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Error Handler

set_error_handler($f($i1,$s1[,$s2[,$i2[,$arr]]]) [,$i3=E_ALL|E_STRICT]) sets a user function $f() to handle errors. $i1 contains the level of the error raised. $s1 contains the error message. $s2 contains the filename. $i2 contains the line number. $arr contains all variables in the scope. If $f() returns FALSE then the normal error handler continues. $i3 dictates what error levels trigger the error handler $f(). restore_error_handler() reverts to the previous error handler function, which can be a built-in or a user-defined function. 

<!DOCTYPE html><html><head></head>
<body><?php
function eh($errno,$errmsg,$file,$line,$var){
   echo "Error level $errno<br />";
   echo "$errmsg<br />";
   echo "$file<br />";
   echo "Line $line<br />";
   print_r($var);
}
function eh2(){
   echo "Error";
}
set_error_handler('eh');
set_error_handler('eh2');
restore_error_handler();
echo $a;

?> </body></html>

Error level 8
Undefined variable: a
E:\Program Files\xampp\htdocs\intro.php
Line 16
Array ( [_GET] => Array ( ) [_POST] => Array ( ) [_COOKIE] => Array ( ) [_FILES] => Array ( ) )
Similarly, restore_exception_handler() reverts to the previous exception handler, after changing the exception handler using set_exception_handler().