PHP - Check if values in one array exist in another array multi-dimensional array

Question

I have the following two arrays.

This is a flat array (string: $second_names):

Array ( [0] => Cars [3] => Bikes [8] => Trucks ) //$second_names

I have this multidimensional array - (string: $premiumCatArraySets):

Array
(
    [0] => Array
        (
            [primary-category] => Automobiles
            [secondary-category] => Cars
            [tertiary-category] => Fiat Punto
        )
[1] => Array
    (
        [primary-category] => Automobiles
        [secondary-category] => Cars
        [tertiary-category] => BMW
    )

[2] => Array
    (
        [primary-category] => Automobiles
        [secondary-category] => Bikes
        [tertiary-category] => Honda
    )

[4] => Array
    (
        [primary-category] => Automobiles
        [secondary-category] => Trucks
        [tertiary-category] => Iveco
    )

[6] => Array
    (
        [primary-category] => Automobiles
        [secondary-category] => Cars
        [tertiary-category] => Mercedes
    )

[9] => Array
    (
        [primary-category] => Automobiles
        [secondary-category] => Cars
        [tertiary-category] => Toyota
    )

I am trying to use in_array to see whether the values in the flat array exist and output the brand of the car.

This is what I tried

foreach ($second_names as $second_name) {//Vechile type e.g. car, truck, bike
    if(in_array($second_name, $premiumCatArraySets)){
        echo '<h2>'.$second_name.'</h2>';
        foreach ($third_names as $third_name) {// e.g. Fiat, BMW, Toyota
            echo $third_name.'<br/>';
        }
    }
}

The line for if(in_array($second_name, $premiumCatArraySets)){ doesn't seem to be displaying anything.

Tibin Paul · Accepted Answer · 2016-06-18 15:42:49Z

2

If my understanding is correct, you have to get the vehicle brand from the second array for each vehicles in the first array. You could do something like below. This is a basic script.

<?php

$vehicles = ['Cars', 'Bikes', 'Trucks'];

$details = [
    [
        'primary-category' => 'Automobiles',
        'secondary-category' => 'Cars',
        'tertiary-category' => 'BMW'
    ],
    [
        'primary-category' => 'Automobiles',
        'secondary-category' => 'Trucks',
        'tertiary-category' => 'Benz'
    ]
];

foreach ($vehicles as $vehicle) {
    foreach ($details as $detail) {
        if ($vehicle == $detail['secondary-category']) {
            echo $detail['tertiary-category'];
            break;
        }
    }
}

?>

answered Jun 18, 2016 at 15:42

Tibin Paul

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7 Comments

user6043723 Over a year ago

Thanks. Its telling me PHP Fatal error: Function name must be a string for if ($vehicle == $detail['secondary-category']) {

Tibin Paul Over a year ago

You tried executing the same script in my answer? Works charm for me!

user6043723 Over a year ago

Yeah, I did to try it on a small scale.

$secondary_names = array('Cars', 'Bikes', 'Trucks');  $details = array(     0 => array(         'primary-category' => 'Automobiles',         'secondary-category' => 'Cars',         'tertiary-category' => 'BMW',     ),     1 => array(         'primary-category' => 'Automobiles',         'secondary-category' => 'Trucks',         'tertiary-category' => 'Benz',     ) );

Tibin Paul Over a year ago

Copy and paste the entire script causing error here. I will take a look.

user6043723 Over a year ago

Ok. I guess I managed. I used circular brackets instead of square brackets in my script. Because I used find and replace function :-)

|

zakhefron · Accepted Answer · 2016-06-18 16:10:42Z

1

Try

$output = [];
foreach($premiumCatArraySets as $key => $value){    
    if(in_array($value["secondary-category"],$second_names)){
        if(!isset($output[$value["secondary-category"]])){
            $output[$value["secondary-category"]]  = [];
        }        
        $output[$value["secondary-category"]][] = $value["tertiary-category"];
    }
}
foreach($output as $key => $value){ 
    echo '<h2>'.$key."</h2>";
        echo implode(", ",$value)."<br/>";
}

Output

Cars    
Fiat Punto, BMW, Mercedes, Toyota

Bikes    
Honda

Trucks    
Iveco

Refer : Demo

edited Jun 18, 2016 at 16:10

answered Jun 18, 2016 at 16:02

zakhefron

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Comments

RomanPerekhrest · Accepted Answer · 2016-06-18 16:32:52Z

1

The solution using call_user_func_array, array_merge_recursive, array_keys, array_flip, array_intersect_key and implode functions:

// grouping each category preserving the position of each item
$groups = call_user_func_array('array_merge_recursive', $premiumCatArraySets);
foreach ($second_names as $name) {
    $indexes = array_flip(array_keys($groups['secondary-category'], $name));
    echo '<h2>'.$name.'</h2>';
    echo implode(", ", array_intersect_key($groups['tertiary-category'], $indexes)) .'<br/>';
}

The output:

<h2>Cars</h2>Fiat Punto, BMW, Mercedes, Toyota<br/><h2>Bikes</h2>Honda<br/><h2>Trucks</h2>Iveco<br/>

answered Jun 18, 2016 at 16:32

RomanPerekhrest

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