CODEWITHSUNDEEP
phparrays
user1174265
user1174265

Reputation: 13

Merging arrays within an array, preserving numeric index

Array_merge and array_merge_recursive are not working as desired, creating more indexes instead of pushing the arrays together and retaining the index number. See below for input/desired output:

Array (
    [0] => array(
        [0] => "string1",
        [1] => "string2",
        [2] => "string3"
    ),
    [1] => array(
        [0] => "string4",
        [1] => "string5",
        [2] => "string6"
    ),
    [2] => array(
        [0] => "string7",
        [1] => "string8",
        [2] => "string9"
    )
)

Desired Output:

Array (
    [0] => array("string1","string4","string7"),
    [1] => array("string2","string5","string8"),
    [2] => array("string3","string6","string9")

)

EDIT:

Perhaps not the best example; I want to achieve the same results but with an unequal number of keys in each nested array. See below for a better example:

<?php
$array = Array (
[0] => array(
    [0] => "string1",
    [1] => "string2",
    [2] => "string3"
    ),
[1] => array(
    [0] => "string4",
    [1] => "string5",
    [2] => "string6"
    ),
[2] => array(
    [0] => "string7",
    [1] => "string8",
    [2] => "string9"
    ),
[3] => array(
    [0] => "string10",
    [1] => "string11",
    [2] => "string12"
    )
);

$output=array();
    for($0=0;$j<count($array[0]);$j++){
        $output[$j] = array();
    }

for($i=0;$i<count($array);$i++){
    for($0=0;$j<count($array[0]);$j++){
        $output[$j] = array_push($output[$j],$column_values[$i][$j]);
    }
}


?>

But when I do this, I get the correct number of keys in my $output array, but they all contain a bool(false). Any help?

This is the desired output:

Array (
    [0] => array("string1","string4","string7","string10"),
    [1] => array("string2","string5","string8","string11"),
    [2] => array("string3","string6","string9","string12")
)

Upvotes: 0

Views: 130

Answers (3)

user1174265
user1174265

Reputation: 13

Got it. Last loop should simply array_push($output[$j],$column_values[$i][$j]); instead of trying to set the variable $output[$j] = array_push(Yadda,yadda).

Upvotes: 0

HamZa
HamZa

Reputation: 14931

This is for your 'second' situation:

<?php

    $array = array(array("string1","string2","string3"),array("string4","string5","string6"),array("string7","string8","string9"),array("string10","string11","string12"));
    $output=array();

    for($i=0;$i<count($array[0]);$i++){
        for($j=0;$j<=count($array[0]);$j++){
            $output[$i][$j] = $array[$j][$i];
        }
    }
    print_r($output);
?>

Upvotes: 0

HamZa
HamZa

Reputation: 14931

This is to make an array just for this structure of array, so you may change the code depanding on your needs ...

<pre>
<?php
    $array = array(array("string1","string2","string3"),array("string4","string5","string6"),array("string7","string8","string9"));
    $output=array();
    for($i=0;$i<count($array[0]);$i++){
        for($j=0;$j<count($array[0]);$j++){
            $output[$i][$j] = $array[$j][$i];
        }
    }

    print_r($output);
?>
</pre>

Upvotes: 1

Related Questions