如何获取和更改Laravel中元素数组的值？

Question

我有2数组：

$array_1 = [1,2,3,1,2];

和：

$array_2 = [0,0,0,0,0];

我想改变的$array_2的值，因此它会显示如果在$array_1元素是数字1或2只要。

foreach($array_1 as $item) 
{ 
    if($item = 1 || $iten == 2) 
    { 
     $index = ...;//how to get index of this element 
     $array_2[$index] = 1; //I don't sure this syntax is right 
    } 
} 

输出$array_2应该是这样的：$array_2 = [1,1,0,1,1]

Answer 1

<?php 

// your code goes here 
$array_1 = [1,2,3,1,2]; 

$array_2 = [0,0,0,0,0]; 
$index = 0; 
foreach($array_1 as $item) 
{ 
    if($item == 1 || $item == 2) 
    { 
     //how to get index of this emlement 
     $array_2[$index] = 1; //I don't sure this syntax is right 
     $index++; 
    } 
    else 
    { 
     //do nothing 
     $index++; 
    } 
} 

echo "<pre>"; 
print_r($array_2); 
echo "</pre>"; 

Answer 2

试试这个代码

$array_1 = array(1,2,3,1,2); 
foreach($array_1 as &$item) 
{ 
    if($item = 1 || $item == 2) { 
    $item = 1; 
    } 
} 

echo $array_1; 

Answer 3

我猜你只需要更换其他项目比1,2比0，纠正我，如果我错了。

$array_3 = array(); 

foreach ($array_1 as $key => $item) 
{ 
    if($item == 1 || $item == 2) 
    { 
     $array_3[$key] = $item; 
    } 
    else 
    { 
     $array_3[$key] = 0; 
    } 
} 

Answer 4

下面的PHP代码可能会做你想要什么：

<?php 
$valid = [1, 2]; // allows you to extend a bit later 
$array_1 = [1,2,3,1,2]; 

$array_2 = array_map(function($var) use ($valid) { 
    return in_array($var, $valid) ? 1 : 0; 
}, $array_1); 

print_r($array_2); // [1, 1, 0, 1, 1] 

看看在array_map功能在http://php.net/manual/en/function.array-map.php