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Document read_exif_data

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git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@29854 c90b9560-bf6c-de11-be94-00142212c4b1
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Rasmus Lerdorf 2000-08-07 21:45:15 +00:00
parent d57ccad6e7
commit 2cb3d797cc
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70
functions/image.xml
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@ -2108,6 +2108,76 @@ if (ImageTypes() & IMG_PNG) {
</para>
</refsect1>
</refentry>
<refentry id="function.read_exif_data">
<refnamediv>
<refname>read_exif_data</refname>
<refpurpose>Read the EXIF headers from a JPEG</refpurpose>
</refnamediv>
<refsect1>
<title>Description</title>
<funcsynopsis>
<funcprototype>
<funcdef>array <function>read_exif_data</function></funcdef>
<paramdef>string <parameter>filename</parameter></paramdef>
</funcprototype>
</funcsynopsis>
<para>
The <function>read_exif_data</function> function reads the
EXIF headers from a JPEG image file. It returns an associative
array where the indeces are the Exif header names and the values
are the values associated with those Exif headers. Exif headers
tend to be present in JPEG 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.
<example>
<title>read_exif_data</title>
<programlisting role="php">
&lt;?php
$exif = read_exif_data ('p0001807.jpg');
while(list($k,$v)=each($exif)) {
echo "$k: $v&lt;br>\n";
}
?>
Output:
FileName: p0001807.jpg
FileDateTime: 929353056
FileSize: 378599
CameraMake: Eastman Kodak Company
CameraModel: KODAK DC265 ZOOM DIGITAL CAMERA (V01.00)
DateTime: 1999:06:14 01:37:36
Height: 1024
Width: 1536
IsColor: 1
FlashUsed: 0
FocalLength: 8.0mm
RawFocalLength: 8
ExposureTime: 0.004 s (1/250)
RawExposureTime: 0.0040000001899898
ApertureFNumber: f/ 9.5
RawApertureFNumber: 9.5100002288818
FocusDistance: 16.66m
RawFocusDistance: 16.659999847412
Orientation: 1
ExifVersion: 0200
</programlisting>
</example>
</para>
<para>
<note>
<simpara>
This function is only available in PHP4 compiled using --enable-exif
</simpara>
<simpara>
This function does not require the GD image library.
</simpara>
</note>
</para>
</refsect1>
</refentry>
</reference>
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