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PHP

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Error

An error is a type of mistake. We can say an error is a condition of having incorrect or false knowledge or an error is defined as an unexpected, invalid program state from which it is impossible to recover.
Error can also be defined as "a deviation from accuracy or correctness". A "mistake" is an error caused by a fault: the fault being misjudgment, carelessness, or forgetfulness. An error message with filename, line number and a message describing the error is sent to the browser.

Types of error

  • Parse Error (Syntax Error)
  • Fatal Error
  • Warning Error
  • Notice Error

Parse Errors (syntax errors)

The parse error occurs if there is a syntax mistake in the script; the output is Parse errors. A parse error stops the execution of the script. There are many reasons for the occurrence of parse errors in PHP. The common reasons for parse errors are as follows:
Common reason of syntax errors are:

  • Unclosed quotes
  • Missing or Extra parentheses
  • Unclosed braces
  • Missing semicolon

<?php
echo "Cat";
echo "Dog"
echo "Lion";
?>

The Output from this program is:

Fatal Errors

Fatal errors are caused when PHP understands what you've written, however what you're asking it to do can't be done. Fatal errors stop the execution of the script. If you are trying to access the undefined functions, then the output is a fatal error.

<?php
function fun1()
{
echo "Vineet Saini";
}
fun2();
echo "Fatal Error !!";
?>

The Output from this program is:

Warning Errors

Warning errors will not stop execution of the script. The main reason for warning errors are to include a missing file or using the incorrect number of parameters in a function.

<?php
echo "Warning Error!!";
include ("Welcome.php");
?>

The Output from this program is:
In the above code we include a welcome.php file, however the welcome.php file does not exist in the directory. So there will be a warning error produced but that does not stop the execution of the script i.e. you will see a message Warning Error !!. Like in the following image:

Notice Errors

Notice that an error is the same as a warning error i.e. in the notice error execution of the script does not stop. Notice that the error occurs when you try to access the undefined variable, then produce a notice error.

<?php
$a="Vineet kumar saini";
echo "Notice Error !!";
echo $b;
?>

In the above code we defined a variable which named $a. But we call another variable i.e. $b, which is not defined. So there will be a notice error produced but execution of the script does not stop, you will see a message Notice Error !!. Like in the following image:



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