The php script cannot obtain the specified environment variable. how can this problem be solved?

The php script cannot obtain the specified environment variable and writes a php script: PHPcodefunctionupdateReq () {exec (& quot; python/home/gun/app/clim. py & quot;, $ outPut); return $ outP php script cannot obtain the specified environment variable
I wrote a php script:

PHP code

  Function updateReq () {exec ("python/home/gun/app/clim. py", $ outPut); return $ outPut ;}

The result is that clim. py cannot obtain the specified environment variable.
After the environment variables are set, it is okay to run clim. py directly in the root account. Is it a permission issue?

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PHP code

$ Out = array (); exec = ('Ls', $ out); print_r ($ out); // No
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This is related to your environment variables ..