PHP error handling functions - debug_print_backtrace()
Introduction
The debug_print_backtrace() function prints a backtrace which may contain function calls, included/required files and eval()ed.
Version:
PHP 4,5
Syntax:
debug_print_backtrace (void)
Parameters:
debug_print_backtrace function does not have any parameters.
Return Values:
debug_print_backtrace function does not have any return value.
Example:
<?php
function w3r_html() {
w3r_php();
}
function w3r_php() {
w3r_mysql();
}
function w3r_mysql(){
debug_print_backtrace();
}
w3r_html();
?>
The above code displays this output :
#0 w3r_mysql() called at [C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\php\debug-print-backtrace-example.php:7] #1 w3r_php() called at [C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\php\debug-print-backtrace-example.php:3] #2 w3r_html() called at [C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\php\debug-print-backtrace-example.php:13]>
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Next: error_get_last()
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
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