Sum substring values from an array of delimited strings

Question

I have two cookies and their values like this:

foreach ($_COOKIE as $key => $val) {
    $piece = explode(",", $val);
    $t_cost = array($piece[3]);
    print_r($t_cost); //It prints Array ( [0] => 11 ) Array ( [0] => 11 )
    echo $total_cost = array_sum($t_cost);
}

But it prints only one value. How can I add the both values to sum them?

Push each value ($t_cost) in a new array then apply the array--sum on that array? — ka_lin
– ka_lin, Commented Oct 6, 2017 at 12:07
This question doesn't contain a clear minimal reproducible example. — mickmackusa
– mickmackusa ♦, Commented Jan 14, 2024 at 8:55

AZinkey · Accepted Answer · 2017-10-06 12:12:30Z

2

I think you don't need array_sum, just use += operator it will save a bit of memory

$t_cost = 0;
foreach($_COOKIE as $key=>$val) {
    $piece = explode(",", $val);
    $t_cost += $piece[3];
}
echo $t_cost;

answered Oct 6, 2017 at 12:12

AZinkey

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2 Comments

user1928251 Over a year ago

How does that work because it works can you explain me?

mickmackusa Over a year ago

$key doesn't appear to be useful.

Jeff Mattson · Accepted Answer · 2017-10-06 12:15:24Z

1

$total = 0;
foreach($_COOKIE as $key=>$val) {
      $piece = explode(",", $val);
      $t_cost = trim(str_replace('$', '', array($piece[3]));
      $total += (float)$t_cost;
      echo "The total cost: $".$total;
}

edited Oct 6, 2017 at 12:15

answered Oct 6, 2017 at 12:09

Jeff Mattson

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1 Comment

mickmackusa Over a year ago

This answer is missing its educational explanation.

Prakash Pazhanisamy · Accepted Answer · 2017-10-06 12:31:45Z

1

There is no need of array_sum actually.

// the array where all piece[3] values are stored
$t_cost = array();

// loop through array
// just foreach($_COOKIE as $val) is enough
foreach($_COOKIE as $key=>$val) {

    // split by comma
    $piece = explode(",", $val);

    // add to array
    $t_cost[] = $piece[3];

}
// sum up  
$total_cost = array_sum($t_cost);

or just

$total = 0;
foreach($_COOKIE as $key=>$val) {
        $piece = explode(",", $val);  
        $total += $piece[3];
}
echo $total;

edited Oct 6, 2017 at 12:31

Prakash Pazhanisamy

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answered Oct 6, 2017 at 12:08

Akshay Hegde

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2 Comments

mickmackusa Over a year ago

$key doesn't appear to be useful.

Akshay Hegde Over a year ago

@mickmackusa: You're right in current context its not needed, as you can see OP posted problem with foreach ..., I just showed one of possible methods to get required output.

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