[support] Substr or Drupal_substr?

[Ms. Nancy Wichmann]

Coder keeps flagging this, so I thought I'd ask about it. Following a parse_url() of a URL input from a form, is the use of drupal_substr() really necessary, or is a basic substr() adequate?

 
Nancy 

Injustice anywhere is a threat to justice everywhere. -- Dr. Martin L. King, Jr.
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