problem with arrays

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problem with arrays

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#1 by (0 votes)

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I would like to know why this happens:

$ c [0] = 'a'; $ c [0] [0] = 'b';

so far so good, but if I add

$ c [0] [0] [0] = 'c';

gives the error Fatal error: Can not use string offset as an array in H: \ aNoti \ web \ work \ miniforo \ pb.php on line 3

php

asked by ruben 04.11.2017 в 14:43

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1 answer

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score 0 · Answer 1

Several things:

Your first assignment: $c[0]='a'; creates an array, and adds the value a in the first position.

Let's try:

$c[0]='a';
var_dump($c);

Result:

array(1) {
  [0]=>
  string(1) "a"
}

Instead, your second assignment replaces that value. Let's see:

$c[0]='a';
$c[0][0]='b';
var_dump($c);

Result:

array(1) {
  [0]=>
  string(1) "b"
}

As you can see, you did not add a second value to your array, but you replaced the value of a previously entered.

By doing this: $c[0][0][0]='c'; you have the error :

Uncaught Error: Can not use string offset as an array

What if we see what is really $c[0][0][0] ? Let's see:

    $c[0]='a';
    $c[0][0]='b';
    var_dump($c[0][0][0]);

Resultado:

    string(1) "b"

Then what the error tells you is that $c[0][0][0] is a string, whose value is b and you can not use it as an array, which is what you try ... enter c in a certain position of the array.

Several solutions:

One-dimensional array

    $c[0]='a';
    $c[1]='b';
    $c[2]='c';  
    print_r($c);

Result:

    Array
    (
        [0] => a
        [1] => b
        [2] => c
    )

Note: The construction can also be done in this style:

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

Two-dimensional array

    $c[0][0]='a';
    $c[0][1]='b';
    $c[0][2]='c';  
    print_r($c);

Result:

    Array
    (
        [0] => Array
            (
                [0] => a
                [1] => b
                [2] => c
            )

    )

Three-dimensional array

With each value in a separate array:

$c[0][0][0]='a';
$c[1][0][0]='b';
$c[2][0][0]='c';  
print_r($c);

Result:

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

        )

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

        )

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

        )

)

With the three values in the same array:

    $c[0][0][0]='a';
    $c[0][0][1]='b';
    $c[0][0][2]='c';  
    print_r($c);

Result:

    Array
    (
        [0] => Array
            (
                [0] => Array
                    (
                        [0] => a
                        [1] => b
                        [2] => c
                    )

            )

    )