array_reduce
PHP 4 >= 4.0.5, PHP 5, PHP 7, PHP 8
array_reduce - Iteratively reduce the array to a single value using a callback function
Manual
array_reduce(
array$array,
callable$callback,
[mixed$initial = null] ): mixed
array_reduce applies iteratively the callback function to the elements of the array, so as to reduce the array to a single value.
Parameters
- array
-
The input array.
- callback
-
callback( mixed$carry, mixed$item ): mixed
- carry
-
Holds the return value of the previous iteration; in the case of the first iteration it instead holds the value of initial.
- item
-
Holds the value of the current iteration.
- initial
-
If the optional initial is available, it will be used at the beginning of the process, or as a final result in case the array is empty.
Return Values
Returns the resulting value.
If the array is empty and initial is not passed, array_reduce returns null.
Changelog
| Version | Description |
| 8.0.0 | If callback expects a parameter to be passed by reference, this function will now emit an E_WARNING. |