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PHP Error

Types of errors in PHP

A common misconception,espcially less experienced developers, is that a "good" proram is one that works without php errors.

In fact, this is not strictly true: a better definition might be that a good program is one that anticipates all possible php error conditions ahead of time and deals with a consisten and correct manner.

PHP Error Categories

Error Type Description Example
Notices Non-Critical errors that don't stop PHP from executing a script Accessing a variable that has not been initialized.
Warnings More Serious errors that require attention but still don't stop script execution. Reading a file that doesn't exist in the stated path. or passed wrong parameters inside a function
Fatal Errors Syntax errors, or Critical errors that force PHP to stop executing a script. Instantiating an object of an undefined class.

PHP Error Levels

Error Level Description
E_PARSE Fatal parse errors
E_NOTICE Non-fatal run-time erros(notices)
E_WARNING Non-fatal run-time errors(warnings)
E_ERROR Fatal run-time errors that force script termination
E_USER_NOTICE User-defined non-fatal application errors(notices)
E_USER_WARNING User-defined non-fatal application errors(warnings)
E_USER_ERROR User-defined fatal application errors
E_STRICT Non-fatal run-time errors arising from deprecated PHP syntax
E_ALL All errors

error is unwanted error unexpected behavior of a program. an error can be of two types :

Syntax error :if there is any missing symbol or extra symbol the it is said to be error in syntax.

Logical error :if there is an error in logic of a program like divide by zero or object is called but not declared then it is called logical error.

There are 3 types of error

1) notices error

2) warning 3

) fatal error

Notice : In notices error if any variable is not declared but it is used at some point then it will show an notice error. Notice error can hides using "@" before $ Sign.

<?php

for($i=1;$i<=100;$i++)

{

$sum=$sum+$i;

}

echo "Sum = ".$sum;

?>
Output Sum = 5050 Notice : if you are using XAMPP server your output will apper Sum = 5050 because notice error disabled appear in XAMPP server and if you are using WAMP server it shows your output lik Sum = 5050 and also a notice error for $sum variable

Warning error

Warning : if there is still a mistake in program but output is obtained , this type of error is called warning error.

It is not a critical error because it doesn't terminate the program.

warning error arises due to two conditions:

a) if we are passing wrong type of parameters in parametrized function.

b) if we are calling a external PHP file using include function and file doesn't exist then warning error showed.

<?php

include('header.php');

for($i=1;$i<=100;$i++)

{

$sum=$sum+$i;

}

echo "Sum = ".$sum;

?>

Output Warning: include(header.php) [function.include]: failed to open stream: No such file or directory in C:xampplitehtdocs18-06loopsum.php on line 2 Warning: include() [function.include]: Failed opening 'header.php' for inclusion (include_path='.;C:xampplitephpPEAR') in C:xampplitehtdocs18-06loopsum.php on line 2 Sum = 5050

Fatal error

Fatal error : fatal error is a critical error and it terminates the script immediately.

fatal error comes if we calling external file using require() function and file doesn't exist then showed warning and fatal.

<?php

require('header.php');

for($i=1;$i<=100;$i++)

{

$sum=$sum+$i;

}

echo "Sum = ".$sum;

?>

Output Warning: require(header.php) [function.require]: failed to open stream: No such file or directory in C:xampplitehtdocs18-06loopsum.php on line 2 Fatal error: require() [function.require]: Failed opening required 'header.php' (include_path='.;C:xampplitephpPEAR') in C:xampplitehtdocs18-06loopsum.php on line 2

Notice : we can handle/hide all the above types of error using error_reporting(1) function.


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