w3resource

PHP error handling functions - restore_error_handler()

Description 

After changing the error handler using set_error_handler(), restore_error_handler() function is used to get the previous error handler back.

Version:

PHP 4.0.1,5

Syntax:

restore_error_handler(void)

Parameter:

None.

Return Values:

This function always returns TRUE.

Example:

<?php
function err_log($error_no, $error_string)
{
  $filename = '/log/php_errors.log';  
  if(filesize($file) > 2048) 
{
    rename($file, $file . (string) time( ));
    clearstatcache( );
  
}
   error_log($error_string, 3, $filename);
}
set_error_handler('err_log');>
  for($i = 0; $i < 2500; $i++)
 {
    trigger_error(time( ) . ": This is an error.\n");
 
}
restore_error_handler( );
?>

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Next: restore_exception_handler()



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