PHP Special Character filtering

1. The Htmlspecialchars () function converts some predefined characters into an HTML entity function prototype: Htmlspecialchars (String,quotestyle,character-set) predefined characters are:    & (And) Becomes &    "(double quotation mark) becomes"    ' (single quote) becomes '    < (less than) becomes <    > (greater than) becomes >
 
  bold text. "; echo Htmlspecialchars ($STR);? > The HTML output of the above code is as follows (see source code):  Bold text.  Bold text.2. The Htmlspecialchars_decode () function converts some pre-defined HTML entities to characters (and Htmlspecialchars) function prototypes: Htmlspecialchars_decode (String, Quotestyle)
 
  bold text. "; echo Htmlspecialchars_decode ($STR);?> the HTML output of the above code is as follows (view source):   Bold text.  The above code of the browser output: This is some bold text.

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