or union without chaning their original indexing by + operator. This will be very help full in laravel and codeigniter select dropdown.
$empty_option = array( ''=>'Select Option' ); $option_list = array( 1=>'Red', 2=>'White', 3=>'Green', ); $arr_option = $empty_option + $option_list;
Output will be :
$arr_option = array( ''=>'Select Option' 1=>'Red', 2=>'White', 3=>'Green', );
Try array_replace_recursive or array_replace functions
$a = array('userID' => 1, 'username'=> 2); array ( userID => 1, username => 2 ) $b = array('userID' => 1, 'companyID' => 3); array ( 'userID' => 1, 'companyID' => 3 ) $c = array_replace_recursive($a,$b); array ( userID => 1, username => 2, companyID => 3 )