multiple image upload issue while editing images in codeigniter php

i have an image upload form, while adding the upload is working fine. Now my edit form looks like below:

                 <input type="hidden" name="pimage2old" value="<?=$val['pimage2']?>">
                      
                      <?php
                      $selectedDays = $val['days'];
$titles = explode('|', $val['title']);
$pimages = explode('|', $val['pimage2']);
$details = explode('|', $val['details']);
$notes = explode('|', $val['note']);
                      
                      ?>
                       <div class="col-md-12 position-relative" id="dayRows" >
    <?php for ($i = 1; $i <= 100; $i++) : ?>
        <div class="row" style="margin-bottom:1%;<?= ($i <= $selectedDays) ? '' : 'display:none;' ?>" id="day<?php echo $i; ?>Row">
            <div class="col-md-2 position-relative">
                <label class="form-label" style="font-weight:bold">Day <?php echo $i; ?></label>
            </div>
            <div class="col-md-2 position-relative">
                <label class="form-label" for="validationTooltip14">Title</label>
                <input class="form-control" id="validationTooltip14" type="text" name="title[]" value="<?=$titles[$i-1]?>" onkeypress="return RestrictCommaSemicolon(event);"
    ondrop="return false;" onfocusout="checkComma(this);">
            </div>
            <div class="col-md-2 position-relative">
                <label class="form-label" for="validationTooltip15">Image: <?php if($pimages[$i-1]){?><a target="_blank" href="<?php echo base_url()?>uploads/packages/<?=$pimages[$i-1]?>">View Image</a><?php } ?></label>
                <input class="form-control" id="validationTooltip15" type="file" name="pimage2[]" >
                
            </div>
            <div class="col-md-3 position-relative">
                <label class="form-label" for="validationTooltip16">Details</label>
                <textarea class="form-control" id="validationTooltip16" name="details[]" onkeypress="return RestrictCommaSemicolon(event);"
    ondrop="return false;" onfocusout="checkComma(this);"><?=$details[$i-1]?></textarea>
            </div>
            <div class="col-md-3 position-relative">
                <label class="form-label" for="validationTooltip17">Note</label>
                <textarea class="form-control" id="validationTooltip17"  name="note[]" onkeypress="return RestrictCommaSemicolon(event);"
    ondrop="return false;" onfocusout="checkComma(this);"><?=$notes[$i-1]?></textarea>
            </div>
        </div>
    <?php endfor; ?>
</div>

and my controller to handle images is like

              if (!empty($_FILES['pimage2']['name'])) {
    $config2['upload_path'] = './uploads/packages/';
    $config2['allowed_types'] = '*';

    $this->load->library('upload');

    $images = array();
    $filesCount = count($_FILES['pimage2']['name']);
    $oldImages = explode('|', $details['pimage2old']);

    for ($i = 0; $i < $filesCount; $i++) {
        if (!empty($_FILES['pimage2']['name'][$i])) {
            $_FILES['userFile']['name'] = $_FILES['pimage2']['name'][$i];
            $_FILES['userFile']['type'] = $_FILES['pimage2']['type'][$i];
            $_FILES['userFile']['tmp_name'] = $_FILES['pimage2']['tmp_name'][$i];
            $_FILES['userFile']['error'] = $_FILES['pimage2']['error'][$i];
            $_FILES['userFile']['size'] = $_FILES['pimage2']['size'][$i];

            $this->upload->initialize($config2);

            if ($this->upload->do_upload('userFile')) {
                $uploadData2 = $this->upload->data();
                $images[$i] = $uploadData2['file_name'];
            } else {
                $error = array('error' => $this->upload->display_errors());
                var_dump($error);
                $images[$i] = '';
            }
        } else {
            $images[$i] = $oldImages[$i];
        }
    }

    // Concatenate the image names with a pipe separator
    $picture2 = implode('|', $images);
} else {
    $picture2 = $details['pimage2old'];
}

here the upload is not working, if i replace any specific image or add an image to a field where image is not there, its not happening, previous images are not replaced also, what could be the issue here, thanks in advance

If you use if (!empty($_FILES['pimage2']['name'][0])) it'll only process the uploaded images if a new image was uploaded for the first field.

Your intention is probably to check if any images were uploaded, and if so process them all.

But with your form setup, $_FILES['pimage2']['name'] will always have a value (if no images were uploaded this'll contain an array with empty strings) so if (!empty($_FILES['pimage2']['name'])) will always return true. So there's no easy way to check if any images were uploaded unless you loop through the $_FILES array and check them one by one.

And since you're already doing that in the inner loop with if (!empty($_FILES['pimage2']['name'][$i])), I would suggest removing the outer if altogether:

$config2['upload_path'] = './uploads/packages/';
$config2['allowed_types'] = '*';

$this->load->library('upload');

$images = array();
$filesCount = count($_FILES['pimage2']['name']);
$oldImages = explode('|', $details['pimage2old']);

for ($i = 0; $i < $filesCount; $i++) {
    if (!empty($_FILES['pimage2']['name'][$i])) {
        $_FILES['userFile']['name'] = $_FILES['pimage2']['name'][$i];
        $_FILES['userFile']['type'] = $_FILES['pimage2']['type'][$i];
        $_FILES['userFile']['tmp_name'] = $_FILES['pimage2']['tmp_name'][$i];
        $_FILES['userFile']['error'] = $_FILES['pimage2']['error'][$i];
        $_FILES['userFile']['size'] = $_FILES['pimage2']['size'][$i];

        $this->upload->initialize($config2);

        if ($this->upload->do_upload('userFile')) {
            $uploadData2 = $this->upload->data();
            $images[$i] = $uploadData2['file_name'];
        } else {
            $error = array('error' => $this->upload->display_errors());
            var_dump($error);
            $images[$i] = '';
        }
    } else {
        $images[$i] = $oldImages[$i];
    }
}

// Concatenate the image names with a pipe separator
$picture2 = implode('|', $images);