gistfile1.php

<?php
function unicode_decode ( $string )
{
    function decode_unicode ( $c )
    {
		return ( ( $c = ( isset ( $c[3] ) ? $c[3]
				:
				( isset ( $c[2] ) ? hexdec ( $c[2] )
				:
				hexdec ( $c[1] ) ) ) ) < 0x80 ? chr ( $c )
				:
				( $c < 0x800 ? chr ( 0xc0 | ( $c >> 6 ) ) . chr ( 0x80 | ( $c & 0x3f ) )
				:
				( $c < 0x10000 ? chr ( 0xe0 | ( $c >> 12 ) ) . chr ( 0x80 | ( ( $c >> 6 ) & 0x3f ) ) . chr ( 0x80 | ( $c & 0x3f ) )
				:
				( $c < 0x200000 ? chr ( 0xf0 | ( $c >> 18 ) ) . chr ( 0x80 | ( ( $c >> 12 ) & 0x3f ) ) . chr ( 0x80 | ( ( $c >> 6 ) & 0x3f ) ) . chr ( 0x80 | ( $c & 0x3f ) ) : '' ) ) )
			);
    }

	return preg_replace_callback ( '~(?:\\\\\\u|%u)([0-9a-f]{4})|&#x0*([0-9a-f]+);|&#0*([0-9]+);~i', 'decode_unicode', $string );
}
?>