Php get environment variable

$value = getenv("VARNAME");
// returns FALSE if VARNAME does not exist

$env_vars = getenv();
// if no name is specified, an associative array 
// with all environment variables is returned

Php set environment variable

putenv('NAME=VALUE');

// NAME may contain whitespaces ->
putenv('NAME=VALUE') 
// is not equivalent to 
putenv('NAME = VALUE')

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