我有以下代码：
$js = json_decode('{"points": [["39.67495589920286","19.799004793167114"],["39.69503584333047","19.854623079299927"],["39.700847368881","19.89471673965454"],["39.77054750039529","19.96612787246704"],["39.791127230787914","19.956514835357666"],["39.83121363626412","19.849398136138916"],["39.80800856647987","19.793779850006104"],["39.80167855121973","19.70726251602173"],["39.809063512364865","19.66881036758423"],["39.75154536393759","19.617998600006104"],["39.67284188119943","19.664690494537354"],["39.64059509088576","19.709322452545166"],["39.65645604812829","19.747774600982666"]],"meta": {"lat" : "39.60330292590828","lng" : "19.88315624618531","type" : "roadmap","zoom" : "11"}}');
echo "<pre>";
print_r($js);
echo "</pre>";
在http://writecodeonline.com/php/上，我的代码被正常解码，在我的本地PHP脚本中返回null。
此外，我只获得了json数据（以下的json）：
{
"points": [
[
"39.67495589920286",
"19.799004793167114"
],
[
"39.69503584333047",
"19.854623079299927"
],
[
"39.700847368881",
"19.89471673965454"
],
[
"39.77054750039529",
"19.96612787246704"
],
[
"39.791127230787914",
"19.956514835357666"
],
[
"39.83121363626412",
"19.849398136138916"
],
[
"39.80800856647987",
"19.793779850006104"
],
[
"39.80167855121973",
"19.70726251602173"
],
[
"39.809063512364865",
"19.66881036758423"
],
[
"39.75154536393759",
"19.617998600006104"
],
[
"39.67284188119943",
"19.664690494537354"
],
[
"39.64059509088576",
"19.709322452545166"
],
[
"39.65645604812829",
"19.747774600982666"
]
],
"meta": {
"lat" : "39.60330292590828",
"lng" : "19.88315624618531",
"type" : "roadmap",
"zoom" : "11"
}
}
并在http://jsonlint.com/和此处http://www.jsoneditoronline.org/验证它们以及它看起来没问题的代码。
同样在过去，我在我的代码中使用了相同的功能并且工作正常。
是否有必须为json_decode设置的选项？我可能做错了吗？我无法理解为什么：？
注意I：我的phpinfo（）会返回：
json support enabled
json version 1.2.1
注意II：今天我使用了这个函数http://aidanlister.com/2004/04/viewing-binary-data-as-a-hexdump-in-php/来获取我的数据的十六进制映射，数据如下：
0000 7b 26 71 75 6f 74 3b 70 6f 69 6e 74 73 26 71 75 {"p oints&qu
0010 6f 74 3b 3a 20 5b 5b 26 71 75 6f 74 3b 33 39 2e ot;: [[& quot;39.
0020 36 37 34 39 35 35 38 39 39 32 30 32 38 36 26 71 67495589 920286&q
0030 75 6f 74 3b 2c 26 71 75 6f 74 3b 31 39 2e 37 39 uot;,&qu ot;19.79
0040 39 30 30 34 37 39 33 31 36 37 31 31 34 26 71 75 90047931 67114&qu
0050 6f 74 3b 5d 2c 5b 26 71 75 6f 74 3b 33 39 2e 36 ot;],[&q uot;39.6
0060 39 35 30 33 35 38 34 33 33 33 30 34 37 26 71 75 95035843 33047&qu
0070 6f 74 3b 2c 26 71 75 6f 74 3b 31 39 2e 38 35 34 ot;,&quo t;19.854
0080 36 32 33 30 37 39 32 39 39 39 32 37 26 71 75 6f 62307929 9927&quo
0090 74 3b 5d 2c 5b 26 71 75 6f 74 3b 33 39 2e 37 30 t;],[&qu ot;39.70
00a0 30 38 34 37 33 36 38 38 38 31 26 71 75 6f 74 3b 08473688 81"
00b0 2c 26 71 75 6f 74 3b 31 39 2e 38 39 34 37 31 36 ,"1 9.894716
00c0 37 33 39 36 35 34 35 34 26 71 75 6f 74 3b 5d 2c 73965454 "],
00d0 5b 26 71 75 6f 74 3b 33 39 2e 37 37 30 35 34 37 ["3 9.770547
00e0 35 30 30 33 39 35 32 39 26 71 75 6f 74 3b 2c 26 50039529 ",&
00f0 71 75 6f 74 3b 31 39 2e 39 36 36 31 32 37 38 37 quot;19. 96612787
0100 32 34 36 37 30 34 26 71 75 6f 74 3b 5d 2c 5b 26 246704&q uot;],[&
0110 71 75 6f 74 3b 33 39 2e 37 39 31 31 32 37 32 33 quot;39. 79112723
0120 30 37 38 37 39 31 34 26 71 75 6f 74 3b 2c 26 71 0787914& quot;,&q
0130 75 6f 74 3b 31 39 2e 39 35 36 35 31 34 38 33 35 uot;19.9 56514835
0140 33 35 37 36 36 36 26 71 75 6f 74 3b 5d 2c 5b 26 357666&q uot;],[&
0150 71 75 6f 74 3b 33 39 2e 38 33 31 32 31 33 36 33 quot;39. 83121363
0160 36 32 36 34 31 32 26 71 75 6f 74 3b 2c 26 71 75 626412&q uot;,&qu
0170 6f 74 3b 31 39 2e 38 34 39 33 39 38 31 33 36 31 ot;19.84 93981361
0180 33 38 39 31 36 26 71 75 6f 74 3b 5d 2c 5b 26 71 38916&qu ot;],[&q
0190 75 6f 74 3b 33 39 2e 38 30 38 30 30 38 35 36 36 uot;39.8 08008566
01a0 34 37 39 38 37 26 71 75 6f 74 3b 2c 26 71 75 6f 47987&qu ot;,&quo
01b0 74 3b 31 39 2e 37 39 33 37 37 39 38 35 30 30 30 t;19.793 77985000
01c0 36 31 30 34 26 71 75 6f 74 3b 5d 2c 5b 26 71 75 6104&quo t;],[&qu
01d0 6f 74 3b 33 39 2e 38 30 31 36 37 38 35 35 31 32 ot;39.80 16785512
01e0 31 39 37 33 26 71 75 6f 74 3b 2c 26 71 75 6f 74 1973&quo t;,"
01f0 3b 31 39 2e 37 30 37 32 36 32 35 31 36 30 32 31 ;19.7072 62516021
0200 37 33 26 71 75 6f 74 3b 5d 2c 5b 26 71 75 6f 74 73" ],["
0210 3b 33 39 2e 38 30 39 30 36 33 35 31 32 33 36 34 ;39.8090 63512364
0220 38 36 35 26 71 75 6f 74 3b 2c 26 71 75 6f 74 3b 865" ;,"
0230 31 39 2e 36 36 38 38 31 30 33 36 37 35 38 34 32 19.66881 03675842
0240 33 26 71 75 6f 74 3b 5d 2c 5b 26 71 75 6f 74 3b 3"] ,["
0250 33 39 2e 37 35 31 35 34 35 33 36 33 39 33 37 35 39.75154 53639375
0260 39 26 71 75 6f 74 3b 2c 26 71 75 6f 74 3b 31 39 9", "19
0270 2e 36 31 37 39 39 38 36 30 30 30 30 36 31 30 34 .6179986 00006104
0280 26 71 75 6f 74 3b 5d 2c 5b 26 71 75 6f 74 3b 33 "], ["3
0290 39 2e 36 37 32 38 34 31 38 38 31 31 39 39 34 33 9.672841 88119943
02a0 26 71 75 6f 74 3b 2c 26 71 75 6f 74 3b 31 39 2e ",& quot;19.
02b0 36 36 34 36 39 30 34 39 34 35 33 37 33 35 34 26 66469049 4537354&
02c0 71 75 6f 74 3b 5d 2c 5b 26 71 75 6f 74 3b 33 39 quot;],[ "39
02d0 2e 36 34 30 35 39 35 30 39 30 38 38 35 37 36 26 .6405950 9088576&
02e0 71 75 6f 74 3b 2c 26 71 75 6f 74 3b 31 39 2e 37 quot;,&q uot;19.7
02f0 30 39 33 32 32 34 35 32 35 34 35 31 36 36 26 71 09322452 545166&q
0300 75 6f 74 3b 5d 2c 5b 26 71 75 6f 74 3b 33 39 2e uot;],[& quot;39.
0310 36 35 36 34 35 36 30 34 38 31 32 38 32 39 26 71 65645604 812829&q
0320 75 6f 74 3b 2c 26 71 75 6f 74 3b 31 39 2e 37 34 uot;,&qu ot;19.74
0330 37 37 37 34 36 30 30 39 38 32 36 36 36 26 71 75 77746009 82666&qu
0340 6f 74 3b 5d 5d 2c 26 71 75 6f 74 3b 6d 65 74 61 ot;]],&q uot;meta
0350 26 71 75 6f 74 3b 3a 20 7b 26 71 75 6f 74 3b 6c ": {"l
0360 61 74 26 71 75 6f 74 3b 20 3a 20 26 71 75 6f 74 at" : "
0370 3b 33 39 2e 36 30 33 33 30 32 39 32 35 39 30 38 ;39.6033 02925908
0380 32 38 26 71 75 6f 74 3b 2c 26 71 75 6f 74 3b 6c 28" ,"l
0390 6e 67 26 71 75 6f 74 3b 20 3a 20 26 71 75 6f 74 ng" : "
03a0 3b 31 39 2e 38 38 33 31 35 36 32 34 36 31 38 35 ;19.8831 56246185
03b0 33 31 26 71 75 6f 74 3b 2c 26 71 75 6f 74 3b 74 31" ,"t
03c0 79 70 65 26 71 75 6f 74 3b 20 3a 20 26 71 75 6f ype" ; : &quo
03d0 74 3b 72 6f 61 64 6d 61 70 26 71 75 6f 74 3b 2c t;roadma p",
03e0 26 71 75 6f 74 3b 7a 6f 6f 6d 26 71 75 6f 74 3b "zo om"
03f0 20 3a 20 26 71 75 6f 74 3b 31 31 26 71 75 6f 74 : " ;11"
0400 3b 7d 7d ;}}