====== PHP and SQL ======

  * select today data entry <code>where DATE(`time_entry`) = CURDATE()</code>
  * ref: date related: https://popsql.com/learn-sql/mysql/how-to-query-date-and-time-in-mysql
  * select current week data entry with option of week start day <code>
where YEARWEEK(`time_entry`) = YEARWEEK(CURDATE())
where YEARWEEK(`time_entry`, 1) = YEARWEEK(CURDATE(), 1)</code>
    * Note: weekofyear return week number, means previous year will return too <code>where  WEEKOFYEAR(`time_entry`) = WEEKOFYEAR(NOW());</code>
  * select current month data entry <code>where YEAR(`time_entry`) = YEAR(NOW()) AND MONTH(`time_entry`)=MONTH(NOW());</code>
  * select past 24 hr <code>where `time_entry`> DATE_SUB(NOW(), INTERVAL 1 DAY)</code>
  * select past 7 days <code>where `time_entry`> DATE_SUB(NOW(), INTERVAL 1 WEEK)</code>
  * select past 1 month time <code>where `time_entry`> DATE_SUB(NOW(), INTERVAL 1 MONTH)</code>


  * array related <code>
// sort array
sort($my_list);
</code>

  * unicode data insert, make sure
    - database table's charset is utf8mb4 in sql<code>
CREATE TABLE info_table (
  id int(11) NOT NULL PRIMARY KEY AUTO_INCREMENT,
  name varchar(50) NOT NULL,
  edit_time DATETIME NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
</code>
    - make sure database connect is set to utf8mb4 mode in php before query and insert<code>
mysqli_set_charset($con, "utf8mb4");
</code>
    - make sure charset is declared in html <code>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</code>
====== Php Date and Time Related ======
  * all time info <code>
date('N'); // current day of week, 6 for saturday
date('N', date_val) // day of week for that date data
date("Y-m-d"); // today's date string
</code>

  * get current week range (monday to sunday) or any day's week range <code php>
//ref: https://stackoverflow.com/questions/5552862/finding-date-range-for-current-week-month-and-year
function rangeWeek($datestr) {
    date_default_timezone_set('Asia/Singapore');
    $date_val = strtotime($datestr);
    return array (
     "start" => date('N', $date_val) == 1 ? date ('Y-m-d', $date_val) : date ('Y-m-d', strtotime('last monday', $date_val)),
     "end" => date('N', $date_val) == 7 ? date ('Y-m-d', $date_val) : date ('Y-m-d', strtotime('next sunday', $date_val))
    );
}
echo rangeWeek('2011-4-5');
</code>

  * show during time range: https://stackoverflow.com/questions/25921296/i-would-like-to-show-messages-according-to-time-range-between-two-time-stamps/25921549

====== Python to Php ======

^   ^ python ^ php ^
| string operation | word.strip() | trim($word) |
|  | word[1:5] | substr($word, 1, 5) |
|  | word[1:] | substr($word, 1) |
|  | prefix+subfix | $prefix.$subfix |
|  | text.replace('find','replace') | str_replace('find','replace',$text) |
|  | text.lower() | strtolower($text) |
|  | text.startswith(prefix) | ? |
| list operation | res_list = [x.strip() for x in txt.split('\n')] | $res_list = array_map('trim', explod('\n', $txt)) |
| | | <code>$res_list = array_map('trim', preg_split("/\r\n|\n|\r/", $selected) ); // ok for text</code> |
| | res_list.append(tmp_img) | array_push($res_list, $tmp_img); |
| |  | $res_list[] = $tmp_img; |
| | for each in word_list: | foreach($word_list as $each){} |
| | if id in check_list: | if(in_array($id, $check_list)){} |
| logic | if mark == '#': pass; elif mark == '*' | if($mark==="#"){} elseif($mark==="*"){} |

<code>
php: 
$tmp_path = $path.strtolower(str_replace(' ','_', trim(substr($each,1)))).'.jpg';
$tmp_img = sprintf('<br><img src="%s">', $tmp_path);
array_push($res_list, $tmp_img);
join("\n",$res_list);

python: (human logic writing)
tmp_path = path + each[1:].strip().replace(' ','_').lower()+ '.jpg'
tmp_img = '<br><img src="{0}">'.format(tmp_path)
res_list.append(tmp_img)
'\n'.join(res_list)
</code>

====== Use PHP as HTML File output process ======

  * other than serve php page through apache server, php in commandline also can be used to create html local page.
  * cmd code for render php to html file<code>
cd php_root_path
php.exe D:\path_to_php_web_page\test.php D:\path_to_php_web_page\test_out.html
</code>