PHP MySQL查询

I am having an issue with a SQL Query... I have a file that exports a CSV file which worked until i added a constraint to the query.

Here is what i have

<?php
 $today = date("mdY"); 
 function exportMysqlToCsv($table,$filename = 'TodaysSubmissions.csv')
 {
$csv_terminated = "
";
$csv_separator = ",";
$csv_enclosed = '"';
$csv_escaped = "\\";
$sql_query = "SELECT * FROM $table WHERE submitDate = '".$today."'";

I want to export all of the records from today only and in my form i am using the same date format for $today so it should match.

Also when i change to this it creates the CSV file exactly the way that i want

$sql_query = "SELECT * FROM $table WHERE submitDate = 08142013";

So what am i doing wrong when i call $today in the query? I feel like i have tried this every possible way.

Edit here is the entire file

            $today = date("mdY"); 
        function exportMysqlToCsv($table,$filename = 'TodaysSubmissions.csv')
        {
            $csv_terminated = "
";
            $csv_separator = ",";
            $csv_enclosed = '"';
            $csv_escaped = "\\";
            $sql_query = 'SELECT * FROM $table WHERE submitDate = "'.$today.'"';

            // Gets the data from the database
            $result = mysql_query($sql_query);
            $fields_cnt = mysql_num_fields($result);


            $schema_insert = '';

            for ($i = 0; $i < $fields_cnt; $i++)
            {
                $l = $csv_enclosed . str_replace($csv_enclosed, $csv_escaped . $csv_enclosed,
                    stripslashes(mysql_field_name($result, $i))) . $csv_enclosed;
                $schema_insert .= $l;
                $schema_insert .= $csv_separator;
            } // end for

            $out = trim(substr($schema_insert, 0, -1));
            $out .= $csv_terminated;

            // Format the data
            while ($row = mysql_fetch_array($result))
            {
                $schema_insert = '';
                for ($j = 0; $j < $fields_cnt; $j++)
                {
                    if ($row[$j] == '0' || $row[$j] != '')
                    {

                        if ($csv_enclosed == '')
                        {
                            $schema_insert .= $row[$j];
                        } else
                        {
                            $schema_insert .= $csv_enclosed .
                            str_replace($csv_enclosed, $csv_escaped . $csv_enclosed, $row[$j]) . $csv_enclosed;
                        }
                    } else
                    {
                        $schema_insert .= '';
                    }

                    if ($j < $fields_cnt - 1)
                    {
                        $schema_insert .= $csv_separator;
                    }
                } // end for

                $out .= $schema_insert;
                $out .= $csv_terminated;
            } // end while

            header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
            header("Content-Length: " . strlen($out));
            // Output to browser with appropriate mime type, you choose ;)
            header("Content-type: text/x-csv");
            //header("Content-type: text/csv");
            //header("Content-type: application/csv");
            header("Content-Disposition: attachment; filename=$filename");
            echo $out;
            exit;

If you'd like to have the $today variable available to all your functions, and declare it outside the function, you have to declare it inside the function with global:

<?php
$today = date("mdY"); 

...

function exportMysqlToCsv($table,$filename = 'TodaysSubmissions.csv')
{
  global $today;
  ...
  $sql_query = "SELECT * FROM $table WHERE submitDate = '".$today."'";

Recommended reading

• PHP variable scopes

Also you have this in the "full" code:

$sql_query = 'SELECT * FROM $table WHERE submitDate = "'.$today.'"';

Double quotes won't work, that is for sure.

$today is not defined in your function. Move it into the function.

 function exportMysqlToCsv($table,$filename = 'TodaysSubmissions.csv')
 {
    $today = date("mdY"); 
    $csv_terminated = "
";
    $csv_separator = ",";
    $csv_enclosed = '"';
    $csv_escaped = "\\";
    $sql_query = "SELECT * FROM $table WHERE submitDate = '{$today}'";

Using double quotes, you can just add the variable without needing to use concantentation.

http://php.net/manual/en/language.variables.scope.php