php - Form Data Not posting to database -

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can see wrong below code. when submit data using html form expected confirmation confirm registered. however, when check database not there!

i have checked names same names of each input correct , can confirm database connected successfully, along names of database columns ect...

any appreciated.

<?php       if (isset($_post['carrierinsert'])) {      $acc = $_post['acc'];        $sql = "select cariers.acc cariers cariers.acc ='$acc'";    $result = $db->query($sql);     if($result->num_rows > 0) {          echo "<font color='red'>carrier exits</font>";      $sql = "insert cariers ( `reg`, `acc`, `accstatus`, `carramid`, `carrfloor`, `pay`, `comms`)      values ( '".$db->real_escape_string($_post['reg'])."',               '".$db->real_escape_string($_post['acc'])."',               '".$db->real_escape_string($_post['accstatus'])."',               '".$db->real_escape_string($_post['carramid'])."',                     '".$db->real_escape_string($_post['carrfloor'])."',                '".$db->real_escape_string($_post['pay'])."',                      '".$db->real_escape_string($_post['comms'])."' )";           $insert = $db->query($sql);                      echo "<font color='red'>carrier inserted</font>";          }         }          ?>                    <h1>add new</h1>                 <hr>                 <form method="post" action=""> carrier<br />                 <input name="reg" type="text" required="required" value="">              <br /><br />                 number<br />             <input name="acc" type="text" required="required" value="">             <br /><br />                status<br />             <input name="accstatus" type="text" required="required" value="">                  floor<br />             <select name="carrfloor" id="carrfloor">             <option name="carrfloor" value="1">1</option>             <option name="carrfloor" value="2">2</option>             </select>             <br /><br />                 pay<br />             <select name="pay" id="pay">             <option selected="selected" name="pay" value="0">n/a</option>             <option name="pay" value="1">1%</option>             <option name="pay" value="1.25">1.25%</option>             <option name="pay" value="1.5">1.5%</option>             <option name="pay" value="1.75">1.75%</option>             <option name="pay" value="2">2%</option>             <option name="pay" value="2.25">2.25%</option>             <option name="pay" value="2.50">2.50%</option>             <option name="pay" value="3.00">3%</option>             </select>             <br /><br />                additional charge<br />             <select name="comms" id="comms">             <option name="comms" selected ="selected" value="fees">yes</option>             <option name="comms" value="no fees">no</option>             </select>             <br /><br />                manager<br />             <select name="carramid" id="carramid">             <option name="carramid" value="yes">yes</option>             <option name="carramid" value="no">no</option>             </select>             <br /><br />               <br /><br />             <input type="submit" class="btn" name="carrierinsert" value="save" />               </form> 

$sql = "insert cariers ( reg, acc, accstatus, carramid, carrfloor, pay, comms)          values ( '".{$db->real_escape_string($_post['reg'])}."',                   '".{$db->real_escape_string($_post['acc'])}."',                   '".{$db->real_escape_string($_post['accstatus'])}."',                   '".{$db->real_escape_string($_post['carramid'])}."',                         '".{$db->real_escape_string($_post['carrfloor'])}."',                    '".{$db->real_escape_string($_post['pay'])}."',                          '".{$db->real_escape_string($_post['comms'])}."' )";

update

$a = 15;      echo 'this not write 15: $a'         .php_eol.         "this write 15: $a"         .php_eol.         "but can escape variable anyways. dont need change quotes".$a.' dot (.) add method strings'         ;

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