w3resource

PHP error handling functions -restore_ exception_handler()

Description 

PHP restore_exception_handler function is used to restore previously defined exception handler.

Version:

PHP 5.

Syntax:

restore_exception_handler( void )

Where type of restore_exception_handler is boolean.

Parameter:

This function does not have any parameter.

Return Values:

This function always returns TRUE.

Example:

<?php
 function exception_handler_1(Exception $e)
 {
 echo '[' . __FUNCTION__ . '] ' . $e->getMessage();
 }
 function exception_handler_2(Exception $e)
 {
 echo '[' . __FUNCTION__ . '] ' . $e->getMessage();
 }
set_exception_handler('exception_handler_1');
set_exception_handler('exception_handler_2');
restore_exception_handler();
throw new Exception('This triggers the first exception handler...');
?> 

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PHP: Tips of the Day

PHP: How to convert string to boolean?

Strings always evaluate to boolean true unless they have a value that's considered "empty" by PHP (taken from the documentation for empty):

  1. "" (an empty string);
  2. "0" (0 as a string)

If you need to set a boolean based on the text value of a string, then you'll need to check for the presence or otherwise of that value.

$test_mode_mail = $string === 'true'? true: false;

EDIT: the above code is intended for clarity of understanding. In actual use the following code may be more appropriate:

$test_mode_mail = ($string === 'true');

or maybe use of the filter_var function may cover more boolean values:

filter_var($string, FILTER_VALIDATE_BOOLEAN);

filter_var covers a whole range of values, including the truthy values "true", "1", "yes" and "on".

Ref : https://bit.ly/33SQ3eP