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:
<?php
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
dBase
- Introducción
- Instalación/Configuración
- Constantes predefinidas
- Funciones de dBase
- dbase_add_record — Añade un registro a una base de datos
- dbase_close — Cierra una base de datos
- dbase_create — Crea una base de datos
- dbase_delete_record — Borra un registro de una base de datos
- dbase_get_header_info — Obtiene la información de cabecera de una base de datos
- dbase_get_record_with_names — Obtiene un registro de una base de datos como una matriz asociativa
- dbase_get_record — Obtiene un registro de una base de datos como una matriz indexada
- dbase_numfields — Obtiene el número de campos de una base de datos
- dbase_numrecords — Obtener el número de registros de una base de datos
- dbase_open — Abre una base de datos
- dbase_pack — Empaquetar una base de datos
- dbase_replace_record — Reemplaza un registro en una base de datos
Anonymous ¶
3 years ago
