PHP Unconference Europe 2015

fdf_get_value

(PHP 4, PHP 5)

fdf_get_valueObtener el valor de un campo

Descripción

mixed fdf_get_value ( resource $fdf_document , string $fieldname [, int $which = -1 ] )

Obtiene el valor del campo solicitado.

Parámetros

fdf_document

El gestor de documento FDF, devuelto por fdf_create(), fdf_open() o fdf_open_string().

fieldname

Nombre del campo FDF, como una cadena.

which

Los elementos de un campo tipo matriz pueden ser recuperados pasando este parámetro opcional, comenzando desde cero. Para campos que no son matrices, este parámetro será ignorado.

Valores devueltos

Devuelve el valor del campo.

Historial de cambios

Versión Descripción
4.3.0 El soporte para matrices y el parámetro cuales fue agregado.

Ver también

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User Contributed Notes 1 note

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mclinden at informed dot net
12 years ago
(i filed a bug report/feature request for this on bugs.php.net and assigned it to myself hartmut@php.net)

The default behavior for the FDF Toolkit is to return an FDFErcNoValue for the FDFGetValue when the field exists but has no value.

Whether or not this is truly an error is debateable. It seems to become an issue in documents created by Acrobat 5 when optional fields are included in a form with required fields since the default behavior seems to be to populate the HTTP_FDF_DATA with the results of the FDFNextFieldName enumerator, which would include the fields which have no value.

This would not be a problem except that the PHP function fdf_get_value() does not specifically test for the FDFErcNoValue condition but, instead, tests for the more general FDFErcOK. If this value is not the result of the error code, the system issues warnings (the display of which could be turned off), but the broader question is, should this be a warning condition at all?

Put another way, should a return of FDFErcNoValue for FDFGetValue be considered an event worth generating a warning?
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