php error handling - Wikitechy

Explain about error handling in php ?

Editor — Wed, 21 Jul 2021 13:14:32 +0000

Explain about error handling in php ?

Error handling is the process of catching errors elevated from program and then taking correct action. If you would handle errors then the most common error checking methods given in PHP.
- die() function
- Custom errors and error triggers
- Error reporting

die() function

To write the PHP program you should check all possible error condition before checking and take appropriate action when required.
The following example without having /tmp/test.xt file and with this file.

   if(!file_exists("/tmp/test.txt")) {
      die("File not found");
   }else {
      $file = fopen("/tmp/test.txt","r");
      print "Opend file sucessfully";
   }
   // Test of the code here.
?>

Custom errors and error triggers

We can write own function to handling any error. PHP provides a framework to define error handling function.
This function must be able to handle a minimum of two parameters (error level and error message) but can accept up to five parameters (optionally: file, line-number, and the error context)

Syntax

error_function(error_level,error_message, error_file,error_line,error_context);

Error reporting

These error report levels are the different types of error the user-defined error handler can be used.
The errors are .E_ERROR, E_WARNING, E_PARSE, E_NOTICE, E_CORE_ERROR, E_CORE_WARNING, E_USER_ERROR, E_USER_WARNING, E_USER_NOTICE, E_STRICT, E_RECOVERABLE_ERROR, E_ALL
These all errors handle to using set_error_handler function.

 
   error_reporting( E_ERROR );
   
   function handleError($errno, $errstr,$error_file,$error_line) {
      echo "Error: [$errno] $errstr - $error_file:$error_line";
      echo "
";
      echo "Terminating PHP Script";
      
      die();
   }
   
   //set error handler
   set_error_handler("handleError");
   
   //trigger error
   myFunction();
?>