与具体数据库系统相关的扩展
在线手册：中文 英文
PHP手册

dBase

与具体数据库系统相关的扩展
在线手册：中文 英文
PHP手册
PHP手册 - N: dBase

用户评论:

Stephan (01-Mar-2012 12:27)

Thank you Erich, this really helped me.

To skip deleted records I use this modified (see /**/) version:

<?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='A1DeletionFlag/';
    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, $header['FirstRecord']); // move back to the start of the first record (after the field definitions)
    for ($i=1; $i<=$header['RecordCount']; $i++) {
        $buf = fread($fdbf,$header['RecordLength']);
        $record=unpack($unpackString,$buf);
/**/    if ($record['DeletionFlag'] == '*') continue;
        echo 'record: '.json_encode($record).'<br/>';
        echo $i.$buf.'<br/>';} //raw record
    fclose($fdbf); }
?>

Anonymous (01-Aug-2009 05:51)

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