Trying to loop inside array

Question

I am working on a PHP file.

There is a string array that I receive via POST:

$str = (45,42,12,);

First I remove the last comma:

$str = substr($string_temas,0,-1);

I get then

$str = (45,42,12);

To check it, I echoed it:

echo "str value=".$str;

And I get as echo result:

str value=45,42,12

Then I try to loop for each item, like this:

foreach ($str as $value) {

        }

but I am getting an error:

Invalid argument supplied for foreach() in .....line (foreach ($str as $value) {

What am I doing wrong?

if you get "45,42,12," in your POST (with the trailing ",") you should also fix what you are sending. — Jeff
– Jeff, Commented Sep 10, 2018 at 9:38

Bhavin Solanki · Accepted Answer · 2018-09-10 09:36:47Z

6

If your final string is 45,42,12 then you can use explode function of PHP

$finalArray = explode(",",$str);

foreach ($finalArray as $value) {

}

edited Sep 10, 2018 at 9:36

answered Sep 10, 2018 at 9:32

Bhavin Solanki

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2 Comments

Rob Over a year ago

This is the correct solution, instead of using string to foreach you should use an Array.

Bhavin Solanki Over a year ago

@mvasco Please accepts the correct answer because it's useful for other users in future.

Milan Chheda · Accepted Answer · 2018-09-10 09:32:59Z

1

Before looping, you need to have an array. You probably want to explode the string:

$array = explode(',', $str);
foreach ($array as $value) {
 // code here...
}

answered Sep 10, 2018 at 9:32

Milan Chheda

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Comments

Josep Widtantio · Accepted Answer · 2018-09-10 09:33:01Z

1

because you loop string variable. To convert string to array, you can use explode function.

foreach (explode(",", $str) as $value) {
    ...
}

http://php.net/manual/en/function.explode.php https://www.w3schools.com/php/func_string_explode.asp

answered Sep 10, 2018 at 9:33

Josep Widtantio

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Comments

whitelined · Accepted Answer · 2018-09-10 09:34:14Z

1

You'll only receive a string from request data, not an array. Use explode to split comma separated data into an array

$arr=explode(',',$str);

Then you can loop through this.

answered Sep 10, 2018 at 9:34

whitelined

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