array_splice() : Insert array into 2-dimensional array at index [PHP]

Question

I am trying to insert an array into a 2-dimensional array at a specific position. According the manual, i should be able to do this with array_splice(), but it only deletes the contents of my receiving array without insertion.

I want to get an array with all the values (arrays) of $receivingArray plus the new value (array).

What am I doing wrong??

manual info:

array array_splice ( array &$input , int $offset [, int $length [, mixed $replacement = array() ]] )

If length is specified and is zero, no elements will be removed. If replacement is just one element it is not necessary to put array() around > it, unless the element is an array itself, an object or NULL.

input:

$newArray = array_splice($receivingArray, 0, 0, array($value));

result: $newArray is an empty array

input :

$newArray = array_splice($receivingArray, 1, 0, array($value));

result: $newArray is an empty array

this input:

print_r($receivingArray);
print_r(array($value));
$newArray = array_splice($receivingArray, 1, 1, array($value));
print_r($newArray);

gives: (interestingly)

Array
(
    [0] => Array
        (
            [id] => 1
            [primaryID] => 0
            [category_id] => 1
            [title] => sports
            [description] => 
            [selected] => 
            [level] => 0
        )

    [1] => Array
        (
            [id] => 4
            [primaryID] => 0
            [category_id] => 0
            [title] => programming
            [description] => 
            [selected] => 
            [level] => 0
        )

)
Array
(
    [0] => Array
        (
            [id] => 2
            [primaryID] => 1
            [category_id] => 1
            [title] => soccer
            [description] => 
            [selected] => 
            [level] => 1
        )

)
Array
(
    [0] => Array
        (
            [id] => 4
            [primaryID] => 0
            [category_id] => 0
            [title] => programming
            [description] => 
            [selected] => 
            [level] => 0
        )

)

First of all don't give this much array output . confusing. Just show initial $receivingArray. what you tried(code) and what your expected output. not whole array just a part of it which make sense to all of us. — Death-is-the-real-truth
– Death-is-the-real-truth, Commented May 29, 2015 at 2:37

FuzzyTree · Accepted Answer · 2015-05-29 02:38:52Z

4

From the docs for array_splice()

Return Values

Returns the array consisting of the extracted elements.

$newArray = array_splice($receivingArray, 0, 0, array($value));

array_splice modifies its input, so the results you're looking for are in $receivingArray and not $newArray

answered May 29, 2015 at 2:38

FuzzyTree

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Comments

santi-elus · Accepted Answer · 2015-05-29 03:02:12Z

I missed the fact that array_slice() doesn't actually return its output, but rather acts upon the receiving array itself, which is passed by reference. I didn't notice that there is an ammpersand in front of the first parameter in the manual specification.

this input:

print_r($receivingArray);
print_r(array($value));
array_splice($receivingArray, 0, 0, array($value));
print_r($receivingArray);

gives the correct result:

Array 
(
    [0] => Array
        (
            [id] => 1
            [primaryID] => 0
            [category_id] => 1
            [title] => sports
            [description] => 
            [selected] => 
            [level] => 0
        )

    [1] => Array
        (
            [id] => 4
            [primaryID] => 0
            [category_id] => 0
            [title] => programming
            [description] => 
            [selected] => 
            [level] => 0
        )

)
Array
(
    [0] => Array
        (
            [id] => 2
            [primaryID] => 1 
            [category_id] => 1
            [title] => soccer
            [description] => 
            [selected] => 
            [level] => 1
        )

)
Array
(
    [0] => Array
        (
            [id] => 1
            [primaryID] => 0
            [category_id] => 1
            [title] => sports
            [description] => 
            [selected] => 
            [level] => 0
        )

    [1] => Array
        (
            [id] => 2
            [primaryID] => 1
            [category_id] => 1
            [title] => soccer
            [description] => 
            [selected] => 
            [level] => 1
        )

    [2] => Array
        (
            [id] => 4
            [primaryID] => 0
            [category_id] => 0
            [title] => programming
            [description] => 
            [selected] => 
            [level] => 0
        )

)

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