TYPE OF ERRORS IN PHP

There are basically 4 types of errors in PHP. They are –

1. Notice – It is a simple message to end-user. It does not stop execution of script. If we are trying to access undefined variable, output is notice message.

Example –

<?php

echo $y;

echo "hi";

?>

Output –

Notice: Undefined variable: y in C:\Users\om\workspace\PhpProjec\first.php on line 2

hi

2. Warning – It is same as notice, doesn’t stop execution of script. If we are trying to access undefined constants, output is warning message. Constant is same as variable, but constant value cannot be changed. In PHP, using define function we declare constants. Using constant function we can access constants.

Example –

<?php

define("city","guwahati");

echo constant("city");

echo constant("state");

echo "hi";

?>

Output –

guwahati

Warning: constant(): Couldn't find constant state in C:\Users\om\workspace\PhpProjec\first.php on line 4

Hi

3. Fatal error – Fatal error stops the execution of script from the line where error is occurred. If we try to access undefined function, output is fatal error.

Example –

<?php

echo "Rakesh";

defin("city","guwahati");

echo "hi";

?>

Output –

Rakesh

Fatal error: Call to undefined function defin() in C:\Users\om\workspace\PhpProjec\first.php on line 3

4. Parse error – If there is any syntax mistake in the script, output is parse error. Parse error stops execution of complete script.

Example –

<?php

echo "Rakesh";

echo "Bikash"

echo "Apurba";

?>

Output –

Parse error: syntax error, unexpected 'echo' (T_ECHO), expecting ',' or ';' in C:\Users\om\workspace\PhpProjec\first.php on line 4

Example –

<?php

echo "Rakesh ";

echo "Bikash ";

echo "Apurba" // executes since last line does not require ;

?>

Output –

Rakesh Bikash Apurba