perl > php conversion

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Hello all, I am wondering if anyone would be kind enough to help me with a perl to php conversion.

The perl code

$buffer=$ENV{'QUERY_STRING'};
# Split the name-value pairs
@pairs = split(/&/, $buffer);
foreach $pair (@pairs) {
   ($name, $value) = split(/=/, $pair);
   # Un-Webify plus signs and %-encoding
   $value =~ tr/+/ /;
   $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C", hex($1))/eg;
   $value =~ s/<!--(.|\n)*-->//g;
   if ($allow_html != 1) {
      $value =~ tr/</ /;
      $value =~ tr/>/ /;
   }
   $FORM{$name} = $value;
} 

Thanks for any help

3P