Keyword Analysis & Research: what is a correct way to add a comment in php

Keyword Analysis

Keyword	CPC	PCC	Volume	Score	Length of keyword
what is a correct way to add a comment in php	1.66	0.1	2092	92	45
what	0.71	0.1	2234	75	4
is	0.65	0.6	6398	6	2
a	0.34	0.6	3487	21	1
correct	1.21	0.4	3528	21	7
way	0.53	0.6	9936	54	3
to	1.28	0.5	931	72	2
add	0.35	0.2	3467	49	3
a	1.78	0.2	1726	91	1
comment	1.93	0.7	8884	70	7
in	1.1	0.4	4464	93	2
php	1.12	0.1	7984	86	3

Keyword	CPC	PCC	Volume	Score
what is a correct way to add a comment in php	1.75	0.8	2791	6
correct way to add a comment in php	1.99	0.4	9843	22
how to comment in php code	1.78	0.6	8816	10
how to write comment in php	1.56	0.9	2704	15
how to use comments in php	0.43	1	7178	20
how to give comments in php	1.47	0.6	2000	41
writing comments in php	1.66	0.8	2248	93
how to write a comment in php	1.04	0.7	5725	36
php how to comment	2	1	1261	29