Terminating Programs

Sometimes a situation will arise when a loop execution has to be terminated. Quite often, this is necessary when an error occurs and further execution may have serious consequences. For example, the required file is not available or a user provided wrong parameters. In either case, further script execution may display confidential information or perform some other undesirable actions. Do not experiment in such case and stop the script execution.

Script execution can be interrupted with the exit() function. Script execution is terminated at once when this command is executed. The die() command is an alias for exit(), and both command allow a message to be displayed in the browser to be specified as a parameter. Consider the following classical example of connecting to a database: