How to print an array within an array in PHP

Question

I have this array that's driving me crazy, how can I print it? Using print_r shows it as a 2D array, but I can't output it with nested for loops, $m_a[0][1] gives nothing, and $m_a[1] returns a Array to string error.

$m_a = array(
        array(20347598, true),
        array(0, true),
        array(1, true),
        array(2, true),
        array(3, true),
        array(4, false),
        array(5, true),
        array(6, false),
        array(7, false),
        array(8, true),
        array(9, false),
        array(100, false),
        array(110, false),
        array(120, false),
        array(550, true),
        array(6100, true),
        array(123450, false),
        array(750250, true),
        array(8320400, true),
        array(92274650, true),
    );

But what if I want to work with each individual array inside? like if I want to work with array(100, false) and just that 1.? O.o — user2644215
– user2644215, Commented Aug 2, 2013 at 2:19
Then you need to loop over the array. See php.net/manual/en/control-structures.for.php and php.net/manual/en/control-structures.foreach.php — Justin Warkentin
– Justin Warkentin, Commented Aug 2, 2013 at 16:07

Codewithcheese · Accepted Answer · 2013-08-02 01:50:22Z

1

Try

var_dump($m_a);

var_dump is a great function to know when learning PHP.

answered Aug 2, 2013 at 1:50

Codewithcheese

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Comments

Jacob · Accepted Answer · 2013-08-02 01:46:03Z

0

how about this

foreach ($m_a as $key) {
   echo $key[0] . " - " . $key[1] . "<br />";
}

answered Aug 2, 2013 at 1:46

Jacob

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Comments

federicot · Accepted Answer · 2013-08-02 01:46:07Z

0

foreach ($m_a as $foo) {
    print_r($foo);
}

If you prefer, instead of print_r($foo) you could do echo "$foo[0], $foo[1] \r\n" to display the values.

answered Aug 2, 2013 at 1:46

federicot

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Comments

Vlad Miller · Accepted Answer · 2013-08-02 01:49:15Z

How do you trying to output $m_a[0][1]?

var_dump($m_a[0][1]);

Works perfectly fine

Vlads-MacBook-Pro:~ vmiller$ php -a
Interactive mode enabled
php > $m_a = array(
php (         array(20347598, true),
php (         array(0, true),
php (         array(1, true),
php (         array(2, true),
php (         array(3, true),
php (         array(4, false),
php (         array(5, true),
php (         array(6, false),
php (         array(7, false),
php (         array(8, true),
php (         array(9, false),
php (         array(100, false),
php (         array(110, false),
php (         array(120, false),
php (         array(550, true),
php (         array(6100, true),
php (         array(123450, false),
php (         array(750250, true),
php (         array(8320400, true),
php (         array(92274650, true),
php (     );
php > var_dump($m_a[0][1]);
bool(true)
php > echo $m_a[0][1];
1php > print $m_a[0][1];
1php >

jh314 · Accepted Answer · 2013-08-02 01:52:39Z

0

You can try this:

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

If you want to print out the inner arrays individually, you can do this:

foreach ($m_a as $arr) {
     foreach($arr as $v) {
          print_r($v."\n");
     }
}

If you really want to use $i and $j:

for ($i = 0; $i < count($m_a); $i++) {
     for ($j = 0; $j < count($m_a[$i]); $j++) {
          print_r($m_a[$i][$j]."\n");
     }
}

edited Aug 2, 2013 at 1:52

answered Aug 2, 2013 at 1:43

jh314

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