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Ajouter un préfixe statique sur un numéro qui s'incrémente

Essayez avec str_pad()

Après l'insertion, obtenez dernier identifiant d'insertion .pass avec fonction de génération comme ce paramètre

generate(prefix,last_insert_id);

Ex :generate("REC",1);//REC0001

function generate ($value='',$inp=""){
       return $value.str_pad($inp,4, "0", STR_PAD_LEFT);
}



  //Insert query

   $query = 'INSERT INTO request(req_date, reqname, date, empname, position, account, platform, processor, ram, monitor, phone, phonetype, headset, req_table, req_chair, approval, status) VALUES("'.$req_date_clean.'", "'.$reqname_clean.'", "'.$date_clean.'", "'.$empname_clean.'", "'.$position_clean.'", "'.$account_clean.'", "'.$platform_clean.'", "'.$processor_clean.'", "'.$ram_clean.'", "'.$monitor_clean.'", "'.$phone_clean.'", "'.$phonetype_clean.'", "'.$headset_clean.'", "'.$req_table_clean.'", "'.$req_chair_clean.'", "'.$approval_clean.'", "'.$status_clean.'"); ';
     if(mysqli_query($connect,$query)){
      $last_id = mysqli_insert_id($connect);
      $code = generate("REQ",$last_id);
    mysqli_query($connect,"update request set trackingcode='$code'  where reqnumber='$last_id'");
    //exec code : update tablename set trackingcode='$code'  where tableprimary_id='$last_id'
}