It's even faster calling str_replace multiple times than using array if you have less than 5 replacements.

milliseconds for a 500.000 request per day site is a good performance optimize.

1. If you only need to assign a value to a variable(s) once, make sure you place it outside for loops.

2. When possible, only connect to each database once and reuse the connection throughout the running of the script (eg. by using a Factory pattern)

3. avoid excess logic if, switch etc. if you can try to put logic code in the same if statement.

Dont do

if ($i == 1) {

// do stuff

}

else {

// do more stuff

}

if ($i == 1) {

// do even more stuff

}

Okay to do:

if ($i == 1) {

//do stuff

// do even more stuff

}

else {

// do more stuff

}

4. Cache, cache, cache… if you expect the same data each time until a user does someone or admin changes it, then cache the content using something like memcache.

5. be VERY careful with system calls as process intense commands may not only slow your script down, but possible the whole server, eg. imagemagick.

How to speed up your PHP code….