note 92631 added to book.dbase
| From: | Anonymous at osu1 dot php dot net | Date: | Sat, 01 Aug 2009 04:51:12 +0000 |
| Subject: | note 92631 added to book.dbase | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-158982@lists.php.net to get a copy of this message | ||
Unfortunately the dbase functions are not compiled into my commercial server's php and I needed
to read some geo data in shape files, which include data in dbfs.
So maybe this will help some others:
function echo_dbf($dbfname) {
$fdbf = fopen($dbfname,'r');
$fields = array();
$buf = fread($fdbf,32);
$header=unpack( "VRecordCount/vFirstRecord/vRecordLength", substr($buf,4,8));
echo 'Header: '.json_encode($header).'<br/>';
$goon = true;
$unpackString='';
while ($goon && !feof($fdbf)) { // read fields:
$buf = fread($fdbf,32);
if (substr($buf,0,1)==chr(13)) {$goon=false;} // end of field list
else {
$field=unpack( "a11fieldname/A1fieldtype/Voffset/Cfieldlen/Cfielddec",
substr($buf,0,18));
echo 'Field: '.json_encode($field).'<br/>';
$unpackString.="A$field[fieldlen]$field[fieldname]/";
array_push($fields, $field);}}
fseek($fdbf, $header['FirstRecord']+1); // move back to the start of the first record
(after the field definitions)
for ($i=1; $i<=$header['RecordCount']; $i++) {
$buf = fread($fdbf,$header['RecordLength']);
$record=unpack($unpackString,$buf);
echo 'record: '.json_encode($record).'<br/>';
echo $i.$buf.'<br/>';} //raw record
fclose($fdbf); }
This function simply dumps an entire file using echo and json_encode, so you can tweak it to your
own needs... (eg random access would just be a matter of changing the seek to : fseek($fdbf,
$header['FirstRecord']+1 +($header['RecordLength']* $desiredrecord0based);
removing the for loop and returning $record
This function doesn't do any type conversion, but it does extract the type if you need to play
with dates, or tidy up the numbers etc.
So quick and dirty but maybe of use to somebody and illustrates the power of unpack.
Erich
----
Server IP: 117.104.162.229
Probable Submitter: 123.211.86.169 (proxied: 123.211.86.169)
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Manual Page -- http://www.php.net/manual/en/book.dbase.php
Edit -- https://master.php.net/note/edit/92631
Del: integrated -- https://master.php.net/note/delete/92631/integrated
Del: useless -- https://master.php.net/note/delete/92631/useless
Del: bad code -- https://master.php.net/note/delete/92631/bad+code
Del: spam -- https://master.php.net/note/delete/92631/spam
Del: non-english -- https://master.php.net/note/delete/92631/non-english
Del: in docs -- https://master.php.net/note/delete/92631/in+docs
Del: other reasons-- https://master.php.net/note/delete/92631
Reject -- https://master.php.net/note/reject/92631
Search -- https://master.php.net/manage/user-notes.php