PHP MySQL - Validate email in PHP - php

Question

currently I do a checking function to know email already exist or not in db. If exist then error, if not update data. But if existing user edit their data such as weight. Then it will give error because it detect email already exist. But the user only edit the weight data, not the email. can anyone help me how to solve this problem or have any recommendation to do this part. I'm using a CodeIgniter framework.
This is my controller
if (!empty($this->input->post()))
{
$data["weight"] = $this->input->post("weight");
$data["height"] = $this->input->post("height");
$data["username"] = $this->input->post("username");
$data["email"] = $this->input->post("email");
if (strlen($this->input->post("username")) < 6)
{
$result = $this->Global_model->GenerateOutputMsgArray("0", "Username should be at least 6 alphanumerics, please try again.");
}
elseif (!$this->Profile_model->ValidateEmail($this->input->post()))
{
$result = $this->Global_model->GenerateOutputMsgArray("0", "Email has been taken, please try another.");
} else {
$result["status"] == "1";
$this->Profile_model->UpdateProfile($data["weight"], $data["height"], $data["username"], $data["email"]);
$result = $this->Global_model->GenerateOutputMsgArray("1", "Your profile has been updated.", $data);
}
this is my model (validate email function and update data)
public function ValidateEmail($post)
{
$stat = "0";
$msg = "";
$data = array();
$output = array();
$query = $this->db->get_where("user", array("email" => $post["email"]));
$result = $query->row();
$result = (array)($result);
return ($result) ? false : true;
}
function UpdateProfile($weight, $height,$username, $email)
{
$data= array(
"weight" => $weight,
"height" => $height,
"username" => $username,
"email" => $email
);
$this->db->where("user_id", $this->session->userdata("user_id"));
$this->db->update("user", $data);
}
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Answer 1

You must be having user_id with email.
Try with this one.
public function ValidateEmail($post)
{
$stat = "0";
$msg = "";
$data = array();
$output = array();
$query = $this->db->get_where("user", array("email" => $post["email"]));
if($query->num_rows() > 0){
$result = $query->row();
if($result->user_id == $this->session->userdata("user_id")){
return false; // force doesn't exist
}else{
return true; // exists
}
}else{
return false; // as there is no row returned. it will return as doesn't exist
}
}