dBase

简介
安装/配置
预定义常量
dBase 函数
- dbase_add_record — Adds a record to a database
- dbase_close — Closes a database
- dbase_create — Creates a database
- dbase_delete_record — Deletes a record from a database
- dbase_get_header_info — Gets the header info of a database
- dbase_get_record_with_names — Gets a record from a database as an associative array
- dbase_get_record — Gets a record from a database as an indexed array
- dbase_numfields — Gets the number of fields of a database
- dbase_numrecords — Gets the number of records in a database
- dbase_open — Opens a database
- dbase_pack — Packs a database
- dbase_replace_record — Replaces a record in a database

User Contributed Notes 1 note

down

14 years ago

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

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