Grazie mille!
Non sapevo che ogni mia foto creava tutta questa mole di informazioni!
(questa è l'informazione da me ricercata [DateTimeOriginal])

#######################

[FileName] => php38B.tmp
[FileDateTime] => 1255886017
[FileSize] => 732036 [FileType] => 2
[MimeType] => image/jpeg
[SectionsFound] => ANY_TAG, IFD0,
THUMBNAIL, EXIF, INTEROP
[COMPUTED] => Array (
[html] => width="2560" height="1920"
[Height] => 1920
[Width] => 2560
[IsColor] => 1
[ByteOrderMotorola] => 0
[ApertureFNumber] => f/2.8
[UserComment] =>
[UserCommentEncoding] => UNDEFINED
[Copyright] => Copyright 2006
[Thumbnail.FileType] => 2
[Thumbnail.MimeType] => image/jpeg )
[ImageDescription] => [Make] => NIKON
[Model] => COOLPIX L10
[Orientation] => 1
[XResolution] => 3000000/10000
[YResolution] => 3000000/10000
[ResolutionUnit] => 2
[Software] => Adobe Photoshop CS4 Windows
[DateTime] => 2009:10:16 15:12:40
[YCbCrPositioning] => 2
[Copyright] => Copyright 2006
[Exif_IFD_Pointer] => 268
[THUMBNAIL] => Array ( [Compression] => 6 [XResolution] => 72/1 [YResolution] => 72/1 [ResolutionUnit] => 2 [JPEGInterchangeFormat] => 934 [JPEGInterchangeFormatLength] => 7725 )
[ExposureTime] => 10/2728
[FNumber] => 28/10
[ExposureProgram] => 2
[ISOSpeedRatings] => 64
[ExifVersion] => 0220
[DateTimeOriginal] => 2007:05:13 16:45:11
[DateTimeDigitized] => 2007:05:13 16:45:11
[ComponentsConfiguration] => �
[CompressedBitsPerPixel] => 4/1
[ExposureBiasValue] => 0/10
[MaxApertureValue] => 30/10
[MeteringMode] => 5
[LightSource] => 0
[Flash] => 16 [FocalLength] => 6200/1000
[UserComment] => �������� �
[FlashPixVersion] => 0100
[ColorSpace] => 1
[ExifImageWidth] => 2560
[ExifImageLength] => 1920
[InteroperabilityOffset] => 808
[SensingMethod] => 2
[FileSource] => 
[SceneType] => 
[CustomRendered] => 0
[ExposureMode] => 0
[WhiteBalance] => 0
[DigitalZoomRatio] => 0/100
[FocalLengthIn35mmFilm] => 37
[SceneCaptureType] => 0
[GainControl] => 1 [Contrast] => 0
[Saturation] => 0 [Sharpness] => 0
[SubjectDistanceRange] => 0
[InterOperabilityIndex] => R98
[InterOperabilityVersion] => 0100 )