html - Fatal error: Can't use function return value in write context in views/stock/form.php on line 29

Solution:

That's because you are usingempty() on thetrim() function.

Trytrim() before passing the data to theempty() function, Something like this:

<?php $item_name=trim($row->item_name); ?>
<input type="text" required="required" name="i_name" class="form-control"
   placeholder="Masukkan nama item..." <?php if (!empty($item_name)) {
echo 'value="' . $row->item_name . '"';
} ?> />
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Also, if it was me, I recommend using a cleaner code:

<?php
$item_name=trim($row->item_name);
$value='';
if(!empty($item_name)){
    $value='value="'.$row->item_name.'"';
}
?>
<input type="text" required="required" name="i_name" class="form-control" placeholder="Masukkan nama item..." <?=$value;?> />
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Solution:

this might work

<input type="text" required="required" name="i_name" class="form-control"
   placeholder="Masukkan nama item..." <?php if (!empty(trim($row->item_name))) {
echo 'value="' . $row->item_name . '"';
} ?> />
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what I have done is changed your

<?php if(!empty(trim($row->item_name))){ ?> value="<?= $row->item_name ?>"<?php } ?>
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to

<?php if (!empty(trim($row->item_name))) {
echo 'value="' . $row->item_name . '"';
} ?>
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Solution:

Try another approch:

<?php if(!empty(trim($row->item_name))){$i_name = $row->item_name;} ?>
<input type="text" required="required" name="i_name" class="form-control" placeholder="Masukkan nama item..." value="<?php echo $i_name; ?>" />
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Solution:

Simple Assign the value to new variablevalue="<?= !empty($ne_variable=trim($row->item_name))? $row->item_name:'' ?>"

<input type="text" required="required" name="i_name" class="form-control" placeholder="Masukkan nama item..." value="<?= !empty($ne_variable=trim($row->item_name))?  $row->item_name:'' ?>" />
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