(PHP 4 >= 4.0.6, PHP 5, PHP 7)
array_map — 为锟斤拷锟斤拷锟矫匡拷锟皆拷锟接︼拷没氐锟斤拷锟斤拷锟�
array_map()锟斤拷锟斤拷锟斤拷锟斤拷锟介，锟斤拷为 array1 每锟斤拷元锟斤拷应锟斤拷 callback锟斤拷锟斤拷之锟斤拷锟斤拷锟斤拷椤�
callback 锟斤拷锟斤拷锟轿参碉拷锟斤拷锟斤拷锟酵达拷锟斤拷 array_map() 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟竭憋拷锟斤拷一锟斤拷锟斤拷
callback锟截碉拷锟斤拷锟斤拷锟斤拷应锟矫碉拷每锟斤拷锟斤拷锟斤拷锟斤拷锟矫匡拷锟皆拷亍锟�
array1
锟斤拷锟介，锟斤拷锟斤拷锟斤拷锟斤拷 callback 锟斤拷锟斤拷锟斤拷
...
锟斤拷锟斤拷锟叫憋拷每锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 callback 锟斤拷锟斤拷锟斤拷
锟斤拷锟斤拷锟斤拷锟介，锟斤拷锟斤拷 callback 锟斤拷锟斤拷锟斤拷锟斤拷之锟斤拷 array1 锟斤拷锟斤拷锟斤拷元锟截★拷
Example #1 array_map() 锟斤拷锟斤拷
<?php
function cube($n)
{
return($n * $n * $n);
}
$a = array(1, 2, 3, 4, 5);
$b = array_map("cube", $a);
print_r($b);
?>
锟斤拷使锟斤拷 $b 锟斤拷为锟斤拷
Array
(
[0] => 1
[1] => 8
[2] => 27
[3] => 64
[4] => 125
)
Example #2 array_map() 使锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷 (PHP 5.3.0 锟斤拷)
<?php
$func = function($value) {
return $value * 2;
};
print_r(array_map($func, range(1, 5)));
?>
Array
(
[0] => 2
[1] => 4
[2] => 6
[3] => 8
[4] => 10
)
Example #3 array_map()锟斤拷使锟矫革拷锟斤拷锟斤拷锟斤拷锟�
<?php
function show_Spanish($n, $m)
{
return("The number $n is called $m in Spanish");
}
function map_Spanish($n, $m)
{
return(array($n => $m));
}
$a = array(1, 2, 3, 4, 5);
$b = array("uno", "dos", "tres", "cuatro", "cinco");
$c = array_map("show_Spanish", $a, $b);
print_r($c);
$d = array_map("map_Spanish", $a , $b);
print_r($d);
?>
锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�
// printout of $c
Array
(
[0] => The number 1 is called uno in Spanish
[1] => The number 2 is called dos in Spanish
[2] => The number 3 is called tres in Spanish
[3] => The number 4 is called cuatro in Spanish
[4] => The number 5 is called cinco in Spanish
)
// printout of $d
Array
(
[0] => Array
(
[1] => uno
)
[1] => Array
(
[2] => dos
)
[2] => Array
(
[3] => tres
)
[3] => Array
(
[4] => cuatro
)
[4] => Array
(
[5] => cinco
)
)
锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟较碉拷锟斤拷锟斤拷时锟斤拷锟斤拷锟斤拷元锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷同锟斤拷锟斤拷为锟截碉拷锟斤拷锟斤拷锟结并锟叫地达拷锟斤拷锟洁互锟斤拷应锟斤拷元锟截★拷 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷元锟斤拷锟斤拷锟斤拷锟斤拷一锟铰ｏ拷锟斤拷元锟截伙拷锟斤拷展锟斤拷锟角革拷锟斤拷锟介，直锟斤拷锟斤拷锟饺猴拷锟筋长锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷
锟剿猴拷锟斤拷锟叫革拷锟斤拷趣锟斤拷锟矫凤拷锟斤拷锟斤拷锟斤拷 NULL 锟斤拷为锟截碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟狡ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷维锟斤拷锟介（一锟斤拷锟斤拷锟介，锟节诧拷锟斤拷锟斤拷锟斤拷锟介。锟斤拷
Example #4 锟斤拷维锟斤拷锟介：锟斤拷锟斤拷锟斤拷锟介，锟节诧拷锟斤拷锟斤拷锟斤拷锟斤拷
<?php
$a = array(1, 2, 3, 4, 5);
$b = array("one", "two", "three", "four", "five");
$c = array("uno", "dos", "tres", "cuatro", "cinco");
$d = array_map(null, $a, $b, $c);
print_r($d);
?>
锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�
Array
(
[0] => Array
(
[0] => 1
[1] => one
[2] => uno
)
[1] => Array
(
[0] => 2
[1] => two
[2] => dos
)
[2] => Array
(
[0] => 3
[1] => three
[2] => tres
)
[3] => Array
(
[0] => 4
[1] => four
[2] => cuatro
)
[4] => Array
(
[0] => 5
[1] => five
[2] => cinco
)
)
锟斤拷锟斤拷锟斤拷锟斤拷锟揭伙拷锟斤拷锟斤拷椋拷锟斤拷锟絢ey锟斤拷锟结保锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟介，锟斤拷锟斤拷key锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟街碉拷锟斤拷锟叫★拷
Example #5 array_map() 锟斤拷锟斤拷key锟斤拷锟斤拷 string
<?php
$arr = array("stringkey" => "value");
function cb1($a) {
return array ($a);
}
function cb2($a, $b) {
return array ($a, $b);
}
var_dump(array_map("cb1", $arr));
var_dump(array_map("cb2", $arr, $arr));
var_dump(array_map(null, $arr));
var_dump(array_map(null, $arr, $arr));
?>
锟斤拷锟斤拷锟斤拷锟教伙拷锟斤拷锟斤拷锟�
array(1) {
["stringkey"]=>
array(1) {
[0]=>
string(5) "value"
}
}
array(1) {
[0]=>
array(2) {
[0]=>
string(5) "value"
[1]=>
string(5) "value"
}
}
array(1) {
["stringkey"]=>
string(5) "value"
}
array(1) {
[0]=>
array(2) {
[0]=>
string(5) "value"
[1]=>
string(5) "value"
}
}