[PHP 5, PHP 7, PHP 8]
array_combine — Creates an array by using one array for keys and another for its values
Description
array_combine[array $keys, array $values]: array
Parameters
keysArray of keys to be used. Illegal values for key will be converted to string.
valuesArray of values to be used
Return Values
Returns the combined array.
Errors/Exceptions
As of PHP 8.0.0, a
ValueError is thrown if the number of elements in keys and values does not match. Prior to PHP 8.0.0, a E_WARNING was emitted instead.
Changelog
| 8.0.0 | array_combine[] will now throw a ValueError if the number of elements for each array is not equal; previously this function returned false instead.
|
Examples
Example #1 A simple array_combine[] example
The above example will output:
Array
[
[green] => avocado
[red] => apple
[yellow] => banana
]
See Also
- array_merge[] - Merge one or more arrays
- array_walk[] - Apply a user supplied function to every member of an array
- array_values[] - Return all the values of an array
loureirorg at gmail dot com ¶
9 years ago
If two keys are the same, the second one prevails.
Example:
Returns:
Array
[
[a] => 2
[b] => 3
]
But if you need to keep all values, you can use the function below:
Returns:
Array
[
[a] => Array
[
[0] => 1
[1] => 2
]
[b] => 3
]
welcome at el hyphen mustafa ¶
6 years ago
Further to loreiorg's script
in order to preserve duplicate keys when combining arrays.
I have modified the script to use a closure instead of create_function
Reason: see security issue flagged up in the documentation concerning create_function
claude dot pache at gmail dot com ¶
12 years ago
array_combine[] has a strange bug/misfeature [as of PHP 5.3.2]: There is no logical reason for throwing a warning and returning FALSE, instead of returning [see //bugs.php.net/bug.php?id=34857]. Here is a quick workaround:
quecoder at gmail ¶
14 years ago
zequez at gmail dot com ¶
11 years ago
If two keys are the same, the second one prevails.
Example:
Returns:
Array
[
[a] => 2
[b] => 3
]
g.REMOVETHIS.vincendon AT vithemis.com ¶
10 years ago
I was looking for a function that could combine an array to multiple one, for my MySQL GROUP_CONCAT[] query, so I made this function.
dejiakala at gmail dot com ¶
10 years ago
I needed to read CSV files into associative arrays with column headers as keys. Then I ran into a problem when you have empty columns at the end of a row because array_combine returns false if both arrays don't have the same number of elements. This function based on quecoder at gmail's combine_arr[] below allowed me to pad either array or not when parsing my CSVs to arrays.
$a is the array of header columns and $b is an array of the current row retrieved with fgetcsv[]
What can you do? In my case, I was just zipping up some select-box options, so I converted everything in my floats to strings.
Anonymous ¶
8 months ago
Here a way to manage no uniqueness keys case. Values of duplicate keys are put in an array.
Results: Array [ [one] => green [two] => blue ]
NOT: Array [ [one] => red [one] => green [two] => blue ]
xavier at api-meal dot eu ¶
13 years ago