public function EWKB::read in geoPHP 8
Same name and namespace in other branches
- 7 geoPHP/lib/adapters/EWKB.class.php \EWKB::read()
Read WKB binary string into geometry objects
Parameters
string $wkb An Extended-WKB binary string:
Return value
Overrides WKB::read
File
- geoPHP/
lib/ adapters/ EWKB.class.php, line 15
Class
- EWKB
- EWKB (Extended Well Known Binary) Adapter
Code
public function read($wkb, $is_hex_string = FALSE) {
if ($is_hex_string) {
$wkb = pack('H*', $wkb);
}
// Open the wkb up in memory so we can examine the SRID
$mem = fopen('php://memory', 'r+');
fwrite($mem, $wkb);
fseek($mem, 0);
$base_info = unpack("corder/ctype/cz/cm/cs", fread($mem, 5));
if ($base_info['s']) {
$srid = current(unpack("Lsrid", fread($mem, 4)));
}
else {
$srid = NULL;
}
fclose($mem);
// Run the wkb through the normal WKB reader to get the geometry
$wkb_reader = new WKB();
$geom = $wkb_reader
->read($wkb);
// If there is an SRID, add it to the geometry
if ($srid) {
$geom
->setSRID($srid);
}
return $geom;
}