How Do I Determine If a PHP Script Is Running From the Command Line or Through HTTP?

Determining Command-Line vs. HTTP Execution in PHP

In developing PHP scripts, it often becomes necessary to distinguish between execution via the command-line or through HTTP. Output formatting and other aspects of script behavior may differ based on this differentiation.

Canonical Method: php_sapi_name()

The recommended approach to determine the execution mode is to utilize the php_sapi_name() function. It returns the type of interface between the web server and PHP.

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

Additional Notes:

• php_sapi_name() provides a comprehensive list of possible return values, including various web server types and command-line interfaces.
• In PHP >= 4.2.0, PHP_SAPI is a predefined constant that has the same value as php_sapi_name().

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