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POPHP associative multidimentional array - print only selected keys
 

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    <p>I have an array that is taken from an image using </p> <pre><code>exif_read_data($image, 0, true) </code></pre> <p>The array itself can contain an unknown number of keys/values (can also be 0) The array is also Multidimentional in some parts.</p> <p>An example of an array from exif_read_data :</p> <pre><code>Array ( [FILE] =&gt; Array ( [FileName] =&gt; f-20110129_004_pp.jpg [FileDateTime] =&gt; 0 [FileSize] =&gt; 3566966 [FileType] =&gt; 2 [MimeType] =&gt; image/jpeg [SectionsFound] =&gt; ANY_TAG, IFD0, THUMBNAIL, EXIF, GPS ) [COMPUTED] =&gt; Array ( [html] =&gt; width="2576" height="1936" [Height] =&gt; 1936 [Width] =&gt; 2576 [IsColor] =&gt; 1 [ByteOrderMotorola] =&gt; 0 [ApertureFNumber] =&gt; f/2.8 [Thumbnail.FileType] =&gt; 2 [Thumbnail.MimeType] =&gt; image/jpeg ) [IFD0] =&gt; Array ( [ImageWidth] =&gt; 2576 [ImageLength] =&gt; 1936 [BitsPerSample] =&gt; Array ( [0] =&gt; 8 [1] =&gt; 8 [2] =&gt; 8 ) [Make] =&gt; Nokia [Model] =&gt; N900 [Orientation] =&gt; 1 [SamplesPerPixel] =&gt; 3 [XResolution] =&gt; 3000000/10000 [YResolution] =&gt; 3000000/10000 [ResolutionUnit] =&gt; 2 [Software] =&gt; Adobe Photoshop CS5 Windows [DateTime] =&gt; 2011:01:29 09:37:30 [YCbCrPositioning] =&gt; 1 [Exif_IFD_Pointer] =&gt; 276 [GPS_IFD_Pointer] =&gt; 658 ) [THUMBNAIL] =&gt; Array ( [Compression] =&gt; 6 [XResolution] =&gt; 72/1 [YResolution] =&gt; 72/1 [ResolutionUnit] =&gt; 2 [JPEGInterchangeFormat] =&gt; 978 [JPEGInterchangeFormatLength] =&gt; 5525 ) [EXIF] =&gt; Array ( [ExposureTime] =&gt; 1/500 [FNumber] =&gt; 14/5 [ExposureProgram] =&gt; 0 [ISOSpeedRatings] =&gt; 100 [ExifVersion] =&gt; 0210 [DateTimeOriginal] =&gt; 2011:01:29 09:37:30 [DateTimeDigitized] =&gt; 2011:01:29 09:37:30 [ShutterSpeedValue] =&gt; 8/1 [ApertureValue] =&gt; 297/100 [LightSource] =&gt; 0 [Flash] =&gt; 0 [FocalLength] =&gt; 26/5 [FlashPixVersion] =&gt; 0100 [ColorSpace] =&gt; 1 [ExifImageWidth] =&gt; 2576 [ExifImageLength] =&gt; 1936 [CustomRendered] =&gt; 0 [ExposureMode] =&gt; 0 [WhiteBalance] =&gt; 0 [DigitalZoomRatio] =&gt; 1/1 [SceneCaptureType] =&gt; 0 [GainControl] =&gt; 0 [Contrast] =&gt; 0 [Saturation] =&gt; 0 ) [GPS] =&gt; Array ( [GPSVersion] =&gt; [GPSLatitudeRef] =&gt; N [GPSLatitude] =&gt; Array ( [0] =&gt; 22/1 [1] =&gt; 12937/1000 [2] =&gt; 0/1 ) [GPSLongitudeRef] =&gt; E [GPSLongitude] =&gt; Array ( [0] =&gt; 113/1 [1] =&gt; 32886/1000 [2] =&gt; 0/1 ) [GPSAltitudeRef] =&gt; [GPSAltitude] =&gt; 255/1 [GPSTimeStamp] =&gt; Array ( [0] =&gt; 9/1 [1] =&gt; 37/1 [2] =&gt; 30/1 ) [GPSMapDatum] =&gt; WGS-84 [GPSDateStamp] =&gt; 2011:01:29 ) ) </code></pre> <p>My question is how can I create a function that will display only the keys that I select , as a key/value pair , even if it is in the 2nd, or 3rd dimension of the array?</p> <p>for example - from the array above , if I want to select only the <code>[ImageWidth] , [ImageLength] , [XResolution] , [GPSTimeStamp] and [GPSLatitude] ..</code></p> <p>I would pass it to the function like :</p> <pre><code>$keys_array = (ImageWidth , ImageLength, XResolution, GPSTimeStamp , GPSLatitude) </code></pre> <p>and then </p> <pre><code>function select_keys_from_array ($keys_array='') { // if $keys_array=='' then get all .. //identify the dimension or flatten - and get only my keys and display key/value } </code></pre> <p>I have selected those keys as example because some of them are on a second-level, and some are actually arrays themselves ..</p> <p>There is also a problem is that the keys can theoretically be duplicated (user-keys) - but residing in different second-level array (and therefor not nominally duplicated.)</p> <p>I guess I will need to "flatten" it first , and then to "pass" an array of my wanted keys somehow - but I can not really seem to get it right .</p> <p>Does someone knows any ready-made class / function / snippet for that sort of thing ?</p>
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    1. COYou should use a function that loops through the tree recursively. The condition of return it should be located recurisvidad the key passed as parameter.
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    2. COTry recursion...
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