How do I Determine if a PHP Script is Running from the CLI or a Web Server?

Determining PHP Invocation Source: CLI vs Web Server

Determining whether a PHP script is executed from the command-line interface (CLI) or a web server, such as Apache with mod_php, is essential for managing your scripts accordingly.

To effectively assess the invocation source, utilize the php_sapi_name() function. It returns a lowercase string specifying the interface type. Additionally, consider using the PHP_SAPI constant for this purpose.

For instance, to discern if PHP operates within the CLI, employ the following function:

<code class="php">function isCommandLineInterface()
{
    return (php_sapi_name() === 'cli');
}</code>

This approach provides a reliable method to determine the origin of your PHP script, allowing you to adapt its execution appropriately.

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