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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( );
?>

Previous: error_reporting()
Next: restore_exception_handler()



PHP: Tips of the Day

How to Sort Multi-dimensional Array by Value?

Try a usort, If you are still on PHP 5.2 or earlier, you'll have to define a sorting function first:

Example:

function sortByOrder($a, $b) {
    return $a['order'] - $b['order'];
}

usort($myArray, 'sortByOrder');

Starting in PHP 5.3, you can use an anonymous function:

usort($myArray, function($a, $b) {
    return $a['order'] - $b['order'];
});

And finally with PHP 7 you can use the spaceship operator:

usort($myArray, function($a, $b) {
    return $a['order'] <=> $b['order'];
});

To extend this to multi-dimensional sorting, reference the second/third sorting elements if the first is zero - best explained below. You can also use this for sorting on sub-elements.

usort($myArray, function($a, $b) {
    $retval = $a['order'] <=> $b['order'];
    if ($retval == 0) {
        $retval = $a['suborder'] <=> $b['suborder'];
        if ($retval == 0) {
            $retval = $a['details']['subsuborder'] <=> $b['details']['subsuborder'];
        }
    }
    return $retval;
});

If you need to retain key associations, use uasort() - see comparison of array sorting functions in the manual

Ref : https://bit.ly/3i77vCC