[php 성능향상을 위해]

1. 문자열 연결시 .(Dot)대신 ,(Comma)를 사용 But 크게 차이 없음...

(테스트해보니 현재는 크게 차이 없음, 오히려 .(dot) 이 더 빠름... 현재는 .(dot) 을 사용하는 것이 좋겠음)

http://www.electrictoolbox.com/php-echo-commas-vs-concatenation/ 

return does only allow one single expression. But echo allows a list of expressions where each expression is separated by a comma. But note that since echo is not a function but a special language construct, wrapping the expression list in parenthesis is illegal. 

Joining two 100 characters strings four million times: 

echo $string1, $string2;

Approx average 1.48 seconds

 

echo $string1 . $string2;

Approx average 1.62 seconds

 

print $string1 . $string2;

Approx average 1.67 seconds

2. 문자열 연결시 '(Single Quotes)보다 "(Double Quotes)를 사용 

3. required와 require_once를 상황에 맞게 적절히 사용 

4. Loop 사용 시 가능한 foreach->while->for 순으로 사용 

5. 파일 크기가 작을 경우에는 fread()를, 클 경우에는 file_get_contents()를 사용 

6. 객체의 속성은 직접 접근하는 것보다, getter, setter 함수를 통해 접근