Can not delete element fron JSON using PHP

Question

I have an issue. I need to delete the element from JSON as per key value using PHP but its having some problem. I am explaining my code below.

<?php
$comment = json_encode(array(array('day_id' => '', 'comment' => ''),array('day_id' => '2', 'comment' => 'hello'), array('day_id' => '3', 'comment' => 'vodka3'),array('day_id'=>'','comment'=>'')));
$arrComment = json_decode($comment, true);
$imgarr=array();
for($i=0;$i<count($arrComment);$i++){
    if($arrComment[$i]['day_id']=='' && $arrComment[$i]['comment']==''){
        unset($arrComment[$i]);
    }
}
$arrComment=array_values($arrComment);
print_r($arrComment);
?>

Here when my multiple element key value is blank its not working. BUt if one single case its working. Here my need is if any of element day_id and comment is blank those element will remove from that json object and it will re-index again. Please help me.

@Rax Weber He just encode and decode it for better question. — Kacper Polak
– Kacper Polak, Commented Oct 19, 2016 at 7:27

u_mulder · Accepted Answer · 2016-10-19 07:27:44Z

2

After doing unset($arrComment[$i]); length of your array reduces. So, count($arrComment) is not 4 but 3. That's why your last element is not reached. To avoid this - use count() before starting the loop:

$cou = count($arrComment);
for($i=0; $i<$cou; $i++){
    if($arrComment[$i]['day_id']=='' && $arrComment[$i]['comment']==''){
        unset($arrComment[$i]);
    }
}

Or use for example array_filter:

$arrComment = array_filter(
    $arrComment,
    function($v) { return $v['day_id']!='' && $v['comment']!=''; }
);
print_r($arrComment);

answered Oct 19, 2016 at 7:27

u_mulder

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