PHP array_walk_recursive uses a custom function to handle every element in an array _php instance

Array_walk_recursive user functions recursively in each member of an array

Basic syntax

BOOL Array_walk_recursive (array & $input, callable $funcname [, mixed $userdata = NULL])

Applies the user-defined function funcname to each cell in an array. This function recursively goes to a deeper array. In the FuncName function, the key name and key value of the array are the parameters of the function.

Parameter introduction:

Parameters	Description
Input	Necessary. The array entered.
FuncName	Necessary. The name of the user-defined function. Typically, the funcname accepts two parameters. The value of the input parameter is the first, and the key name is the second.
UserData	Optional. If an optional parameter userdata is provided, it is passed as the third argument to callback funcname.

Note: If funcname needs to act directly on the values in the array, the first argument to FuncName is specified as a reference. Any changes to these units will also change the original array itself.

return value

Returns TRUE on success or FALSE on failure.

Instance:

<?php
$sweet = Array (
  ' a ' => ' apple ', '
  b ' => ' banana '
);
$fruits = Array (
  ' sweet ' => $sweet,
  ' sour ' => ' lemon '
);
function Test_print ($item, $key) {
  echo $key holds $item <br/>;
}
Array_walk_recursive ($fruits, ' test_print ');

Run Result:

A holds Apple
B holds banana
Sour holds lemon

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