![]() ![]() When the child exits, the connection is closed. The reason for the MySQL "Lost Connection during query" issue when forking is the fact that the child process inherits the parent's database connection. PHP Fatal error: Call to undefined function generate_fatal_error() in ~/fork_n_wait.php on line 16 PHP Fatal error: Call to undefined function generate_fatal_error() in ~fork_n_wait.php on line 16įORK: Parent, letting the child run amok. Here is fork_n_wait.php for your amusement: This allows me to keep the child process within the context of the parent's running environment and not suffer the consequences of Fatal Errors stopping the task queue from continuing to process. Naturally something similar could be done if I wanted to simply exec() the module and check the output, but then I would not have the benefit of the stateful environment that the parent script has so carefully prepared. I decided to try to use pcntl_fork() to isolate the task module from the parent code, and it seems to work: a Fatal Error generated within the module makes the child task bomb, and the waiting parent can simply catch the return code from the child and track/alert us to the problem as needed. Sometimes however a poorly behaved module will nuke with a Fatal Error and take out the parent script with it. One of our background automation systems creates a "task queue" of sorts and for each task in the queue, a PHP module is include()ed to handle the task. ![]() My team builds almost everything in PHP in order to leverage our core library of code, so it was of the essence to find a solution for this problem of scripts bombing unrecoverably and us never knowing about it. "Fatal Error" has always been the bane of my world because there is no way to capture and handle the condition in PHP. Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto search
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