php ini_set函数无效怎么解决

ini_set(‘max_execution_time’,’10′);
ini_set(‘memory_limit’,’1024M’);

echo ‘max_execution_time = ‘ . ini_get(‘max_execution_time’) . ”
“;
echo ‘memory_limit = ‘ . ini_get(‘memory_limit’) . ”
“;
echo ‘post_max_size = ‘ . ini_get(‘post_max_size’) . ”
“;
echo ‘upload_max_filesize = ‘ . ini_get(‘upload_max_filesize’) . ”
“;

ini_set(‘max_execution_time’,’10′);
ini_set(‘memory_limit’,’1024M’);

php_value upload_max_filesize “80M”
php_value post_max_size “80M”
php_value max_execution_time “2000″
php_value memory_limit “150M”

 $old_max_execution_time = ini_set('max_execution_time', 120);
   echo "old timeout is $old_max_execution_time
";

   $max_execution_time = ini_get('max_execution_time');
   echo "new timeout is $max_execution_time
";
  
  
  
  echo 'function sets supported in this install are:
';
  $extensions = get_loaded_extensions();
  foreach ($extensions as $each_ext)
  {
    echo "$each_ext
";
    echo '

';
    $ext_funcs = get_extension_funcs($each_ext);
    foreach($ext_funcs as $func)
    {
       echo "
• $func
";
    }
    echo '