Php > Errors and Logging sample source codes

Error Handler

Error Handler

<?php 

// redefine the user error constants - PHP 4 only 
define ("FATAL",E_USER_ERROR); 
define ("ERROR",E_USER_WARNING); 
define ("WARNING",E_USER_NOTICE); 

// set the error reporting level for this script 
error_reporting (FATAL | ERROR | WARNING); 

// error handler function 
function myErrorHandler ($errno, $errstr, $errfile, $errline) { 
  switch ($errno) { 
  case FATAL: 
    echo "<b>FATAL</b> [$errno] $errstr<br>\n"; 
    echo "  Fatal error in line ".$errline." of file ".$errfile; 
    echo ", PHP ".PHP_VERSION." (".PHP_OS.")<br>\n"; 
    echo "Aborting...<br>\n"; 
    exit(1); 
    break; 
  case ERROR: 
    echo "<b>ERROR</b> [$errno] $errstr<br>\n"; 
    break; 
  case WARNING: 
    echo "<b>WARNING</b> [$errno] $errstr<br>\n"; 
    break; 
    default: 
    echo "Unkown error type: [$errno] $errstr<br>\n"; 
    break; 
  } 
} 

// function to test the error handling 
function scale_by_log ($vect, $scale) { 
  if ( !is_numeric($scale) || $scale <= 0 ) 
    trigger_error("log(x) for x <= 0 is undefined, you used: scale = $scale", 
      FATAL); 
  if (!is_array($vect)) { 
    trigger_error("Incorrect input vector, array of values expected", ERROR); 
    return null; 
  } 
  for ($i=0; $i<count($vect); $i  ) { 
    if (!is_numeric($vect[$i])) 
      trigger_error("Value at position $i is not a number, using 0 (zero)", 
        WARNING); 
    $temp[$i] = log($scale) * $vect[$i]; 
  } 
  return $temp; 
} 

// set to the user defined error handler 
$old_error_handler = set_error_handler("myErrorHandler"); 

// trigger some errors, first define a mixed array with a non-numeric item 
echo "vector a\n"; 
$a = array(2,3,"foo",5.5,43.3,21.11); 
print_r($a); 

// now generate second array, generating a warning 
echo "----\nvector b - a warning (b = log(PI) * a)\n"; 
$b = scale_by_log($a, M_PI); 
print_r($b); 

// this is trouble, we pass a string instead of an array 
echo "----\nvector c - an error\n"; 
$c = scale_by_log("not array",2.3); 
var_dump($c); 

// this is a critical error, log of zero or negative number is undefined 
echo "----\nvector d - fatal error\n"; 
$d = scale_by_log($a, -2.5); 

?>