How to implement bulk add a fixed string before the value of PHP array using PHP built-in function

For example, the original array is

array('1','2','3','4');

The results I need to get

array('aaa1','aaa2','aaa3','aaa4');

How is the built-in function implemented?

Reply content:

For example, the original array is

array('1','2','3','4');

The results I need to get

array('aaa1','aaa2','aaa3','aaa4');

How is the built-in function implemented?

Array_walk () + Str_pad () can also be implemented:

输出结果为：

array(4) { [0]=> string(4) "aaa1" [1]=> string(4) "aaa2" [2]=> string(4) "aaa3" [3]=> string(4) "aaa4"}

http://ideone.com/nI0IgC

如果不使用闭包效率会更高，但 str_pad() 需要带多个参数，而 array_walk 只能传递一个参数，
所以目前只能这样了。

Well, there is no direct, but there can be a simple way of what the

 !--? php $arr = Array (' 1 ', ' 2 ', ' 3 ', ' 4 ');    $arr = Array_map (create_function (' $item ', ' return ' Aaa$item "; '), $arr); Print_r ($arr);? 
   -->  

     !--? php $a = array (1, 2, 3, 4);    Array_walk ($a, function (& $value, $key, $prefix) {$value = $prefix. $value;}, ' AAA '); Var_dump ($a);   

@ nice red Childe @Fwolf can see this version of my implementation, you can save the str_pad () , completely with Array_walk () implementation, Array_walk () The can not only pass a parameter, but also take a look at the manual.

PHP does not have such built-in functions.

Write a PHP version of yourself, it's not complicated.

