html - checkbox value to mysql/php -

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im triyng figure out problem days , have progress im stuck checkbox page.

so "project" kind of "online car stand" , im stuck in insert car part.

i got html , php insert car sql table.

then after car have link insert extras of car, abs,cruise control, gps ...etc...

the html this:

<?php include "verifica.php"; ?> <html> <head> <link rel="stylesheet" href="styles.css"> <title> stand automovel </title> </head>  <body>  <form action="extras.php" method="post"> <p class="style2"style2">&nbsp;extras:  <div class="style2">     <input type="checkbox" name="chk" value="1">gps<br>   <input type="checkbox" name="chk" value="2">abs<br>   <input type="checkbox" name="chk" value="3">computador de bordo<br>   <input type="checkbox" name="chk" value="4">ar condicionado<br>   </div>   <p>&nbsp;</p>     <p><input type=submit value="submeter"> <input type=reset     value="limpar"> </p>     <p>&nbsp;</p>  </form>   </body>

the php page code one:

<html>     <head>         <meta charset="utf-8">         <title>inserir automoveis</title>     </head> <body>  <?php   include "connect.php"; $sql = "insert (extra.id_carro,extra.id_lista_extra) select carro.id_extras , ? carro,lista_extra,extra order carro.id_carro desc limit 1";  if($teste= $mysqli->prepare($sql)) {       $teste->bind_param("s",$_request["extra.id_lista_extra"]);      $teste->execute();   if ($teste>affected_rows == -1) {  echo $print;   echo "<p>". $mysqli->error. "</p>";   } else {   echo "<sp>carro inserido com sucesso!</p>"; }   }    ?>

the goal $sql last id last car inserted on row cars , add 1 him passed check box.

i have tried 1 box because read if checkbox unchecked pass "null"argument.

i tried diferent aproaches. final goal create cicle creates number of rows in table each number of checked in checkbox.

(i tried no sucess)

$checkbox1 = $_post['chk']; if($_post["submit"]=="submit"){      ($i=0;$i<sizeof ($checkbox1)$i++){     $sql = "insert (id_lista_extra)     values('".$checkbox1[$i]."')";        mysql_query($sql) or die(mysql_error());    } }

i got php errors on $i .

if can give me hint appreciate.

thanks

here example have change names inside these $_post variables change html checkbox names have [] after them. e.g 

<input type="checkbox" name="chk[]" value="1">gps<br>  <input type="checkbox" name="chk[]" value="2">abs<br>  $cat_array = array();                 if(isset($_post['chk'])){                     if(is_array($_post['chk'])) {                         foreach($_post['chk'] $value){                           array_push($cat_array, $value);                         }                     }else{                             $value = $_post['chk'];                             array_push($cat_array, $value);                         }                 }

now these values in array. please them, loop through them, call them there indexes, etc..


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