PHP – how to best determine if the current invocation is from CLI or web server?

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php_sapi_name is the function you will want to use as it returns a lowercase string of the interface type. In addition, there is the PHP constant PHP_SAPI.

Documentation can be found here: http://php.net/php_sapi_name

For example, to determine if PHP is being run from the CLI, you could use this function:

function isCommandLineInterface()
{
    return (php_sapi_name() === 'cli');
}

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