mysqli_fetch_array() or mysqli_fetch_all()?

Question

I see comparisons between mysqli_fetch_array() and mysqli_fetch_all() that say that with mysqli_fetch_all() it will take more memory a

Answer 1

From PHP's page on mysql_fetch_all():

I tested using fetch_all versus while / fetch_array and:

fetch_all uses less memory (but not for so much).

In my case (test1 and test2): 147008,262848 bytes (fetch_all) versus 147112,262888 bytes (fetch_array & while).

So, about the memory, in both cases are the same.

However, about the performance:

My test takes :350ms (worst case) using fetch_all, while it takes 464ms (worst case) using fetch_array, or about 35% worst using fetch_array and a while cycle.

So, using fetch_all, for a normal code that returns a moderate amount of information is:

a. cleaner (a single line of code)
b. uses less memory (about 0.01% less)
c. faster.

php 5.6 32bits, windows 8.1 64bits