php parse multi dimensional array

Question

I have a simple 2D array

    Array
(
        [0] => Array
                (
                        [0] => 7
                )

        [1] => Array
                (
                        [0] => 7
                )

        [2] => Array
                (
                )
)

lets say this is called $myArray when i try parsing it by

$i = 0;
while( $i < count($myArray) ){
    $val = $myArray[$i][0];
    echo $val;
    $i++;
}

i get an error Undefined offset: 0

can anyone lend a hand please

Not all the sub-arrays have the index `0`. You need to check if the index `0` is set before trying to access it: `if (isset($myArray[$i][0])) { ... }`. — Amal Murali, Apr 26 '14 at 02:33

score 1 · Accepted Answer · answered Apr 26 '14 at 02:35

1

Try with:

$i = 0;
while( $i < count($myArray) ){
    $val = current($myArray[$i]);
    echo $val;
    $i++;
}

answered Apr 26 '14 at 02:35

hsz

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score 1 · Answer 2 · answered Apr 26 '14 at 03:22

Basically you're making assumptions about the shape of you're array. Assumptions can be dangerous.

If you give me an array, I can't just assume that it has an index 0. I would need to test for it first:

<?php echo isset($myArray[$i][0]) ? $myArray[$i][0] : ''; ?>

Checking with isset() is very handy.

php parse multi dimensional array

2 Answers2