Description
string 
rawurlencode ( string str )
   Returns a string in which all non-alphanumeric characters except
   -_. have been replaced with a percent
   (%) sign followed by two hex digits.  This is
   the encoding described in RFC 1738 for protecting literal
   characters from being interpreted as special URL delimiters, and
   for protecting URLs from being mangled by transmission media
   with character conversions (like some email systems). For
   example, if you want to include a password in an FTP URL:
  
   
Example 1. rawurlencode() example 1 
<?php echo '<a href="ftp://user:', rawurlencode('foo @+%/'),      '@ftp.example.com/x.txt">'; ?>
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   Or, if you pass information in a PATH_INFO component of the URL:
  
   
Example 2. rawurlencode() example 2 
<?php echo '<a href="http://example.com/department_list_script/',     rawurlencode('sales and marketing/Miami'), '">'; ?>
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   See also rawurldecode(),
   urldecode(),
   urlencode() and
   RFC 1738.