我尝试了各种方法来解析下面的json，但它对我不起作用。它返回空白。例如，我将如何检索SourceFile名称"example.jpg"或文件大小并将其存储为变量？谢谢
[
{
"SourceFile": "example.jpg",
"ExifTool": {
"ExifToolVersion": 9.04
},
"File": {
"FileName": "example.jpg",
"Directory": ".",
"FileSize": "323 kB",
"FileModifyDate": "2013:10:17 11:10:21-04:00",
"FileAccessDate": "2013:12:10 11:47:49-05:00",
"FilePermissions": "rwxrwxrwx",
"FileType": "JPEG",
"MIMEType": "image/jpeg",
"ImageWidth": 1000,
"ImageHeight": 658,
"EncodingProcess": "Progressive DCT, Huffman coding",
"BitsPerSample": 8,
"ColorComponents": 3,
"YCbCrSubSampling": "YCbCr4:4:4 (1 1)"
},
"JFIF": {
"JFIFVersion": 1.02,
"ResolutionUnit": "None",
"XResolution": 100,
"YResolution": 100
},
"Ducky": {
"Quality": "95%"
},
"XMP": {
"XMPToolkit": "Adobe XMP Core 4.2.2-c063 53.352624, 2008/07/30-18:12:18 ",
"Make": "Canon",
"Model": "Canon EOS 40D",
"XResolution": 240,
"YResolution": 240,
"ResolutionUnit": "inches",
"ExifVersion": "0221",
"ExposureTime": "1/1000",
"ShutterSpeedValue": "1/1000",
"FNumber": 8,
"ApertureValue": 8,
"ExposureProgram": "Aperture-priority AE",
"DateTimeOriginal": "2013:09:27 13:03:40.00+01:00",
"DateTimeDigitized": "2013:09:27 13:03:40.00+01:00",
"ExposureCompensation": "-2/3",
"MaxApertureValue": 4,
"SubjectDistance": "5.19 m",
"MeteringMode": "Multi-segment",
"FocalLength": "500.0 mm",
"CustomRendered": "Normal",
"ExposureMode": "Auto",
"WhiteBalance": "Auto",
"SceneCaptureType": "Standard",
"FocalPlaneXResolution": 4438.35616438356,
"FocalPlaneYResolution": 4445.96912521441,
"FocalPlaneResolutionUnit": "inches",
"ExifImageWidth": 3888,
"ExifImageHeight": 2592,
"ModifyDate": "2013:09:27 13:03:40.00+01:00",
"CreateDate": "2013:09:27 13:03:40.00+01:00",
"Rating": 0,
"MetadataDate": "2013:09:27 13:03:40.00+01:00",
"SerialNumber": 1130502837,
"LensInfo": "500mm f/?",
"Lens": "EF500mm f/4L IS USM",
"LensID": 143,
"ImageNumber": 0,
"FlashCompensation": 0,
"OwnerName": "Derek Lees WS66JU",
"Firmware": "1.1.1",
"Format": "image/tiff",
"PreservedFileName": "IMG_8987.CR2",
"SidecarForExtension": "CR2",
"ColorMode": "RGB",
"ISO": 400,
"FlashFired": false,
"FlashReturn": "No return detection",
"FlashMode": "Off",
"FlashFunction": false,
"FlashRedEyeMode": false,
"Creator": [
"Derek Lees WS66JU",
"Derek Lees"
],
"Rights": "© Derek Lees 2013",
"HistoryAction": "converted",
"HistoryParameters": "from image/tiff to image/jpeg"
},
"APP14": {
"DCTEncodeVersion": 100,
"APP14Flags0": "[14], Encoded with Blend=1 downsampling",
"APP14Flags1": "(none)",
"ColorTransform": "YCbCr"
},
"Composite": {
"Aperture": 8,
"Flash": "Off, Did not fire",
"ImageSize": "1000x658",
"ScaleFactor35efl": 1.6,
"ShutterSpeed": "1/1000",
"CircleOfConfusion": "0.019 mm",
"DOF": "0.03 m (5.18 - 5.20)",
"FOV": "2.5 deg",
"FocalLength35efl": "500.0 mm (35 mm equivalent: 809.4 mm)",
"HyperfocalDistance": "1683.65 m",
"LensID": "Canon EF 500mm f/4L IS",
"LightValue": 14
}
}
]
由于您提到了PHP，PHP中的json_decode函数会将json解码为多级对象（或数组）。从那里，您可以使用foreach或直接命名数组/对象部分来获得所需的数据。