How to Determine Whether Your PHP Script is Running on the CLI or a Web Server?

Determining PHP Invocation Type: CLI vs. Web Server

When running PHP scripts, it can be useful to know whether the invocation is from the command line interface (CLI) or a web server. This information can be leveraged to tailor the script's behavior accordingly.

php_sapi_name Function

The recommended method to determine the invocation type is to use the php_sapi_name function. This function returns a lowercase string representing the interface type. Additionally, PHP provides a constant, PHP_SAPI, which can be used in place of the function.

Function Usage:

To determine if PHP is being run from the CLI, you can use the following code snippet:

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

This function returns true if the script is being run from the CLI and false if it is being executed by a web server.

Sample Implementation:

The following code example illustrates how to utilize the php_sapi_name function:

<code class="php">if (isCommandLineInterface()) {
    // Execute CLI-specific code
} else {
    // Execute web server-specific code
}</code>

Additional Resources:

For more information on PHP_SAPI, refer to the following documentation:

• http://php.net/php_sapi_name

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