CODEWITHSUNDEEP
phparraysgetindexingnumeric
thom
thom

Reputation: 591

PHP - Get array value with a numeric index

I have an array like:

$array = array('foo' => 'bar', 33 => 'bin', 'lorem' => 'ipsum');
echo native_function($array, 0); // bar
echo native_function($array, 1); // bin
echo native_function($array, 2); // ipsum

So, this native function would return a value based on a numeric index (second arg), ignoring assoc keys, looking for the real position in array.

Are there any native function to do that in PHP or should I write it? Thanks

Upvotes: 59

Views: 152465

Answers (5)

Khaled Developer
Khaled Developer

Reputation: 47

we have native function for do this, its call array_values

array_values returns all the values from the array and indexes the array numerically.

here is how work:

$array = array('foo' => 'bar', 33 => 'bin', 'lorem' => 'ipsum');
echo array_values($array)[0]; // bar
echo array_values($array)[1]; // bin
echo array_values($array)[2]; // ipsum

check PHP Documention for more information.

Upvotes: -1

and.ryx
and.ryx

Reputation: 753

I am proposing my idea about it against any disadvantages array_values( ) function, because I think that is not a direct get function. In this way it have to create a copy of the values numerically indexed array and then access. If PHP does not hide a method that automatically translates an integer in the position of the desired element, maybe a slightly better solution might consist of a function that runs the array with a counter until it leads to the desired position, then return the element reached.

So the work would be optimized for very large array of sizes, since the algorithm would be best performing indices for small, stopping immediately. In the solution highlighted of array_values( ), however, it has to do with a cycle flowing through the whole array, even if, for e.g., I have to access $ array [1].

function array_get_by_index($index, $array) {

    $i=0;
    foreach ($array as $value) {
        if($i==$index) {
            return $value;
        }
        $i++;
    }
    // may be $index exceedes size of $array. In this case NULL is returned.
    return NULL;
}

Upvotes: 8

netcoder
netcoder

Reputation: 67735

Yes, for scalar values, a combination of implode and array_slice will do:

$bar = implode(array_slice($array, 0, 1));
$bin = implode(array_slice($array, 1, 1));
$ipsum = implode(array_slice($array, 2, 1));

Or mix it up with array_values and list (thanks @nikic) so that it works with all types of values:

list($bar) = array_values(array_slice($array, 0, 1));

Upvotes: 6

genesis
genesis

Reputation: 50972

$array = array('foo' => 'bar', 33 => 'bin', 'lorem' => 'ipsum');
$array = array_values($array);
echo $array[0]; //bar
echo $array[1]; //bin
echo $array[2]; //ipsum

Upvotes: 116

John Carter
John Carter

Reputation: 55331

array_values() will do pretty much what you want:

$numeric_indexed_array = array_values($your_array);
// $numeric_indexed_array = array('bar', 'bin', 'ipsum');
print($numeric_indexed_array[0]); // bar

Upvotes: 21

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