Foreach 循环中的两个数组

我想使用两个数组生成一个 selectbox,一个包含国家代码,另一个包含国家名称。

这是一个例子:

<?php
$codes = array('tn','us','fr');
$names = array('Tunisia','United States','France');


foreach( $codes as $code and $names as $name ) {
echo '<option value="' . $code . '">' . $name . '</option>';
}
?>

这个方法对我不起作用,有什么建议吗?

323169 次浏览
foreach( $codes as $code and $names as $name ) { }

That is not valid.

You probably want something like this...

foreach( $codes as $index => $code ) {
echo '<option value="' . $code . '">' . $names[$index] . '</option>';
}

Alternatively, it'd be much easier to make the codes the key of your $names array...

$names = array(
'tn' => 'Tunisia',
'us' => 'United States',
...
);

Use array_combine() to fuse the arrays together and iterate over the result.

$countries = array_combine($codes, $names);

foreach operates on only one array at a time.

The way your array is structured, you can array_combine() them into an array of key-value pairs then foreach that single array:

foreach (array_combine($codes, $names) as $code => $name) {
echo '<option value="' . $code . '">' . $name . '</option>';
}

Or as seen in the other answers, you can hardcode an associative array instead.

Use an associative array:

$code_names = array(
'tn' => 'Tunisia',
'us' => 'United States',
'fr' => 'France');


foreach($code_names as $code => $name) {
//...
}

I believe that using an associative array is the most sensible approach as opposed to using array_combine() because once you have an associative array, you can simply use array_keys() or array_values() to get exactly the same array you had before.

Why not just consolidate into a multi-dimensional associative array? Seems like you are going about this wrong:

$codes = array('tn','us','fr');
$names = array('Tunisia','United States','France');

becomes:

$dropdown = array('tn' => 'Tunisia', 'us' => 'United States', 'fr' => 'France');

You can use array_merge to combine two arrays and then iterate over them.

$array1 = array("foo" => "bar");
$array2 = array("hello" => "world");
$both_arrays = array_merge((array)$array1, (array)$array2);
print_r($both_arrays);

array_combine() worked great for me while combining $_POST multiple values from multiple form inputs in an attempt to update products quantities in a shopping cart.

if(isset($_POST['doors'])=== true){
$doors = $_POST['doors'];
}else{$doors = 0;}


if(isset($_POST['windows'])=== true){
$windows = $_POST['windows'];
}else{$windows = 0;}


foreach($doors as $a => $b){

Now you can use $a for each array....

$doors[$a]
$windows[$a]
....
}

I solved a problem like yours by this way:

foreach(array_keys($idarr) as $i) {
echo "Student ID: ".$idarr[$i]."<br />";
echo "Present: ".$presentarr[$i]."<br />";
echo "Reason: ".$reasonarr[$i]."<br />";
echo "Mark: ".$markarr[$i]."<br />";
}

it works for me

$counter = 0;
foreach($codes as $code)
{
$codes_array[$counter]=$code;
$counter++;
}
$counter = 0;
foreach($names as $name)
{
echo $codes_array[$counter]."and".$name;
$counter++;
}

All fully tested

3 ways to create a dynamic dropdown from an array.

This will create a dropdown menu from an array and automatically assign its respective value.

Method #1 (Normal Array)

<?php


$names = array('tn'=>'Tunisia','us'=>'United States','fr'=>'France');


echo '<select name="countries">';


foreach($names AS $let=>$word){
echo '<option value="'.$let.'">'.$word.'</option>';
}
echo '</select>';
 

?>


Method #2 (Normal Array)

<select name="countries">


<?php


$countries = array('tn'=> "Tunisia", "us"=>'United States',"fr"=>'France');
foreach($countries as $select=>$country_name){
echo '<option value="' . $select . '">' . $country_name . '</option>';
}
?>


</select>


Method #3 (Associative Array)

<?php


$my_array = array(
'tn' => 'Tunisia',
'us' => 'United States',
'fr' => 'France'
);


echo '<select name="countries">';
echo '<option value="none">Select...</option>';
foreach ($my_array as $k => $v) {
echo '<option value="' . $k . '">' . $v . '</option>';
}
echo '</select>';
?>

Walk it out...

$codes = array('tn','us','fr');
$names = array('Tunisia','United States','France');
  • PHP 5.3+

    array_walk($codes, function ($code,$key) use ($names) {
    echo '<option value="' . $code . '">' . $names[$key] . '</option>';
    });
    
  • Before PHP 5.3

    array_walk($codes, function ($code,$key,$names){
    echo '<option value="' . $code . '">' . $names[$key] . '</option>';
    },$names);
    
  • or combine

    array_walk(array_combine($codes,$names), function ($name,$code){
    echo '<option value="' . $code . '">' . $name . '</option>';
    })
    
  • in select

    array_walk(array_combine($codes,$names), function ($name,$code){
    @$opts = '<option value="' . $code . '">' . $name . '</option>';
    })
    echo "<select>$opts</select>";
    

demo

You should try this for the putting 2 array in singlr foreach loop Suppose i have 2 Array 1.$item_nm 2.$item_qty

 `<?php $i=1; ?>
<table><tr><td>Sr.No</td> <td>item_nm</td>  <td>item_qty</td>    </tr>


@foreach (array_combine($item_nm, $item_qty) as $item_nm => $item_qty)
<tr>
<td> $i++  </td>
<td>  $item_nm  </td>
<td> $item_qty  </td>
</tr></table>


@endforeach `
<?php


$codes = array ('tn','us','fr');
$names = array ('Tunisia','United States','France');


echo '<table>';


foreach(array_keys($codes) as $i) {


echo '<tr><td>';
echo ($i + 1);
echo '</td><td>';
echo $codes[$i];
echo '</td><td>';
echo $names[$i];
echo '</td></tr>';
}


echo '</table>';


?>

Few arrays can also be iterated like this:

foreach($array1 as $key=>$val){ // Loop though one array
$val2 = $array2[$key]; // Get the values from the other arrays
$val3 = $array3[$key];
$result[] = array( //Save result in third array
'id' => $val,
'quant' => $val2,
'name' => $val3,
);
}

I think that you can do something like:

$codes = array('tn','us','fr');

$names = array('Tunisia','United States','France');

foreach ($codes as $key => $code) {
echo '<option value="' . $code . '">' . $names[$key] . '</option>';
}

It should also work for associative arrays.

I think the simplest way is just to use the for loop this way:

$codes = array('tn','us','fr');
$names = array('Tunisia','United States','France');


for($i = 0; $i < sizeof($codes); $i++){
echo '<option value="' . $codes[$i] . '">' . $names[$i] . '</option>';
}

foreach only works with a single array. To step through multiple arrays, it's better to use the each() function in a while loop:

while(($code = each($codes)) && ($name = each($names))) {
echo '<option value="' . $code['value'] . '">' . $name['value'] . '</option>';
}

each() returns information about the current key and value of the array and increments the internal pointer by one, or returns false if it has reached the end of the array. This code would not be dependent upon the two arrays having identical keys or having the same sort of elements. The loop terminates when one of the two arrays is finished.

This worked for me:

$codes = array('tn', 'us', 'fr');
$names = array('Tunisia', 'United States', 'France');
foreach($codes as $key => $value) {
echo "Code is: " . $codes[$key] . " - " . "and Name: " . $names[$key] . "<br>";
}

Instead of foreach loop, try this (only when your arrays have same length).

$number = COUNT($_POST["codes "]);//count how many arrays available
if($number > 0)
{
for($i=0; $i<$number; $i++)//loop thru each arrays
{
$codes =$_POST['codes'][$i];
$names =$_POST['names'][$i];
//ur code in here
}
}

Your code like this is incorrect as foreach only for single array:

<?php
$codes = array('tn','us','fr');
$names = array('Tunisia','United States','France');


foreach( $codes as $code and $names as $name ) {
echo '<option value="' . $code . '">' . $name . '</option>';
}
?>

Alternative, Change to this:

<?php
$codes = array('tn','us','fr');
$names = array('Tunisia','United States','France');
$count = 0;


foreach($codes as $code) {
echo '<option value="' . $code . '">' . $names[count] . '</option>';
$count++;
}


?>

array_map seems good for this too

$codes = array('tn','us','fr');
$names = array('Tunisia','United States','France');


array_map(function ($code, $name) {
echo '<option value="' . $code . '">' . $name . '</option>';
}, $codes, $names);

Other benefits are:

  • If one array is shorter than the other, the callback receive null values to fill in the gap.

  • You can use more than 2 arrays to iterate through.

This will only work if the both array have same count.I try in laravel, for inserting both array in mysql db

$answer = {"0":"0","1":"1","2":"0","3":"0","4":"1"};
$reason_id = {"0":"17","1":"19","2":"15","3":"19","4":"18"};

        $k= (array)json_decode($answer);
$x =(array)json_decode($reason_id);
$number = COUNT(json_decode($reason_id, true));
if($number > 0)
{
for($i=0; $i<$number; $i++)
{
$val = new ModelName();
$val->reason_id  = $x[$i];
$val->answer  =$k[$i];
$val->save();
}
}

En laravel Livewire

return view('you_name_view', compact('data','data2'));


@foreach ($data as $index => $data )


<li>
<span>\{\{$data}}</span>
<span>\{\{$data2[$index]}}</span>
</li>


@endforeach