It sends an error to the server error-log

<?php
$value=2;
if ($value>1){
error_log(“An error occured”,1,”info@phpcodez.com”,”From: from@phpcodez.com”);
}
?>

Error  message will be sent to the given  email address

It returns the last error occurred

Example

<?php
echo “<pre>”;
echo $test;
print_r(error_get_last());
?>

Output

Array
(
[type] => 8
[message] => Undefined variable: test
[file] => /var/www/test/index.php
[line] => 3
)

It prints a backtrace

Example

<?php
echo “<pre>”;
function back($arg1, $arg2) {
debug_print_backtrace();
}
back(“test1”, “test2”);
?>

Output

#0  back(Peter, Griffin) called at [/var/www/test/index.php:6]

It generate a generates a backtrace and displays data from the code that led up to the debug_backtrace() function.

<?php
echo “<pre>”;
function back($arg1, $arg2) {
print_r(debug_backtrace());
}
back(“test1”, “test2”);
?>

The possible elements that can be returned are given below

function,line,file,class,object,type,Returns: “->” ,Returns: “::” ,Returns nothing,args

Output

Array
(
[0] => Array
(
[file] => /var/www/test/index.php
[line] => 6
[function] => back
[args] => Array
(
[0] => Peter
[1] => Griffin
)

)

)