Someone told me that my query is good for learning basis, but not for real world applications. Plz guide me

My Code: Connectivity(php)

<?php  $  conn=mysqli_connect("localhost","root","","webchat_data"); //if($  conn) //{ //  echo "hi"; //} if(!$  conn){     die("CONNECTION FAILED" .mysqli_connect_error()); }    ?> 

Signup

<?php include 'connectivity.php'; $  uname=($  _POST['uname']); $  email=($  _POST['Email']); $  pass=($  _POST['Password']);   $  sql = "INSERT INTO `sign-up`(USERNAME,EMAIL_ID,PASSWORD) VALUES('$  uname','$  email','$  pass')"; //$  result=$  conn->query($  sql); $  result = mysqli_query($  conn, $  sql); //$  query=mysqli_query($  conn,$  sql);  header("Location:index.php");      ?> 

Plz make some recommendations to make this code more accruate and for real world scenarios.

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FFFFFFFF partition problem, not able to fix with the guide in other topics

Like many other uses who reported the same problem, I tried to install and delete Ubuntu in my 13′ mid-2014 MBP, messed up and got FFFFFFFF-FFFF-FFFF-FFFFFFFF partition, tried to follow the solutions in other topics, especially this one OS volume shows as type ‘FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF’ [duplicate]

Unfortunately was not able to fix the issue. As I’m a new user and don’t have enough reputation, was not able to add comment to that topic, this why I opened this new topic.

diskutil list result before and after I messed up with the partitions(diskutil list result before and after I messed up with the partitions)

I then booted from an external bootable macOS installation disk, follow the instructions in above topic (diskutil list, gpt -r show disk0, diskutil umountDisk disk0, gpt remove -i 2 disk0, but when I tried gpt add -i 2 -b 409600 -s 431203056 -t 7C3457EF-0000-11AA-AA11-00306543ECAC disk0 it showed Resource busyerror).

After rebooting to the macOS installation disk and tried to do everything all over again, got the following results:

-bash-3.2# diskutil list /dev/disk0 (internal, physical):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:      GUID_partition_scheme                        *251.0 GB   disk0    1:                        EFI EFI                     209.7 MB   disk0s1    2:       Microsoft Basic Data BOOTCAMP                33.8 GB    disk0s3  /dev/disk1 (external, physical):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:      GUID_partition_scheme                        *16.0 GB    disk1    1:                        EFI EFI                     209.7 MB   disk1s1    2:                  Apple_HFS Install macOS Mojave    15.7 GB    disk1s2  /dev/disk2 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:      GUID_partition_scheme                        +2.1 GB     disk2    1:                  Apple_HFS OS X Base System        2.0 GB     disk2s1  /dev/disk3 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +5.2 MB     disk3  /dev/disk4 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +524.3 KB   disk4  /dev/disk5 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +524.3 KB   disk5  /dev/disk6 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +524.3 KB   disk6  /dev/disk7 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +2.1 MB     disk7  /dev/disk8 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +524.3 KB   disk8  /dev/disk9 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +524.3 KB   disk9  /dev/disk10 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +12.6 MB    disk10  /dev/disk11 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +4.2 MB     disk11  /dev/disk12 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +1.0 MB     disk12  /dev/disk13 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +2.1 MB     disk13  /dev/disk14 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +524.3 KB   disk14  /dev/disk15 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +524.3 KB   disk15  /dev/disk16 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +1.0 MB     disk16  /dev/disk17 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +6.3 MB     disk17  /dev/disk18 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +6.3 MB     disk18  /dev/disk19 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +524.3 KB   disk19  /dev/disk20 (disk image):    #:                       TYPE NAME                    SIZE       IDENTIFIER    0:                            untitled               +2.1 MB     disk20  -bash-3.2# gpt -r show disk0 gpt show: disk0: Suspicious MBR at sector 0       start       size  index  contents           0          1         MBR           1          1         Pri GPT header           2         32         Pri GPT table          34          6                   40     409600      1  GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B      409640  380859368      2  MBR part 218   381269008   42970096            424239104   65994752      3  GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7   490233856        863            490234719         32         Sec GPT table   490234751          1         Sec GPT header -bash-3.2# diskutil umountDisk disk0 Unmount of all volumes on disk0 was successful -bash-3.2# gpt remove -i 2 disk0 gpt remove: disk0: Suspicious MBR at sector 0 -bash-3.2# gpt add -i 2 -b 409600 -s 431203056 -t 7C3457EF-0000-11AA-AA11-00306543ECAC disk0 gpt add: unable to open device 'disk0': Resource busy -bash-3.2# diskutil verifyDisk disk0 Started partition map verification on disk0 Checking prerequisites Checking the partition list Checking the partition map size Checking for an EFI system partition Checking the EFI system partition's size Checking the EFI system partition's file system Checking the EFI system partition's folder content Checking all HFS data partition loader spaces Checking booter partitions Checking Core Storage Physical Volume partitions The partition map appears to be OK Finished partition map verification on disk0 -bash-3.2# diskutil verifyVolume disk0s2 Unable to find disk for disk0s2 -bash-3.2# dd if=/dev/disk0s2 count=3 | hexdump -bash: hexdump: command not found dd: /dev/disk0s2: No such file or directory 

The FFFF partition is gone along with the disk0s2, don’t know what to do now, please anyone help.