How do I Determine if a PHP Script is Executed via Command Line or HTTP Request?

Distinguishing Command-Line Execution from HTTP Execution in PHP

Determining whether a PHP script is executed via the command line or HTTP request is essential for customizing output formats. While inspecting the SERVER['argc'] variable may seem like a valid approach, it's not always accurate, even with Apache's 'Apache 2.0 Handler' server API.

The canonical method to accomplish this task is the php_sapi_name() function.

if (php_sapi_name() == "cli") {
    // In cli-mode
} else {
    // Not in cli-mode
}

As specified in the PHP documentation:

php_sapi_name returns the type of interface between the web server and PHP.

Possible return values include "apache2handler," "cgi," "cli," "isapi," "litespeed," etc.

Alternatively, you can use the PHP_SAPI constant, which has the same value as php_sapi_name(), introduced in PHP version 4.2.0.

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