Htmlentities () Single and double quotes non-conversion solution

Htmlentities () Single and double quotes do not convert

PHP Code

  
   
  
   Echo htmlentities ($str, ent_quotes);
"; Echo htmlentities ($str, ent_noquotes);? >

Here is why I do not convert to single double quotes??

The following is my browser output

HTML Code

  
   John & ' Adams '
John & ' Adams '
John & ' Adams '

------Solution--------------------
So what are those & things that begin with?
------Solution--------------------
? Ent_compat-Default. Encodes only double quotes.
? Ent_quotes-encodes double and single quotation marks.
? Ent_noquotes-do not encode any quotation marks.
------Solution--------------------
' is a single quote
------Solution--------------------
The landlord is expected to look at the HTML in the browser to display the effect, rather than look at the HTML source

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