［PHP］htmlentities 跟 htmlspecialchars 的區別

htmlentities

- Convert all applicable characters to HTML entities.
- [ Manual ]

htmlspecialchars

- Convert special characters to HTML entities.

- The translations performed are:

• '&' (ampersand) becomes '&'
• '"' (double quote) becomes '"' when ENT_NOQUOTES is not set.
• "'" (single quote) becomes ''' (or ') only when ENT_QUOTES is set.
• '<' (less than) becomes '&lt;'
• '>' (greater than) becomes '&gt;'

- [ Manual ]

［PHP］Error: Only variables should be passed by reference

　　Strict Standards: Only variables should be passed by reference in '\pach\filename.php' on line NNN .

第NNN行：$price = array_shift(get_product_price($product_key));

［PHP］empty(),is_null(),isset 判斷結果列表

資料來源：謝晒的PHP網頁設計