<?php


$conn = mysqli_connect("localhost","yellow_db","office3ffff21451s23","yellow_db");
if(isset($_POST["import"])){
    ini_set('max_execution_time', 800);
    $fileName = $_FILES["file"]["tmp_name"];
    if($_FILES ["file"]["size"] > 0){
        $file = fopen($fileName, "r");
        while(($column = fgetcsv($file,10000, ","))  !== FALSE){
            $sqlInsert ="Insert into data ( ext_compay_ids) values ('" . $column[0] . "')";
            $result = mysqli_query($conn, $sqlInsert);
        }
            if(!empty($result)){
                echo "csv data imported";
            }else{
                echo "Data not importing";
            }
    }
}

?>

<form class="form-horizoontal" action="" method="post" name="uploadCsv" enctype="multipart/form-data">

<div>
    <label for="">Choose file</label>
    <input type="file" name="file" accept=".csv">
    <button type="submit" name="import">Import</button>
</div>
</form>