Questions about array_walk

Question about array_walk & lt ;? Php $ fruits & nbsp ;=& nbsp; array ("d" = & gt; "lemon", "a" = & gt; "apple ", "B" = & gt; "banana", "c" = & gt; "orange"); function & nbsp; test_alter (& amp; $ item1, $ questions about array_walk
$ Fruits = array ("d" => "lemon", "a" => "apple", "B" => "banana ", "c" => "orange ");
Function test_alter (& $ item1, $ key, $ prefix)
{
$ Item1 = "$ prefix: $ item1 ";
}
Function test_print ($ item2, $ key)
{
Echo "$ key. $ item2
\ N ";
}
Echo "Before... \ n ";
Array_walk ($ fruits, 'Test _ print ');
Array_walk ($ fruits, 'Test _ alter ', 'fruit ');
Echo "... and after: \ n ";
Array_walk ($ fruits, 'Test _ print ');
?>
The traversal expression of the last few lines of this code cannot be understood. please help me analyze it carefully for me to understand it ~ Share: More