Filter string from inside an array

Question

I tried this:-

function sum_array($arr_sum){   
        $string= "";

        $length= count($arr_sum);
        $sum= NULL;
        if(is_string($arr_sum)){
                echo "You cannot use string";
            }else{      
                for($i=0; $i<$length; $i++){
                $sum = $sum + $arr_sum[$i];
            }
                echo " The Sum is ". $sum;
                }
    }
    $array_summation=["string",12.6,25.2,10,12];
    sum_array($array_summation);

I want to know what should i do if i want only integer or float value inside an array, and if string come inside array it gives error that no string wanted or something like that

You should accept an answer

Mike
– Mike

2016-08-24 04:54:00 +00:00
Commented Aug 24, 2016 at 4:54 — Mike
– Mike, Commented Aug 24, 2016 at 4:54

jitendrapurohit · Accepted Answer · 2016-08-24 05:29:33Z

1

Use array_map to get the type of each value present in the array -

$type = array_map('gettype', $array_summation);
if (!empty($type) && in_array('string', $type) {
  echo "You can't use string.";
}

edited Aug 24, 2016 at 5:29

answered Aug 24, 2016 at 4:39

jitendrapurohit

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4 Comments

Mughal Gee Over a year ago

Thanks Worked for me

Mike Over a year ago

This only checks the type of the first element in the array and ignores the rest. Also you're also missing quotes around 'gettype'.

Mike Over a year ago

@jitendrapurohit What about if someone has an object or another array as a value? That's why I'm using return is_float($n) || is_int($n); in my answer.

jitendrapurohit Over a year ago

OP has given an example for an array, and this works for validating it.

Md. Sahadat Hossain · Accepted Answer · 2016-08-24 04:39:22Z

0

Try this

function sum_array($arr_sum){   
        $sum = 0;
        foreach($arr_sum as $value){
            if(!is_numeric($value)){
                echo 'Array Contain non numeric data';
                exit;
            }
            $sum += $value;
        }
        echo 'The sum is '.$sum;
    }

    $array_summation=["string",12.6,25.2,10,12];
    sum_array($array_summation);

answered Aug 24, 2016 at 4:39

Md. Sahadat Hossain

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1 Comment

Mughal Gee Over a year ago

Thanks Worked for me

Mike · Accepted Answer · 2016-08-24 05:16:02Z

0

PHP has a built-in array_sum function, which ignores non-numeric strings.

$arr = [1,2,'3','apple'];
var_dump(array_sum($arr)); // int(6)

Or if you really need them to produce an error you can use array_map:

function sum_array($arr) {
    if (array_sum(array_map('is_numeric', $arr)) !== count($arr)) {
        echo "You cannot use string";
        return;
    }
    echo array_sum($arr);
}
sum_array([1,2,'3','apple']); // You cannot use string
sum_array([1,2,'3','5.2']); // 11.2

Or if you want to make sure that all values in the array are either floats or integers, and not numeric strings, you can do:

function is_non_string_number($n) {
    return is_float($n) || is_int($n);
}
function sum_array($arr) {
    if (array_sum(array_map('is_non_string_number', $arr)) !== count($arr)) {
        echo "You cannot use string";
        return;
    }
    echo array_sum($arr);
}
sum_array([1,2,'3','apple']); // You cannot use string
sum_array([1,2,'3','5.2']); // You cannot use string
sum_array([1,2,3]); // 6

edited Aug 24, 2016 at 5:16

answered Aug 24, 2016 at 4:45

Mike

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4 Comments

Mughal Gee Over a year ago

Thanks Worked for me

Mike Over a year ago

Note: This will allow numeric strings, such as "3.5". If you want to disallow that and only allow integers or floats, let me know and I'll update the answer.

Mughal Gee Over a year ago

Yes please specify that case also

Mike Over a year ago

@MughalGee Updated.

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