Types of Errors in PHP

Errors in PHP

*We have four different types of errors in php.

1)  Notice Errors: Notice displays a massage to the end user and it will not stop the execution of the script.

Ex: If you are trying to access the undefined variable, the output is a notice massage. By default we cannot see the notices on the webpage. Because in “php.in” “error_reporting” is a configuration directive. The values of this directive is “E_ALL&~E_NOTICE”. It means browser displays all the errors expect notices.

*To display the notices, remove “&~E_NOTICE” from the configuration directives. Or use “error_reporting(E_ALL)” in the script , from where you want to display the notice massages.

2) Warning Errors: Warning errors are same as notice errors. Displays the same information to the users. Warning errors will not stop the execution of the script.

Ex: If you are trying to access the undefined constant then the output is warning error.

*In php we can declare the Constance using define keyword.

*define (<name>,<value>)

<?php
define ("city","hyd");
echo constant ("city")
echo constant ("stt")
echo "netline";
?>

*In above script “echo constant” is undefined constant.

Fatal Errors: Fatal errors stop the execution of the rest of the script. If you are trying to access the undefined functions, then the output is fatal error.

Ex:

<?php
function fun1()
{
echo "hi";
}
fun1();
fun2();
echo "next";
?>

Parse errors (syntax errors): If there is any syntax mistake in the script, the output is Parse errors. It stops the execution of entire script.

Ex: If you observe the below script, the second line does not contains “;” .

<?php
echo "line1";
echo "line2"
echo "line3";
?>