PHP如何编码（转义）@，用于电子邮件验证？

I'm getting this error:

Error Number: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '@gmail.com' at line 1

Here's the code:

$email = $this->input->post('email');

                $checkEmail = $this->crud_model->retrieve_where('employee', 'email', 'email', $email);

crud_model:

function retrieve_where($table, $table_id, $table_name, $value) {
        $table = $this->db->query('Select * FROM ' . $table . ' Where ' . $table_id . ' = ' . $value);
        $records = array();
        foreach ($table->result() as $row) {
            $records[] = $row->$table_name;
        }
        return $records;
    }

The query that you try to execute is:

SELECT * FROM Email WHERE Email = email@email.com

Email is in this case a string, and a string needs to be quoted.

function retrieve_where($table, $table_id, $table_name, $value) {
    $table = $this->db->query("Select * FROM " . mysql_real_escape_string($table) . " Where " . mysql_real_escape_string($table_id) . " = '" . mysql_real_escape_string($value) ."'");
    $records = array();
    foreach ($table->result() as $row) {
        $records[] = $row->$table_name;
    }
    return $records;
}

Dont forget to escape your query with mysql_real_escape_string(). It will protect you against injections.