WEB BASED PROGRAMMING - PHP Error and Exception Handling Returning errors from functions SYNTAX Example

1. TRINITY INSTITUTE OF PROFESSIONAL
STUDIESSector – 9, DwarkaInstitutional Area, New Delhi-75
Affiliated G.G.S.IP.U, Delhi
By: ShwetaBhardwaj
WEB BASED
PROGRAMMING
PAPER ID: 20313

2. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, DwarkaInstitutional Area, New Delhi-75
PHP Error
and
Exception Handling

3. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, DwarkaInstitutional Area, New Delhi-75
• Error handling is the process of catching errors
raised by your program and then taking
appropriate action. If you would handle errors
properly then it may lead to many unforeseen
consequences.
• Its very simple in PHP to handle an errors.

4. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, DwarkaInstitutional Area, New Delhi-75
Returning errors from functions
• Php in built functions return false when error
occurs.
• When a function returns false we can print
error message using DIE() function.
The die() function prints a message and exits the
current script.

5. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, DwarkaInstitutional Area, New Delhi-75
SYNTAX
• die(message)
Message 
Required. Specifies the message or status
number to write before exiting the script. The
status number will not be written to the
output.

6. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, DwarkaInstitutional Area, New Delhi-75
Example
• <?php
$site = "http://www.w3schools.com/";
fopen($site,"r")
or die("Unable to connect to $site");
?>

7. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, DwarkaInstitutional Area, New Delhi-75
<?php if(!file_exists("/tmp/test.txt"))
{
die("File not found");
}
else
{
$file=fopen("/tmp/test.txt","r");
print "Opend file sucessfully";
}
// Test of the code here.
?>

8. TRINITY INSTITUTE OF PROFESSIONAL STUDIES
Sector – 9, DwarkaInstitutional Area, New Delhi-75