File Upload Conditions helper in Codeigniter

usage :

<?php

$this->load->helper('my_file_upload_helper');

    check_file_is_image($_FILES['input_type_field_name']['name']);

?>

filename : my_file_upload_helper.php
<?php
function check_file_is_image($fileName,$extendsion_array=''){
    //you need to send $_FILES["fileToUpload"]["name"]
    $imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
    if($imageFileType != "jpg" && $imageFileType != "png" && $imageFileType != "jpeg"
        && $imageFileType != "gif" ) {
        //set_flash_msg("Sorry, only JPG, JPEG, PNG & GIF files are allowed.","myred");
        echo "Sorry, only JPG, JPEG, PNG & GIF files are allowed.";
        return false;
    }return TRUE;
}

function check_file_size($fileName, $maxSize='2000'){
    //you need to send $_FILES["fileToUpload"]["size"]
    if ($_FILES["fileToUpload"]["size"] > $maxSize) {
        //set_flash_msg("Sorry, your file is too large.","myred");
        echo "Sorry, your file is too large.";
        return false;
    }return true;
}

function check_file_exists($target_file){
    if (file_exists($target_file)) {
        //set_flash_msg("Sorry, file already exists.","myred");
        echo "Sorry, file already exists.";
        return false;
    }return true;
}
?>