Les flags en php

$numero=array('mdl_log1','mdl_log2','mdl_log3','mdl_log4','mdl_log5','mdl_log6','mdl_log7');
function Ma_Fonction($flag)
{
if ($flag = 0) 
{

$sql_table= "CREATE TABLE  $numero[0]  as (SELECT * FROM `moodle`.`mdl_log` WHERE `mdl_log`.`id` >=$VAL_MIN AND `mdl_log`.`id`<=$dx1 )";
$res_sql_table=mysql_query($sql_table);
if($res_sql_table==FALSE)
{die(mysql_error());
mysql_close();}
}

if ($flag = 1) 
{
$sql_table3= "INSERT INTO $numero[0]  (SELECT * FROM `moodle`.`mdl_log` WHERE `mdl_log`.`id` >=$VAL_MIN AND `mdl_log`.`id`<=$dx1) ";
$res_sql_table3=mysql_query($sql_table3);
if($res_sql_table3==FALSE)
{die(mysql_error());
mysql_close();}
}
echo ' le falg est égal a ' .$flag;
}

if ($flag = 0)..... 

if ($flag == 0)

function Ma_Fonction($flag = FALSE ) {
    if ($flag == FALSE)  {
        .......
    }
    .......
    if ($flag == TRUE) {
        .....
    }
}

ma_fonction(TRUE)

ma_fonction(FALSE)

ma_fonction()