合併多陣列成字符串

Question

我沒有數組的指定數目，但他們看起來像這樣：

array(("john","alex","tyler"),("1","2","3"),("brown","yellow","green")); 

例有3個個子陣列，但問題是這個數字可以改變。

作爲最終的輸出，我需要在這個例子中，3個字符串的數組。

array("john,1,brown","alex,2,yellow","tyler,3,green"); 

我試過在函數中構建，仍然沒有令人滿意的解決方案。

Answer 1

使用call_user_func_array，array_map和array_merge函數的溶液：

$arr = [["john","alex","tyler"],["1","2","3"],["brown","yellow","green"]]; 

$groups = call_user_func_array("array_map", array_merge([null], $arr)); 
$result = array_map(function ($v) { 
    return implode(",", $v); 
}, $groups); 

print_r($result); 

輸出：

Array 
(
    [0] => john,1,brown 
    [1] => alex,2,yellow 
    [2] => tyler,3,green 
) 

http://php.net/manual/en/function.call-user-func-array.php

Answer 2

在這裏，我們通過將陣列中的行成列改變陣列的值。然後用內爆逗號（,）實施例每個陣列：array[1][0]將變得array[0][1]等

PHP code demo

<?php 
$array=array(
     array("john","alex","tyler"), 
     array("1","2","3"), 
     array("brown","yellow","green") 
); 
$result=array(); 
for($x=0;$x<count($array);$x++) 
{ 
    for($y=0;$y<count($array[$x]);$y++) 
    { 
     $result[$x][$y]=$array[$y][$x];//changing array values 
    } 
} 
foreach($result as $key => $value) 
{ 
    $result[$key]= implode(",", $value);//combining array values on comma(,) 
} 
print_r($result); 

輸出：

Array 
(
    [0] => john,1,brown 
    [1] => alex,2,yellow 
    [2] => tyler,3,green 
) 

Answer 3

使用 argument unpacking（PHP 5.6+）

簡單的方法

<?php 

$array = array(array("john","alex","tyler"),array("1","2","3"),array("brown","yellow","green")); 

$result = array_map(function(...$elements) { return implode(",", $elements); }, ...$array); 

print_r($result); 

結果與其他答覆相同。

---

這裏是在稍微詳細回事：

array_map(/* anonymomous function */, ...$array); 

...$array採用嵌套數組和unpackes它，就像你會打電話

array_map(/* anonymomous function */, $array[0], $array[1], ... $array[n]) 

array_map可能要經過多次數組並將給定的可調用對象應用於每一輪。

雖然匿名功能更多或更少的不逆

function(...$elements) { return implode(",", $elements); } 

...$elements需要的參數的任意的量，並把它們成一個陣列，然後將其加入到一個字符串。

Answer 4

@ ultradurable3這也可以做array_column（）在這裏你不用擔心子陣列的數量，試圖象下面這樣：

<?php 
$array = array(array("john","alex","tyler"), array("1","2","3"), array("brown","yellow","green")); 
$finalArr = array(implode(",", array_column($array, 0)), implode(",", array_column($array, 1)), implode(",", array_column($array, 2))); 
echo "<pre>"; 
print_r($finalArr);