PHP array index issues

Question

For example, i have 2 arrays,

$array_1 = array('100','250','300','50');
$array_2 = array('a','b','c','d');

next step : i'll sort array 1 and pass 2 arrays into a function, for example the function will return values greater than 100 .

Note: Sorting based on the value is important.(descending order).

Like: array which we are passing

rsort($array_1);
$return = parse($array_1,$array_2);

echo "<pre>";
print_r($return);

function parse(array $arr1,array $arr2){

    $retArr1 = array();
    $retArr2 = array();
    foreach($arr1 as $k=>$value){
        if($value > 100){
            $retArr1[] = $value; 
            $retArr2[] = $arr2[$k];

        }
    }

    return array($retArr1,$retArr2);

}

Output is coming like

Array
(
    [0] => Array
        (
            [0] => 300
            [1] => 250
        )

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

)

But i want like

Array
(
    [0] => Array
        (
            [0] => 300
            [1] => 250
        )

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

)

In your if, you can add something like this $retArr1[] = $value; $retArr2[] = $arr2[$k]; (don't forget to initalize these empty arrays before the loop) and at the end return array($retArr1,$retArr2); — jquiaios
– jquiaios, Commented Jul 18, 2016 at 11:40
Slightly unrelated. Doesn't this throw a fatal error? $array_1 = rsort(array('100','250','300','50'));. Array sort functions operate by reference and you can only pass in variables. — Darragh Enright
– Darragh Enright, Commented Jul 18, 2016 at 11:44
If your two arrays are related, then don't store them as two separate variables. Here, it looks like you can just use array_combine to map them together. — iainn
– iainn, Commented Jul 18, 2016 at 11:46
It actually looks like you want to relate the array of characters to the unsorted array of values. So you should filter first, and then rsort() the array that is returned from your parse() function. — Darragh Enright
– Darragh Enright, Commented Jul 18, 2016 at 12:15

splash58 · Accepted Answer · 2016-07-18 12:18:56Z

1

// sort both arrays
array_multisort($array_1, SORT_DESC, $array_2);

// Take items from array while values of the 1st array > 100
$i = 0;
$res = [];
while ($i < count($array_1) and $array_1[$i] > 100) {
   $res[0][] = $array_1[$i];
   $res[1][] = $array_2[$i++];
}   
print_r($res);

demo

answered Jul 18, 2016 at 12:18

splash58

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Comments

Poiz · Accepted Answer · 2016-07-18 11:54:53Z

0

You can create some Array Variables within your parse Function use them inside your foreach Loop to build up the data you wish to extract from the 2 Arrays passed as Arguments to the Function. The code below illustrates how:

    <?php

        $array_1 = array('100','250','300','50');
        $array_2 = array('a','b','c','d');


        function parse(array $arr1,array $arr2) {
            $tmpArr1 = $tmpArr2 = $arrReturn = array();

            foreach ($arr1 as $k => $value) {
                if ($value > 100) {
                    $tmpArr1[] = $value;
                    $tmpArr2[] = $arr2[$k];
                }
            }
            $arrReturn['arr1'] = $tmpArr1;
            $arrReturn['arr2'] = $tmpArr2;
            return $arrReturn;
        }


        $return = parse($array_1, $array_2);
        var_dump($return);

        // DISPLAYS:            
        array (size=2)
          'arr1' => 
            array (size=2)
              0 => string '250' (length=3)
              1 => string '300' (length=3)
          'arr2' => 
            array (size=2)
              0 => string 'b' (length=1)
              1 => string 'c' (length=1)

USING ARRAYS WITH NUMERIC INDICES

    <?php

        $array_1 = array('100','250','300','50');
        $array_2 = array('a','b','c','d');


        function parse(array $arr1,array $arr2) {
            $tmpArr1 = $tmpArr2 = $arrReturn = array();

            foreach ($arr1 as $k => $value) {
                if ($value > 100) {
                    $tmpArr1[] = $value;
                    $tmpArr2[] = $arr2[$k];
                }
            }
            $arrReturn[] = $tmpArr1;
            $arrReturn[] = $tmpArr2;
            return $arrReturn;
        }

        $return = parse($array_1, $array_2);
        var_dump($return);
        // DISPLAYS:        
        array (size=2)
          0 => 
            array (size=2)
              0 => string '250' (length=3)
              1 => string '300' (length=3)
          1 => 
            array (size=2)
              0 => string 'b' (length=1)
              1 => string 'c' (length=1)

edited Jul 18, 2016 at 11:54

answered Jul 18, 2016 at 11:49

Poiz

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3 Comments

Jasir alwafaa Over a year ago

But first i want pass the array 1 as sorted array ie, rsort($array_1);

Poiz Over a year ago

@alialwafaa Then sort it and pass it... it will still work

Jasir alwafaa Over a year ago

then it returning a and b

Pyton · Accepted Answer · 2016-07-18 12:36:31Z

0

<?php

$array_1 = array('100','250','300','50');
$array_2 = array('a','b','c','d');

$def = array_combine($array_2, $array_1);
asort($def);
$array = array_filter($def, function($val) {
    return $val>100;
});

var_dump($array);
//array(2) {
//    ["b"]=>
//  string(3) "250"
//    ["c"]=>
//  string(3) "300"
//}

Then get keys and values.

answered Jul 18, 2016 at 12:36

Pyton

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Comments

lazyCoder · Accepted Answer · 2016-07-18 13:00:25Z

0

Hey you did only one mistake, try below code which will definitely give your desire output:

<?php
$array_1 = array('100','250','300','50');
$array_2 = array('a','b','c','d');
arsort($array_1);  // make it correct, this was only the mistake done by you.
$return = parse($array_1,$array_2);
function parse(array $arr1,array $arr2){
     $retArr1 = array();
    $retArr2 = array();
    foreach($arr1 as $k=>$value){
        if($value > 100){
            $retArr1[] = $value; 
            $retArr2[] = $arr2[$k];

        }
    }

    return array($retArr1,$retArr2);

}

echo "<pre>";
print_r($return);

?>

answered Jul 18, 2016 at 13:00

lazyCoder

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