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Sure, here are some steps you can follow to resolve the PHP error on MacOS:

1. Check if PHP is installed on your MacOS by opening the terminal and typing "php -v" without quotes. If PHP is installed, you should see the version number displayed. If not, you can install it using a package manager like Homebrew or by downloading the latest version from the official PHP website.

2. Make sure that the path to the PHP executable is added to your system's PATH environment variable. You can check this by running "echo $PATH" in the terminal. If the path to the PHP executable is not included in the PATH variable, you can add it by editing the ".bashprofile" file in your home directory and appending the path to the PHP executable at the end of the file. For example, if the path to your PHP executable is "/usr/local/bin/php", you can add the following line to your ".bashprofile" file: export PATH=$PATH:/usr/local/bin

3. Restart your terminal or run "source ~/.bash_profile" to reload the PATH variable and apply the changes.

4. Check that your web server (e.g. Apache) is configured to use the correct PHP executable. You can do this by opening the web server configuration file (e.g. "/etc/apache2/httpd.conf" for Apache on MacOS) and checking the "LoadModule" and "AddHandler" directives for PHP. Make sure that the paths to the PHP executable and PHP module match the ones you installed and added to your PATH variable.

5. Restart your web server to apply the changes to the configuration file.

Once you have done these steps, you should be able to run PHP scripts and resolve the error message saying that the PHP executable could not be found.