PHP array_map multiple parameters not working How to resolve?

Question

In my code below GST and Amount are printing properly but Discount is not printing the result. Why is Discount not printing? How can I solve this issue?

$GST = Array ( [0] => 18 );
$Amount = Array ( [0] => 25000 );
$Discount = Array ( [0] => 10 );
array_map( 
    function($GST, $Amount, $Discount){ 
        echo ' GST: '.$GST.' Amount: '.$Amount.' Discount: '.$Discount.'<br>';
        echo 'Discount: '.(($Amount * $Discount) / 100).' Amount After Discount: '.($Amount - (($Amount * $Discount) / 100)).'<br>';
        echo 'GST: '.(($Amount - (($Amount * $Discount) / 100)) * $GST / 100).'<br>';
        //return ($Amount - (($Amount * $Discount) / 100)) * $GST / 100; 
    }, 
    !is_array($GST) ? [] : $GST, 
    !is_array($Amount) ? [] : $Amount, 
    !is_array($Discount) ? [] : $Discount 
)

Is that how you defined your arrays? That should throw parse errors. Btw, I tested your code and it works (after changing how you define the arrays). Here's a demo: 3v4l.org/SqgJO — M. Eriksson
– M. Eriksson, Commented Dec 22, 2018 at 11:29

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

A matter of redefining the arrays and you should be on your way of success. Code provided by user Magnus Eriksson.

$GST      = Array (18);
$Amount   = Array (25000);
$Discount = Array (10);
array_map( 
    function($GST, $Amount, $Discount){ 
        var_dump($GST, $Amount, $Discount);
        echo PHP_EOL;
        echo 'GST: '.$GST.' Amount: '.$Amount.' Discount: '.$Discount.PHP_EOL;
        echo 'Discount: '.(($Amount * $Discount) / 100).' Amount After Discount: '.($Amount - (($Amount * $Discount) / 100)).PHP_EOL;
        echo 'GST: '.(($Amount - (($Amount * $Discount) / 100)) * $GST / 100).PHP_EOL;
        //return ($Amount - (($Amount * $Discount) / 100)) * $GST / 100; 
    }, 
    !is_array($GST) ? [] : $GST, 
    !is_array($Amount) ? [] : $Amount, 
    !is_array($Discount) ? [] : $Discount 
);

Output:

int(18)

int(25000)

int(10)

GST: 18 Amount: 25000 Discount: 10

Discount: 2500 Amount After Discount: 22500

GST: 4050

edited Jun 20, 2020 at 9:12

CommunityBot

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answered Dec 22, 2018 at 11:43

ZF007

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3 Comments

M. Eriksson Over a year ago

You could at least give me a shout out if you're going to copy/paste my demo? :-p

ZF007 Over a year ago

When your comment was posted I wasn't finished yet pasting the code. As you see you are referenced;-) Also submitted an edit for the question itself to make it readable.

M. Eriksson Over a year ago

No worries. :-)

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