php - No error message in this code but it doesn't delete the fields -

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I do not have any error messages in this code but it does not delete data, however, the database has many records and all fields The names are correct. 

  & lt ;? Php if ($ connect = mysqli_connect ('localhost', 'root', 'adminpass', 'flip')) {$ id = $ _GET ['id']; $ Sql ​​= "SELECT * threads ordered by ID DESC"; $ Query = mysqli_query ($ connect, $ sql); $ Num = mysqli_num_rows ($ query); }? & Gt; & Lt; Form action = "& lt ;? php echo $ _SERVER [" PHP_SELF "] ;? & gt;" Method = "post" & gt; & Lt; Table range = "1" width = "400" cellpadding = "0" cell area = "0" & ​​gt; & Lt; TR & gt; & Lt; TD & gt; # & Lt; / TD & gt; & Lt; TD & gt; Id & lt; / TD & gt; & Lt; TD & gt; Subject & lt; / TD & gt; & Lt; / TR & gt; & Lt ;? Php while ($ row = mysqli_fetch_array ($ query))? & Gt; & Lt; TR & gt; & Lt; TD & gt; & Lt; Input type = "checkbox" name = "checkbox []" value = "& lt ;? php echo $ row ['id']? & Gt;" & Gt; & Lt; / Td> & Lt; Td> & Lt ;? Php echo $ row ['id']? & Gt; & Lt; / Td> & Lt; Td> & Lt ;? Php echo $ line ['subject']? & Gt; & Lt; / Td> & Lt; / TR & gt; & Lt ;? Php}? & Gt; & Lt; Input type = "submit" name = "delete" value = "delete" & gt; & Lt ;? Php if (remove isset ($)) {for ($ i = 0; $ i & lt; $ num; $ i ++) {$ del_id = $ check box [$ i]; $ Sql2 = "Remove from thread where id = '$ del_id'"; $ Query2 = mysqli_query ($ connect, $ sql2); } If ($ query2) {echo "

What's the problem with it?

You can try this: 

   gt; td & gt; id & lt; / td & gt; & lt; td & gt; subject & lt; / td & gt; & lt; / tr & gt; k & lt ;? $ Sql ​​= "SELECT * thread by ID DESC order"; $ Query = mysqli_query ($ connect, $ sql); $ Num = mysqli_num_rows ($ query); / * Submit the number of rows made through hidden input / echo "input type = 'hidden' name = 'hidden' value = '$ num' & gt;"; While ($ row = mysqli_fetch_array ($ query)) / / FETCH data * /? & Gt; & Lt; TR & gt; & Lt; Td> & Lt; Input type = "checkbox" name = "checkbox []" value = "& lt ;? php echo $ row ['id']? & Gt;" Gt; & Lt; / Td> & Lt; Td> & Lt ;? Php echo $ row ['id']? & Gt; & Lt; / Td> & Lt; Td> & Lt ;? Php echo $ line ['subject']? & Gt; & Lt; / Td> & Lt; / TR & gt; By & lt;? } / * When the interval is $ QUERY * /? & Gt; & Lt; Input type = "submit" name = "delete" value = "delete" & gt; & Lt ;? Php mysqli_close ($ connect); ? & Gt; & Lt; / Table & gt; & Lt; / Form & gt;

Explain why your code does not work:

  • Your issued ($ delete) : Where did the $ delete variable come from?
  • Your for loop does not determine if the checkboxes have been submitted or not.
  • Your & lt; Meta & gt; Redirects it to for loop delete.php , so the reason is that you are not seeing any errors but I'm pretty sure That if you go to & lt; Meta & gt; Redirects, you will see some errors.
  • Even though it is working, you will not see the results after that because the removal query is after the data you bring.

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