PHP连接跳过空值的行

I'm trying to concatenate an array, but when PHP comes across an empty array-item, it stops concatenating.

My array looks like this:

Array
(
    [0] => Array
        (
            [0] => Test1
            [1] => Test1
            [2] => 
        )
    [1] => Array
        (
            [0] => Test2
            [1] => Test2
            [2] => 
        )
    [2] => Array
        (
            [0] => Test3
            [1] => Test3
            [2] => Test3
        )
)

The 3th item on the first 2 Array-items are empty. And when I loop over them like this:

$keys = array('uid', 'type', 'some_column', 'other_column');
foreach ($csv as $i => $row) {
    $uid = $row[0] . $row[1] . $row[2];
    array_unshift($row, $uid);
    $csv[$i] = array_combine($keys, $row);
}

I only get Test3Test3Test3 back, instead of the expected

Test1Test1
Test2Test2
Test3Test3Test3

So it looks like PHP is skipping items when concatenating an empty value.
Is this normal PHP behavior? And if so, how can I tackle this?

Try this:

$uid = array();
foreach ($array as $i => $row) {
    $uid[] = $row[0] . $row[1] . $row[2];
}
var_dump($uid);

This outputs:

Array
(
    [0] => Test1Test1
    [1] => Test2Test2
    [2] => Test3Test3Test3
)

You can do something similar to produce a string:

$uid = '';
foreach ($arr as $i => $row) {
    $uid .= $row[0] . $row[1] . $row[2] . "
";
}
echo $uid;

Output:

Test1Test1
Test2Test2
Test3Test3Test3

Try like

$uid = array();
foreach ($array as $i => $row) {
    $uid[] = $row[0] . $row[1] . $row[2];
}
var_dump($uid);

Just you are giving $uid and it is taking it as an type variable and it appends the last occurance of loop into that variable.If you want your desired output you need to declare it as an array before.

To get the expected output

$uid = "";
foreach ($array as $i => $row) {
    $uid .= $row[0] . $row[1] . $row[2] . "
";
}
echo $uid;

I'm sorry, but if that is your desired output, you're overcomplicating things:

$foo = array(
    array("Test1","Test1"),
    array("Test2","Test2"),
    array("Test3","Test3","Test3")
);
echo implode(PHP_EOL,
             //implode all child arrays, by mapping, passes no delimiter
             //behaves as concatenation
             array_map('implode',$foo)
);

Returns:

Test1Test1
Test2Test2
Test3Test3Test3

In your case, you can use bits of this code like so:

$csv = array(array("Test1","Test1",''),array("Test2","Test2",''),array("Test3","Test3","Test3"));
$keys = array('uid', 'type', 'some_column', 'other_column');
foreach($csv as $k => $row)
{
    array_unshift($row,implode('',$row));
    $csv[$k] = array_combine($keys,$row);
}

gives:

Array
(
    [0] => Array
        (
            [uid] => Test1Test1
            [type] => Test1
            [some_column] => Test1
            [other_column] => 
        )

    [1] => Array
        (
            [uid] => Test2Test2
            [type] => Test2
            [some_column] => Test2
            [other_column] => 
        )

    [2] => Array
        (
            [uid] => Test3Test3Test3
            [type] => Test3
            [some_column] => Test3
            [other_column] => Test3
        )

)

You need to use two foreach loop..

Procedure:

1. Initialize your first foreach loop to get the key => value as $key=> $value of each array inside.
2. Then initialize your second loop to $value variable since value inside of this is another array key => value = $innerKey => $innerValue.
3. Then inside your second loop echo $innerValue to display values inside of the secondary array
4. Lastly put an echo '<br/>' inside your first loop to put each secondary array into another newline.`

.

$data = array(
                0 => array(
                    0 => 'Test1',
                    1 => 'Test1',
                    2 => ''
                ),
                1 => array(
                     0 => 'Test2',
                     1 => 'Test2',
                     2 => ''
                ),
                2 => array(
                     0 => 'Test3',
                     1 => 'Test3',
                     2 => 'Test3'
                )
            );

   foreach($data as $key => $value){
       foreach($value as $innerKey => $innerValue){
           echo $innerValue;

       }
       echo '<br/>';

   }

// Output would be..
Test1Test1
Test2Test2
Test3Test3Test3

Code Tested at : PHP Fiddle