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><H1
><A
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>exif_read_data</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN44679"
></A
><P
> (PHP 4 >= 4.2.0, PHP 5)</P
>exif_read_data -- Reads the <ACRONYM
CLASS="acronym"
>EXIF</ACRONYM
> headers from <ACRONYM
CLASS="acronym"
>JPEG</ACRONYM
> or <ACRONYM
CLASS="acronym"
>TIFF</ACRONYM
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN44685"
></A
><H2
>Descrição</H2
>array <B
CLASS="methodname"
>exif_read_data</B
> ( string filename [, string sections [, bool arrays [, bool thumbnail]]] )<BR
></BR
><P
> <B
CLASS="function"
>exif_read_data()</B
> reads the
<ACRONYM
CLASS="acronym"
>EXIF</ACRONYM
> headers from a <ACRONYM
CLASS="acronym"
>JPEG</ACRONYM
> or
<ACRONYM
CLASS="acronym"
>TIFF</ACRONYM
> image file. This way you can read meta data
generated by digital cameras.
</P
><P
> Exif headers tend to be present in JPEG/TIFF images generated by digital
cameras, but unfortunately each digital camera maker has a different
idea of how to actually tag their images, so you can't always rely on
a specific Exif header being present.
</P
><P
> <TT
CLASS="literal"
>Height</TT
> and <TT
CLASS="literal"
>Width</TT
> are computed the
same way <A
HREF="function.getimagesize.html"
><B
CLASS="function"
>getimagesize()</B
></A
> does so their values must not be
part of any header returned. Also, <TT
CLASS="literal"
>html</TT
> is a
height/width text string to be used inside normal <ACRONYM
CLASS="acronym"
>HTML</ACRONYM
>.
</P
><P
> When an Exif header contains a Copyright note, this itself can contain two
values. As the solution is inconsistent in the Exif 2.10 standard, the COMPUTED
section will return both entries <TT
CLASS="literal"
>Copyright.Photographer</TT
>
and <TT
CLASS="literal"
>Copyright.Editor</TT
> while the IFD0 sections contains
the byte array with the NULL character that splits both entries. Or just the
first entry if the datatype was wrong (normal behaviour of Exif). The
COMPUTED will also contain the entry <TT
CLASS="literal"
>Copyright</TT
> which
is either the original copyright string, or a comma separated list of the
photo and editor copyright.
</P
><P
> The tag UserComment has the same problem as the Copyright tag. It can store
two values. First the encoding used, and second the value itself. If so the
IFD section only contains the encoding or a byte array. The COMPUTED section
will store both in the entries <TT
CLASS="literal"
>UserCommentEncoding</TT
> and
<TT
CLASS="literal"
>UserComment</TT
>. The entry <TT
CLASS="literal"
>UserComment</TT
>
is available in both cases so it should be used in preference to the value
in IFD0 section.
</P
><P
> <B
CLASS="function"
>exif_read_data()</B
> also validates EXIF data tags according
to the EXIF specification (<A
HREF="http://exif.org/Exif2-2.PDF"
TARGET="_top"
>http://exif.org/Exif2-2.PDF</A
>, page 20).
</P
><DIV
CLASS="note"
><BLOCKQUOTE
CLASS="note"
><P
><B
>Nota: </B
>
Windows ME/XP can both wipe the Exif headers when connecting to a camera.
More information available at <A
HREF="http://www.canon.co.jp/Imaging/NOTICE/011214-e.html"
TARGET="_top"
>http://www.canon.co.jp/Imaging/NOTICE/011214-e.html</A
>.
</P
></BLOCKQUOTE
></DIV
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN44728"
></A
><H2
>Parâmetros</H2
><P
> <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>filename</CODE
></DT
><DD
><P
> The name of the image file being read. This cannot be an
<ACRONYM
CLASS="acronym"
>URL</ACRONYM
>.
</P
></DD
><DT
><CODE
CLASS="parameter"
>sections</CODE
></DT
><DD
><P
> Is a comma separated list of sections that need to be present in file
to produce a result <A
HREF="language.types.array.html"
><B
CLASS="type"
>array</B
></A
>. If none of the requested
sections could be found the return value is <TT
CLASS="constant"
><B
>FALSE</B
></TT
>.
<DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN44745"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><TBODY
><TR
><TD
>FILE</TD
><TD
>FileName, FileSize, FileDateTime, SectionsFound</TD
></TR
><TR
><TD
>COMPUTED</TD
><TD
> html, Width, Height, IsColor, and more if available. Height and
Width are computed the same way <A
HREF="function.getimagesize.html"
><B
CLASS="function"
>getimagesize()</B
></A
>
does so their values must not be part of any header returned.
Also, html is a height/width text string to be used inside normal
<ACRONYM
CLASS="acronym"
>HTML</ACRONYM
>.
</TD
></TR
><TR
><TD
>ANY_TAG</TD
><TD
>Any information that has a Tag e.g. IFD0, EXIF, ...</TD
></TR
><TR
><TD
>IFD0</TD
><TD
> All tagged data of IFD0. In normal imagefiles this contains
image size and so forth.
</TD
></TR
><TR
><TD
>THUMBNAIL</TD
><TD
> A file is supposed to contain a thumbnail if it has a second IFD.
All tagged information about the embedded thumbnail is stored in
this section.
</TD
></TR
><TR
><TD
>COMMENT</TD
><TD
>Comment headers of JPEG images.</TD
></TR
><TR
><TD
>EXIF</TD
><TD
> The EXIF section is a sub section of IFD0. It contains
more detailed information about an image. Most of these entries
are digital camera related.
</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
</P
></DD
><DT
><CODE
CLASS="parameter"
>arrays</CODE
></DT
><DD
><P
> Specifies whether or not each section becomes an array. The
<CODE
CLASS="parameter"
>sections</CODE
> <TT
CLASS="literal"
>COMPUTED</TT
>,
<TT
CLASS="literal"
>THUMBNAIL</TT
>, and <TT
CLASS="literal"
>COMMENT</TT
>
always become arrays as they may contain values whose names conflict
with other sections.
</P
></DD
><DT
><CODE
CLASS="parameter"
>thumbnail</CODE
></DT
><DD
><P
> When set to <TT
CLASS="constant"
><B
>TRUE</B
></TT
> the thumbnail itself is read. Otherwise, only the
tagged data is read.
</P
></DD
></DL
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN44786"
></A
><H2
>Valores de retornado</H2
><P
> It returns an associative <A
HREF="language.types.array.html"
><B
CLASS="type"
>array</B
></A
> where the array indexes are
the header names and the array values are the values associated with
those headers. If no data can be returned,
<B
CLASS="function"
>exif_read_data()</B
> will return <TT
CLASS="constant"
><B
>FALSE</B
></TT
>.
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN44792"
></A
><H2
>Histórico</H2
><P
> <DIV
CLASS="informaltable"
><P
></P
><A
NAME="AEN44795"
></A
><TABLE
BORDER="1"
CLASS="CALSTABLE"
><COL><COL><THEAD
><TR
><TH
>Versão</TH
><TH
>Descrição</TH
></TR
></THEAD
><TBODY
><TR
><TD
>4.3.0</TD
><TD
> Can read all embedded <ACRONYM
CLASS="acronym"
>IFD</ACRONYM
> data including arrays
(returned as such). Also the size of an embedded thumbnail is
returned in a <TT
CLASS="literal"
>THUMBNAIL</TT
> subarray, and can
return thumbnails in <ACRONYM
CLASS="acronym"
>TIFF</ACRONYM
> format. Also, there is
no longer a maximum length for returned values (not until the memory
limit has been reached)
</TD
></TR
><TR
><TD
>4.3.0</TD
><TD
> If PHP has <A
HREF="ref.mbstring.html"
>mbstring</A
> support,
the user comment can automatically change encoding. Also, if the
user comment uses Unicode or JIS encoding this encoding will
automatically be changed according to the exif ini settings in
<TT
CLASS="filename"
>php.ini</TT
>
</TD
></TR
><TR
><TD
>4.3.0</TD
><TD
> If the image contains any IFD0 data then COMPUTED contains the entry
ByteOrderMotorola which is 0 for little-endian (intel) and 1 for
big-endian (motorola) byte order. Also, COMPUTED and UserComment no
longer only contain the first copyright entry if the datatype was
wrong.
</TD
></TR
></TBODY
></TABLE
><P
></P
></DIV
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN44816"
></A
><H2
>Exemplos</H2
><P
> <TABLE
WIDTH="100%"
BORDER="0"
CELLPADDING="0"
CELLSPACING="0"
CLASS="EXAMPLE"
><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN44819"
></A
><P
><B
>Exemplo 1. <B
CLASS="function"
>exif_read_data()</B
> example</B
></P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
<font color="#0000BB"><?php<br /></font><font color="#007700">echo </font><font color="#DD0000">"test1.jpg:<br />\n"</font><font color="#007700">;<br /></font><font color="#0000BB">$exif </font><font color="#007700">= </font><font color="#0000BB">exif_read_data</font><font color="#007700">(</font><font color="#DD0000">'tests/test1.jpg'</font><font color="#007700">, </font><font color="#DD0000">'IFD0'</font><font color="#007700">);<br />echo </font><font color="#0000BB">$exif</font><font color="#007700">===</font><font color="#0000BB">false </font><font color="#007700">? </font><font color="#DD0000">"No header data found.<br />\n" </font><font color="#007700">: </font><font color="#DD0000">"Image contains headers<br />\n"</font><font color="#007700">;<br /><br /></font><font color="#0000BB">$exif </font><font color="#007700">= </font><font color="#0000BB">exif_read_data</font><font color="#007700">(</font><font color="#DD0000">'tests/test2.jpg'</font><font color="#007700">, </font><font color="#0000BB">0</font><font color="#007700">, </font><font color="#0000BB">true</font><font color="#007700">);<br />echo </font><font color="#DD0000">"test2.jpg:<br />\n"</font><font color="#007700">;<br />foreach (</font><font color="#0000BB">$exif </font><font color="#007700">as </font><font color="#0000BB">$key </font><font color="#007700">=> </font><font color="#0000BB">$section</font><font color="#007700">) {<br /> foreach (</font><font color="#0000BB">$section </font><font color="#007700">as </font><font color="#0000BB">$name </font><font color="#007700">=> </font><font color="#0000BB">$val</font><font color="#007700">) {<br /> echo </font><font color="#DD0000">"$key.$name: $val<br /></font><font color="#007700">\n</font><font color="#DD0000">"</font><font color="#007700">;<br /> }<br />}<br /></font><font color="#0000BB">?></font>
</font>
</code></TD
></TR
></TABLE
><P
> The first call fails because the image has no header information.
</P
><P
>O exemplo acima irá imprimir
algo similar a:</P
><TABLE
BORDER="0"
BGCOLOR="#E0E0E0"
CELLPADDING="5"
><TR
><TD
><code><font color="#000000">
test1.jpg:<br />No header data found.<br />test2.jpg:<br />FILE.FileName: test2.jpg<br />FILE.FileDateTime: 1017666176<br />FILE.FileSize: 1240<br />FILE.FileType: 2<br />FILE.SectionsFound: ANY_TAG, IFD0, THUMBNAIL, COMMENT<br />COMPUTED.html: width="1" height="1"<br />COMPUTED.Height: 1<br />COMPUTED.Width: 1<br />COMPUTED.IsColor: 1<br />COMPUTED.ByteOrderMotorola: 1<br />COMPUTED.UserComment: Exif test image.<br />COMPUTED.UserCommentEncoding: ASCII<br />COMPUTED.Copyright: Photo (c) M.Boerger, Edited by M.Boerger.<br />COMPUTED.Copyright.Photographer: Photo (c) M.Boerger<br />COMPUTED.Copyright.Editor: Edited by M.Boerger.<br />IFD0.Copyright: Photo (c) M.Boerger<br />IFD0.UserComment: ASCII<br />THUMBNAIL.JPEGInterchangeFormat: 134<br />THUMBNAIL.JPEGInterchangeFormatLength: 523<br />COMMENT.0: Comment #1.<br />COMMENT.1: Comment #2.<br />COMMENT.2: Comment #3end<br />THUMBNAIL.JPEGInterchangeFormat: 134<br />THUMBNAIL.Thumbnail.Height: 1<br />THUMBNAIL.Thumbnail.Height: 1</font>
</code></TD
></TR
></TABLE
></DIV
></TD
></TR
></TABLE
>
</P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN44826"
></A
><H2
>Veja também</H2
><P
> <P
></P
><TABLE
BORDER="0"
><TBODY
><TR
><TD
><A
HREF="function.exif-thumbnail.html"
><B
CLASS="function"
>exif_thumbnail()</B
></A
></TD
></TR
><TR
><TD
><A
HREF="function.getimagesize.html"
><B
CLASS="function"
>getimagesize()</B
></A
></TD
></TR
></TBODY
></TABLE
><P
></P
>
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