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In PHP, is there any way that I can ignore functions that are undefined instead of throwing a fatal error that is visible in the browser?—i.e., Fatal error: Call to undefined function
I know that there is the practice of wrapping all custom functions in a conditional as below, but is there a programmatic way to get this effect?
if (function_exists('my_function')) {
// use my_function() here;
}
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Fatal Error: 'Call to undefined function mysql_connect()' If you get an error like Fatal error: Call to undefined function mysql_connect() when trying to install GFI HelpDesk, it probably means that MySQL support has not been enabled for PHP on your server (that is, the PHP module php-mysql has not been installed).
It's an error that caused the script to abort and exit immediately. All statements after the fatal error are never executed. I strongly recommend you use an editor that will alert you to errors as you code. It will safe you a lot of time.
Fatal errors or recoverable fatal errors now throw instances of Error in PHP 7 or higher versions. Like any other exceptions, Error objects can be caught using a try/catch block.
No. Fatal errors are fatal. Even if you were to write your own error handler or use the @ error suppression operator, E_FATAL errors will still cause the script to halt execution.
The only way to handle this is to use function_exists() (and possibly is_callable() for good measure) as in your example above.
It's always a better idea to code defensively around a potential (probable?) error than it is to just let the error happen and deal with it later anyway.
EDIT - php7 has changed this behavior, and undefined functions/methods are catchable exceptions.
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