打印数组，无任何循环或递归

Question

有没有一种方法可以在没有任何循环或递归的情况下在php中打印数组？

Answer 1

print_r()或var_dump()

Answer 2

You could try print_r($array); or var_dump($array); to display key/value information about the array. This is used mainly for debugging.

Alternatively if you want to display the array to users, you can use implode to stick the elements together with custom "glue", implode(' ',$array); .

Answer 3

print_r是您要寻找的功能。

Answer 4

Depends on what you want.

print_r() prints human-readable information about a variable but var_dump() displays structured information about expressions that includes its type and value.

Answer 5

It depends on your wanted result. You could use several functions for different purposes.

Here are some examples:

You can use print_r for debug output.

<?php
    $a = array ('a' => 'Apfel', 'b' => 'Banane', 'c' => array ('x', 'y', 'z'));
    print_r ($a);
?>

... will produce

Array
(
    [a] => Apfel
    [b] => Banane
    [c] => Array
        (
            [0] => x
            [1] => y
            [2] => z
        )
)

If you need some specific formated result/output you could use array_walk

<?php
$fruits = array("d" => "Zitrone", "a" => "Orange", "b" => "Banane", "c" => "Apfel");

function test_alter(&$item1, $key, $prefix)
{
    $item1 = "$prefix: $item1";
}

function test_print($item2, $key)
{
    echo "$key. $item2<br>\n";
}

array_walk($fruits, 'test_print');

array_walk($fruits, 'test_alter', 'Frucht');

array_walk($fruits, 'test_print');
?>

... will produce

d. Zitrone
a. Orange
b. Banane
c. Apfel

d. Frucht: Zitrone
a. Frucht: Orange
b. Frucht: Banane
c. Frucht: Apfel

An even more generic way might be iterator_apply

<?php
function print_caps(Iterator $iterator) {
    echo strtoupper($iterator->current()) . "\n";
    return TRUE;
}

$it = new ArrayIterator(array("Apples", "Bananas", "Cherries"));
iterator_apply($it, "print_caps", array($it));
?>

... will produce

APPLES
BANANAS
CHERRIES

But in the end... they are all loop through the array internally, of course. There are many other functions (eg array_map ) that might be the right choice for your coding... have a look at the documentation of php and search for array functions .

Answer 6

function num($a,$b){

    if($b<0)
    {
        return false;

    }
    else
    {
        echo $a * $b;

        num($a,--$b);
    }
}

$a=1;
$b=5;