Upload Image

// function upload image

// view username
    function check_username($query)
    {
        global $link;

        $query = "SELECT username FROM tb_admin";
        $result = mysqli_query($link, $query);

        return $result;
    }

    // edit profile
    function edit_profile($username, $password)
    {
        global $link;

        $query  = "UPDATE tb_admin SET username = '$username', password = '$password'";
        if ( mysqli_query($link, $query) ) return true;
        else return false;
    }

    // check image size
    function check_size($image_size)
    {
        if ( 500000 < $image_size ) return true;
        else return false;
    }

    // check image format
    function check_format($imageFormat)
    {
        if ( $imageFormat   == "jpg" && $imageFormat == "jpeg" && $imageFormat == "png") {
            return true;
        }else{
            return false;
        }
    }

    // upload image
    function upload_image($tmp_name, $target_file, $target_dir)
    {
        if (move_uploaded_file($tmp_name, $target_file)) {
            return true;
        } else {
            return false;
        }
    }

// form input
<form class="form" method="POST" action="" enctype="multipart/form-data">
                                        <h4 class="form-section">
                                            <i class="icon-clipboard4"></i> Edit Profile
                                        </h4>
                                        <?php

                                            if ( isset( $_POST['simpan']) ) {

                                                $username = $_POST['username'] ?? '';
                                                $password = $_POST['password'] ?? '';

                                                $image_size  = $_FILES['images']['size'];
                                                $target_dir  = "pages/profile/uploads/";
                                                $tmp_name    = $_FILES["images"]["tmp_name"];
                                                $target_file = $target_dir . basename($_FILES["images"]["name"]);
                                                $imageFormat = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

                                                if ( check_format($imageFormat) ) {
                                                    ?>
                                                    <div class="alert alert-warning alert-dismissible fade in mb-2" role="alert">
                                                        <button type="button" class="close" data-dismiss="alert" aria-label="Close">
                                                            <span aria-hidden="true">&times;</span>
                                                        </button>
                                                        <strong>Warning!</strong> Format hanya boleh jpg, jpeg dan png.
                                                    </div>
                                                    <?php
                                                }

                                                if ( check_size($image_size) ) {
                                                    ?>
                                                    <div class="alert alert-warning alert-dismissible fade in mb-2" role="alert">
                                                        <button type="button" class="close" data-dismiss="alert" aria-label="Close">
                                                            <span aria-hidden="true">&times;</span>
                                                        </button>
                                                        <strong>Warning!</strong> Ukuran foto maksimal 500Kb.
                                                    </div>
                                                    <?php
                                                }

                                                if ( !empty(trim($username)) && !empty(trim($password)) ) {
                                                    if ( edit_profile( $username, $password ) ) {
                                                        $profil_pict = upload_image($tmp_name, $target_file, $target_dir);
                                                        ?>
                                                        <div class="alert alert-success alert-dismissible fade in mb-2" role="alert">
                                                            <button type="button" class="close" data-dismiss="alert" aria-label="Close">
                                                                <span aria-hidden="true">&times;</span>
                                                            </button>
                                                            <strong>Berhasil!</strong> Profile berhasil di edit.
                                                        </div>
                                                        <script type="text/javascript">
                                                            window.location.href = '?pages=profile';
                                                        </script>
                                                        <?php
                                                    }else {
                                                        ?>
                                                            <div class="alert alert-danger alert-dismissible fade in mb-2" role="alert">
                                                                <button type="button" class="close" data-dismiss="alert" aria-label="Close">
                                                                    <span aria-hidden="true">&times;</span>
                                                                </button>
                                                                <strong>Halo!</strong><br> Ada masalah saat menambah data!
                                                            </div>
                                                        <?php
                                                    }
                                                }else{
                                                    ?>
                                                        <div class="alert alert-danger alert-dismissible fade in mb-2" role="alert">
                                                            <button type="button" class="close" data-dismiss="alert" aria-label="Close">
                                                                <span aria-hidden="true">&times;</span>
                                                            </button>
                                                            <strong>Halo!</strong><br> Form tidak boleh kosong!
                                                        </div>
                                                    <?php
                                                }
                                            }
                                        ?>
                                        <div class="form-group">
                                            <label for="username">Username</label>
                                            <input type="text" id="username" class="form-control" placeholder="Masukan Username Baru" name="username" autocomplete="off" required>
                                        </div>
                                        <div class="form-group">
                                            <label for="password">Password</label>
                                            <input type="password" id="password" class="form-control" placeholder="Masukan Password Baru" name="password" autocomplete="off" required>
                                        </div>
                                        <div class="form-group">
                                            <label>Select File</label>
                                            <label id="projectinput7" class="file center-block">
                                                <input type="file" id="file" name="images" required>
                                                <span class="file-custom"></span>
                                            </label>
                                        </div>
                                        <div class="form-actions">
                                            <button type="submit" class="btn btn-info" name="simpan">
                                                <i class="icon-android-checkmark-circle"></i> Edit Profile
                                            </button>
                                        </div>
                                    </form>