update src folder link

[Arhell]

Q	A
Is bugfix?	✔️/❌
New feature?	✔️/❌
Breaks BC?	✔️/❌
resolve #147

[what-the-diff]

PR Summary

• Updated Link to PHP Manual in Comment
  The pull request includes an change to a comment within the code. This modification isn't altering the program at all, but improving the documentation for developers by updating the link to the relevant PHP manual. This will offer a more secure connection when visiting the manual due to change of protocol from 'http' to 'https'.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (40eec85) 99.76% compared to head (4b8b3aa) 99.76%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #148   +/-   ##
=========================================
  Coverage     99.76%   99.76%           
  Complexity      212      212           
=========================================
  Files             4        4           
  Lines           422      422           
=========================================
  Hits            421      421           
  Misses            1        1           

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