The value becomes blank when loop the array - php

Question

I get the data from API and the structure like this
[
{keyword: ["123","456","789"] , name :"hello" },
{keyword: ["abc","def","ghi"] , name :"bye" },
{keyword: ["987","654","321"] , name :"hello" }
]
I decode it and use for loop to process the data
for($i = 0, $l = count($result); $i < $l; ++$i) {
echo join(',' , $result[0]->keyword);
}
and i got
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
the i try to dump the array in the loop , the result is
array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(3) { [0]=> string(0) "" [1]=> string(0) "" [2]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" } array(2) { [0]=> string(0) "" [1]=> string(0) "" }
But I can use the data out of the loop
echo join(',' , $result[0]->keyword);
//123,456,789
var_dump($result[0]->keyword);
//array(3) { [0]=> string(6) "XXXXXXX" [1]=> string(9) "XXXXXXXX" [2]=> string(12) "XXXXXXXXXX" }
All other data in the data can be used and no encoding problem, why only this array's content being blank?

Answer 1

You can use a foreach loop here to achieve the desired result. Try this:
foreach ( $result as $array ) {
echo implode(",", $array->keyword);
}
Note: most people will use implode, join is simply an alias for implode. It's fine to use either in your code.

Answer 2

Check this code, may be fix your problem
<?php
$str = '[{"keyword": ["123","456","789"] , "name" :"hello" },
{"keyword": ["abc","def","ghi"] , "name" :"bye" },
{"keyword": ["987","654","321"] , "name" :"hello" }]';
$obj = json_decode($str);
foreach($obj as $elem){
echo implode(",",$elem->keyword)."\n";
}
?>
live demo : https://eval.in/790394