我也沒有顯示，我顯示的是如下的：array (size=35)
?'ALLUSERSPROFILE' => string 'C:\ProgramData' (length=14)
?'APPDATA' => string 'C:\Windows\system32\config\systemprofile\AppData\Roaming' (length=56)
?'CommonProgramFiles' => string 'C:\Program Files\Common Files' (length=29)
?'CommonProgramFiles(x86)' => string 'C:\Program Files (x86)\Common Files' (length=35)
?'CommonProgramW6432' => string 'C:\Program Files\Common Files' (length=29)
?'COMPUTERNAME' => string 'QH-20170306XFDG' (length=15)
?'ComSpec' => string 'C:\Windows\system32\cmd.exe' (length=27)
?'FP_NO_HOST_CHECK' => string 'NO' (length=2)
?'LOCALAPPDATA' => string 'C:\Windows\system32\config\systemprofile\AppData\Local' (length=54)
?'NUMBER_OF_PROCESSORS' => string '4' (length=1)
?'OS' => string 'Windows_NT' (length=10)
?'Path' => string 'C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;F:\wamp\bin\php\php5.5.12;C:\ProgramData\ComposerSetup\bin;' (length=159)
?'PATHEXT' => string '.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC' (length=53)
?'PROCESSOR_ARCHITECTURE' => string 'AMD64' (length=5)
?'PROCESSOR_IDENTIFIER' => string 'Intel64 Family 6 Model 37 Stepping 5, GenuineIntel' (length=50)
?'PROCESSOR_LEVEL' => string '6' (length=1)
?'PROCESSOR_REVISION' => string '2505' (length=4)
?'ProgramData' => string 'C:\ProgramData' (length=14)
?'ProgramFiles' => string 'C:\Program Files' (length=16)
?'ProgramFiles(x86)' => string 'C:\Program Files (x86)' (length=22)
?'ProgramW6432' => string 'C:\Program Files' (length=16)
?'PSModulePath' => string 'C:\Windows\system32\WindowsPowerShell\v1.0\Modules\' (length=51)
?'PUBLIC' => string 'C:\Users\Public' (length=15)
?'SystemDrive' => string 'C:' (length=2)
?'SystemRoot' => string 'C:\Windows' (length=10)
?'TEMP' => string 'C:\Windows\TEMP' (length=15)
?'TMP' => string 'C:\Windows\TEMP' (length=15)
?'USERDOMAIN' => string 'WORKGROUP' (length=9)
?'USERNAME' => string 'QH-20170306XFDG$' (length=16)
?'USERPROFILE' => string 'C:\Windows\system32\config\systemprofile' (length=40)
?'windir' => string 'C:\Windows' (length=10)
?'windows_tracing_flags' => string '3' (length=1)
?'windows_tracing_logfile' => string 'C:\BVTBin\Tests\installpackage\csilogfile.log' (length=45)
?'_DFX_INSTALL_UNSIGNED_DRIVER' => string '1' (length=1)
?'AP_PARENT_PID' => string '6132' (length=4)

直接新建一個文件，命名.env就可以不是嗎？反正我是這么做的，IDE用的phpstorm