Question

Array
(
    [0] => Array
        (
            [0] => 1
        )

    [1] => Array
        (
            [0] => 2
        )

    [2] => Array
        (
            [0] => 3
        )

    [3] => 

    [4] => 

    [5] => 

    [6] => 

    [7] => 

    [8] => 

    [9] => 

    [10] => 

    [11] => 

    [12] => 

    [13] => 

    [14] => 
)

如何使用foreach打印上面的数组？我尝试使用这样的foreach：

$i = 0;

foreach($array as $arr)

{

    echo $arr[$i];

    $i++;

}

但结果是空的。

Answer 1

如果值本身是一个数组（可能是未知长度），那么你也需要遍历它。

foreach( $array as $index => $val ){
    if( is_array( $val ) ){
        foreach( $val as $i => $arr ) echo $arr;
    } else {
        echo $val;
    }
}

Answer 2

您可以使用print_r()，var_dump()或使用foreach()打印 - 但您做错了！

print_r($array); //will print the whole array

var_dump($array); //will print the whole array plus variable type and length

foreach($array as $arr){
    //$arr is the array VALUE!
    if(!is_array($arr)) echo $arr;
        else echo $arr[0];
}

Answer 3

试试这个

foreach ($array as $key => $value) {
    if (is_array($value) && count($value) > 0) {
        foreach ($value as $key1 => $val1) {
            echo $val1;
        }
    } else {
        echo $value;
    }
}

Answer 4

function print_array($array){
    foreach ($array as $value){
        if (is_array($value)){
            print_array($value);
        }
        else{
            echo $value;
        }
    }
}

$array = array('a', 'b', array('c', 'd'));

print_array($array);

Answer 5

如果您不知道叠层阵列的数量，最好的方法是递归：

function print_table($table){
    foreach ($table as $key => $value) {
        if (is_array($value)) {
            print_table($value);
        } else {
            echo "<p> $key -> $value </p>";
        }
    }
}

为例

$fruits = array (
    "fruits"  => array("a" => "orange", "b" => array("a" => "orange", "b" => "banana", "c" => "apple"), "c" => "apple"),
    "numbers" => array(1, 2, 3, 4, 5, 6),
    "holes"   => array("first", 5 => "second", "third")
);

print_table($fruits);

Answer 6

foreach($array as $arr){
    print_r($arr);
}

如何打印这种类型的数组？

6 个答案: