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                <title>The PHP JPEG Metadata Toolkit - Documentation</title>
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                        <H1 align="center" style="padding:15">The PHP JPEG Metadata Toolkit - Documentation</H1>
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                <a href="examples.html">Go to Documentation - Examples</a>

                <div class="maintext">

                <h2>Example Photoshop &quot;File Info&quot; Editor Scripts</h2>

                <p>
                        These two example scripts areincluded with the PHP JPEG Metadata Toolkit.
                        They show how the library can be used to edit metadata over the internet
                        in exactly the same format as Photoshop&quot;s &quot;File Info&quot; dialog box.
                        This is an explanation of some of the commands used in the script.
                </p>

                <a href="http://www.ozhiker.com/electronics/pjmt/library/list_contents.php4?filename=Edit_File_Info_Example.php">
                        Click here to see the Edit_File_Info_Example.php</a>
                <br><br>
                <a href="http://www.ozhiker.com/electronics/pjmt/library/list_contents.php4?filename=Write_File_Info.php">
                        Click here to see the Write_File_Info.php</a>
                <br>

                <br>
                <br>
                <br>

                <h2>Edit_File_Info_Example.php</h2>

                <h4>Overview</h4>
                <p>
                        This script utilises another script called Edit_File_Info.php.<br />
                        Edit_File_Info.php outputs the HTML required to display a HTML form which emulates
                        the Photoshop &quot;File Info&quot; dialog box.
                </p>
                <p>
                        Edit_File_Info.php has four modes of operation:
                </p>
                <ol>
                        <li>
                                If $new_ps_file_info_array is defined then it's data will be used
                                to fill the fields.
                        </li>
                        <li>
                                If $new_ps_file_info_array is not defined but $filename is
                                defined, then the file info fields will be filled from the
                                metadata in the file specified
                        </li>
                        <li>
                                If $new_ps_file_info_array is not defined but $filename
                                and $default_ps_file_info_array are defined, then the
                                file info fields will be filled from the metadata in the
                                file specified, but where fields are blank, they will be
                                filled from $default_ps_file_info_array
                        </li>
                        <li>
                                Otherwise the fields will be blank
                        </li>
                </ol>




                <br>
                <br>

                <h4>Forced Field Values</h4>

                <p>
                        If the variable $new_ps_file_info_array before Edit_File_Info.php is included, then it
                        forces the values of the fields to be loaded from $new_ps_file_info_array
                </p>

                <p>
                        <b>NOTE:</b>
                        <ul>
                                <li>date must be in YYYY-MM-DD format</li>
                                <li>coyrightstatus must be either "Copyrighted Work", "Public Domain", or "Unknown"</li>
                                <li>urgency must be a single digit between 1 and 8 inclusive</li>
                                <li>category must be 3 characters or less</li>
                                <li>authors position is not used in Photoshop 7 or higher</li>
                                <li>jobname is not used in Photoshop CS or higher</li>
                        </ul>
                </p>

                <p>Here is some example code for defining $new_ps_file_info_array</p>
                <pre style="color:brown">
                        $new_ps_file_info_array = array (
                                                                'title'                 => "Frenchmans Cap",
                                                                'author'                => "Evan Hunter",
                                                                'authorsposition'       => "",
                                                                'caption'               => "A view of Frenchmans cap from a bus on the Lyell Highway",
                                                                'captionwriter'         => "Evan Hunter",
                                                                'jobname'               => "",
                                                                'copyrightstatus'       => "Copyrighted Work",
                                                                'copyrightnotice'       => "Copyright (c) Evan Hunter 2004",
                                                                'ownerurl'              => "http://www.ozhiker.com",
                                                                'keywords'              => array( "Frenchmans Cap", "Franklin Gordon National Park", "Tasmania" ),
                                                                'category'              => "abc",
                                                                'supplementalcategories'=> array( "Supp Category1", "Supp Category2" ),
                                                                'date'                  => "2004-05-11",
                                                                'city'                  => "Franklin Gordon National Park",
                                                                'state'                 => "Tasmania",
                                                                'country'               => "Australia",
                                                                'credit'                => "Evan Hunter",
                                                                'source'                => "Evan Hunter",
                                                                'headline'              => "Frenchmans Cap from Lyell Highway",
                                                                'instructions'          => "No Instructions",
                                                                'transmissionreference' => "12345",
                                                                'urgency'               => "3"
                                                                );
                </pre>

                <br>
                <br>


                <h4>Default Field Values</h4>

                <p>
                        The variable $default_ps_file_info_array sets the default values of the File Info fields.
                        These are only loaded into the fields where File Info has been loaded from a file, but
                        the fields in question are still blank. It has similar definition requirements to $new_ps_file_info_array.
                </p>

                <pre style="color:brown">
                        // Define defaults for the fields - These are only used where the image has blank fields
                        $default_ps_file_info_array = array (
                                                                'title'                 => "",
                                                                'author'                => "Evan Hunter",
                                                                'authorsposition'       => "",
                                                                'caption'               => "",
                                                                'captionwriter'         => "Evan Hunter",
                                                                'jobname'               => "",
                                                                'copyrightstatus'       => "Copyrighted Work",
                                                                'copyrightnotice'       => "Copyright (c) Evan Hunter 2004",
                                                                'ownerurl'              => "http://www.ozhiker.com",
                                                                'keywords'              => array(),
                                                                'category'              => "",
                                                                'supplementalcategories'=> array(),
                                                                'date'                  => "",
                                                                'city'                  => "",
                                                                'state'                 => "Tasmania",
                                                                'country'               => "Australia",
                                                                'credit'                => "Evan Hunter",
                                                                'source'                => "Evan Hunter",
                                                                'headline'              => "",
                                                                'instructions'          => "",
                                                                'transmissionreference' => "",
                                                                'urgency'               => ""
                                                                );
                </pre>

                <br>
                <br>

                <h4>Input Filename</h4>
                <p>
                        When the $filename variable is defined before the inclusion of Edit_File_Info.php, it defines
                        which JPEG file should be searched to fill the File Info fields
                </p>
                <pre style="color:brown">
                        $filename = "test.jpg";
                </pre>

                <br>
                <br>

                <h4>Output Filename</h4>
                <p>
                        The $outputfilename variable must always be defined before the inclusion of Edit_File_Info.php.
                        It defines the target image which will be modified with the information that the user enters.
                        It can be the same as $filename.
                </p>
                <pre style="color:brown">
                        $outputfilename = "test.jpg";
                </pre>

                <h4>Including Edit_File_Info.php</h4>
                <p>
                        After $outputfilename has been defined, and any of the other variables have been defined as required,
                        Edit_File_Info.php should be included. It outputs the HTML for the File Info Editor.
                </p>
                <pre style="color:brown">
                        include "Edit_File_Info.php";
                </pre>

                <br>
                <br>


                <h2>Write_File_Info.php</h2>
                <h4>Overview</h4>
                <p>
                        This script receives the File Info data from the user via the HTML POST method.<br />
                </p>


                <h4>Retrieving the POSTed variables</h4>
                <p>
                        The field data is retrieved as follows:
                </p>
                <pre style="color:brown">
                        $new_ps_file_info_array = $GLOBALS['HTTP_POST_VARS'];
                </pre>

                <br>
                <br>

                <h4>Preparing the field data</h4>
                <p>
                        The POSTed field data has some characters escaped with backslashes, which need to be removed.
                        Two of the fields should also be arrays which and need to be split.
                </p>
                <pre style="color:brown">
                        // Some characters are escaped with backslashes in HTML Posted variable
                        // Cycle through each of the HTML Posted variables, and strip out the slashes
                        foreach( $new_ps_file_info_array as $var_key => $var_val )
                        {
                                $new_ps_file_info_array[ $var_key ] = stripslashes( $var_val );
                        }

                        // Keywords should be an array - explode it on newline boundarys
                        $new_ps_file_info_array[ 'keywords' ] = explode( "\n", trim( $new_ps_file_info_array[ 'keywords' ] ) );

                        // Supplemental Categories should be an array - explode it on newline boundarys
                        $new_ps_file_info_array[ 'supplementalcategories' ] = explode( "\n", trim( $new_ps_file_info_array[ 'supplementalcategories' ] ) );
                </pre>

                <br>
                <br>

                <h4>Writing the File Info</h4>
                <p>
                        Now the File Info data can be written to a file. The following code results in
                        the $jpeg_header_data being updated with the new Photoshop File Info, and it can
                        then be written to a JPEG file as normal using put_jpeg_header_data:
                </p>
                <pre style="color:brown">
                        // Retrieve the header information
                        $jpeg_header_data = get_jpeg_header_data( $filename );

                        // Retreive the EXIF, XMP and Photoshop IRB information from
                        // the existing file, so that it can be updated
                        $Exif_array = get_EXIF_JPEG( $filename );
                        $XMP_array = read_XMP_array_from_text( get_XMP_text( $jpeg_header_data ) );
                        $IRB_array = get_Photoshop_IRB( $jpeg_header_data );

                        // Update the JPEG header information with the new Photoshop File Info
                        $jpeg_header_data = put_photoshop_file_info( $jpeg_header_data, $new_ps_file_info_array, $Exif_array, $XMP_array, $IRB_array );
                </pre>

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                <br>



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