PHP code optimization tips

[Kalyan]

PHP code optimization tips

# If a method can be static, declare it as static. It will improve the Speed by a factor of 4.

# You should use echo as it is faster than print.

# If you have to concat string, Use echo's multiple parameters.

# Set the value of how many times it should be iterated before the loop. Do not assign the value in the loop.

# When a variable is no longer useful, unset those variables which will free memory.

# Use absolute urls in includes and requires.

# To get the time of when the script started its execution, you must prefer $_SERVER ['REQUEST_TIME'] than time ()

# Str_replace is faster than preg_replace

# It is much better to utilize switch statements than multi if, else if statements.

# Every time close your database connections when you got all the datas from DB

# Always use $row ['name'] to get data from DB.Because it is 7 times faster than $row [name]

# Don't use functions inside of for loop, such as for ($y=1; $y <= main ($arr); $y) the main () function gets called each time.

# If you declare a global variable and you are not using it in any function will slow down the performance because will check if the global exists or not.

# Methods should be in derived classes. This will run faster than the method which was defined in the base class.

# Surrounding your string by single quote (') instead of double quotes (") will be little faster as php looks for variables inside "" but not inside ''.

# A PHP script will be at least 2-10 times slower than a static HTML page by Apache. So it is better to use lot of static HTML pages with less scripts.

# You must install a PHP caching product to naturally boost the performance by 25-100% by eliminating compile times. Your PHP scripts will be recompiled each time if the scripts are not cached.

# Do not use OOP concepts too much because each method and object call consumes a lot of memory.

# Split methods that has the code you will really re-use too much.Do not split all the functions.