w3resource

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

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