Test or List PHP Error Reporting Flags

List Enabled Error Reporting Flags.php

<?php

//  example call, specifying bit-flags,
//  returns as string:
echo listEnabledErrorReportingFlags(E_ALL & ~(E_WARNING|E_NOTICE|E_STRICT));

//  example call, using current bit-flags,
//  returns as array:
var_export(listEnabledErrorReportingFlags(null, TRUE));

/** 
 * List the error_reporting levels enabled.
 * Calls error_reporting() if bitflags are not provided.
 * 
 * @param  int  $error_reporting bitflags used for php error_reporting
 * @param  boolean $asArray         result as array, indexed by bitflag integers
 * @return String                   string or array
 */
function listEnabledErrorReportingFlags($error_reporting=NULL,$asArray=FALSE) {
  if (!isset($error_reporting)) {
    $error_reporting = error_reporting();
  }

  $list = ($asArray)? array() : '' ;
  foreach (getErrorReportingLevelMap() as $level => $label) {
    $index = ($asArray) ? $level : FALSE;
    if ($error_reporting == E_ALL) {
      addToList($list, $errorLevels[E_ALL], $index);
      break;
    }
    if ($level == E_ALL) {
      continue;
    }
    if ($error_reporting & $level) {
      addToList($list, $label, $index);
    }
  }

  return $list;
}

/**
 * If index is provied, assumes $list is an array.
 * Else assumes list is a string.
 * @param [type]  $list  String or Array to append to.
 * @param String  $label value added
 * @param boolean $index Optional
 */
function addToList(&$list, $label, $index=FALSE) {
  if ($index) {
    $list[$index] = $label;
  } else {
    $list .= $label."\n";
  }
}

function getErrorReportingLevelMap() {
  return array(
  E_ERROR =>'E_ERROR: Fatal run-time errors',
  E_WARNING =>'E_WARNING: Run-time warnings (non-fatal errors).',
  E_PARSE =>'E_PARSE: Compile-time parse errors.',
  E_NOTICE =>'E_NOTICE: Run-time notices.',
  E_CORE_ERROR =>'E_CORE_ERROR: This is like an E_ERROR, except it is generated by the core of PHP.',
  E_CORE_WARNING =>'E_CORE_WARNING: This is like an E_WARNING, except it is generated by the core of PHP.',
  E_COMPILE_ERROR =>'E_COMPILE_ERROR: Fatal compile-time errors.',
  E_COMPILE_WARNING =>'E_COMPILE_WARNING: Compile-time warnings (non-fatal errors).',
  E_USER_ERROR =>'E_USER_ERROR: User-generated error message.',
  E_USER_WARNING =>'E_USER_WARNING: User-generated warning message.',
  E_USER_NOTICE =>'E_USER_NOTICE: User-generated notice message.',
  E_STRICT => 'E_STRICT:',
  E_RECOVERABLE_ERROR =>'E_RECOVERABLE_ERROR: Catchable fatal error.',
  E_DEPRECATED =>'E_DEPRECATED: Run-time notices.',
  E_USER_DEPRECATED =>'E_USER_DEPRECATED: User-generated warning message.',
  E_ALL =>'E_ALL:',
  );
}
// https://secure.php.net/manual/en/errorfunc.constants.php
// Errors and Logging Value 	Constant 	Description 	Note
// 1 	E_ERROR (integer) 	Fatal run-time errors. These indicate errors that can not be recovered from, such as a memory allocation problem. Execution of the script is halted.
// 2 	E_WARNING (integer) 	Run-time warnings (non-fatal errors). Execution of the script is not halted.
// 4 	E_PARSE (integer) 	Compile-time parse errors. Parse errors should only be generated by the parser.
// 8 	E_NOTICE (integer) 	Run-time notices. Indicate that the script encountered something that could indicate an error, but could also happen in the normal course of running a script.
// 16 	E_CORE_ERROR (integer) 	Fatal errors that occur during PHP's initial startup. This is like an E_ERROR, except it is generated by the core of PHP.
// 32 	E_CORE_WARNING (integer) 	Warnings (non-fatal errors) that occur during PHP's initial startup. This is like an E_WARNING, except it is generated by the core of PHP.
// 64 	E_COMPILE_ERROR (integer) 	Fatal compile-time errors. This is like an E_ERROR, except it is generated by the Zend Scripting Engine.
// 128 	E_COMPILE_WARNING (integer) 	Compile-time warnings (non-fatal errors). This is like an E_WARNING, except it is generated by the Zend Scripting Engine.
// 256 	E_USER_ERROR (integer) 	User-generated error message. This is like an E_ERROR, except it is generated in PHP code by using the PHP function trigger_error().
// 512 	E_USER_WARNING (integer) 	User-generated warning message. This is like an E_WARNING, except it is generated in PHP code by using the PHP function trigger_error().
// 1024 	E_USER_NOTICE (integer) 	User-generated notice message. This is like an E_NOTICE, except it is generated in PHP code by using the PHP function trigger_error().
// 2048 	E_STRICT (integer) 	Enable to have PHP suggest changes to your code which will ensure the best interoperability and forward compatibility of your code. 	Since PHP 5 but not included in E_ALL until PHP 5.4.0
// 4096 	E_RECOVERABLE_ERROR (integer) 	Catchable fatal error. It indicates that a probably dangerous error occurred, but did not leave the Engine in an unstable state. If the error is not caught by a user defined handle (see also set_error_handler()), the application aborts as it was an E_ERROR. 	Since PHP 5.2.0
// 8192 	E_DEPRECATED (integer) 	Run-time notices. Enable this to receive warnings about code that will not work in future versions. 	Since PHP 5.3.0
// 16384 	E_USER_DEPRECATED (integer) 	User-generated warning message. This is like an E_DEPRECATED, except it is generated in PHP code by using the PHP function trigger_error(). 	Since PHP 5.3.0
// 32767 	E_ALL (integer)