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==Catching Exceptions in PHP 5==



<source lang="html4strict">

<?php
class MyException extends Exception {
}
class AnotherException extends Exception {
}
class ThrowExample {
public function makeMyException() {
throw new MyException();
}
public function makeAnotherException() {
throw new AnotherException();
}
public function makeError() {
throw new Exception();
}
}
$inst = new ThrowExample();
try {
$inst->makeMyException();
} catch(MyException $e) {
echo "Caught "MyException"\n";
}
try {
$inst->makeAnotherException();
} catch(MyException $e) {
echo "Caught "MyException"\n";
} catch(AnotherException $e) {
echo "Caught "AnotherException"\n";
}
try {
$inst->makeError();
} catch(MyException $e) {
echo "Caught "MyException"\n";
} catch(AnotherException $e) {
echo "Caught "AnotherException"\n";
}
?>

</source>

==extends Exception to create your own exception==



<source lang="html4strict">

<?php
class MyException extends Exception {
function __construct($language,$errorcode) {
$this->language = $language;
$this->errorcode = $errorcode;
}
function getMessageMap() {
$errors = file("errors/".$this->language.".txt");
foreach($errors as $error) {
list($key,$value) = explode(",",$error,2);
$errorArray[$key] = $value;
}
return $errorArray[$this->errorcode];
}
}
try {
throw new MyException("english",4);
}
catch (MyException $e) {
echo $e->getMessageMap();
}
?>

</source>

==Using Custom Exceptions to Handle Different Circumstances==



<source lang="html4strict">

<?php
class MyException extends Exception {
public function summarize() {
$ret = "<pre>\n";
$ret .= "msg: ".$this->getMessage()."\n"
."code: ".$this->getCode()."\n"
."line: ".$this->getLine()."\n"
."file: ".$this->getFile()."\n";
$ret .= "</pre>\n";
return $ret;
}
}
class FileNotFoundException extends MyException { }
class FileOpenException extends MyException { }
class Reader {
function getContents( $file ) {
throw new FileNotFoundException( "could not find "$file"" );
throw new FileOpenException( "unable to open "$file"" );
}
}
$reader = new Reader();
try {
print $reader->getContents( "blah.txt" );
} catch ( FileNotFoundException $e ) {
print $e->summarize();
} catch ( FileOpenException $e ) {
print $e->summarize();
} catch ( Exception $e ) {
die("unknown error");
}
?>

</source>

==Using PHP 5 exception handling==



<source lang="html4strict">

<?php
function errors_to_exceptions($code, $message) {
throw new Exception($code, $message);
}
set_error_handler("errors_to_exceptions");
try {
$connection = mysql_connect($host, $user, $password);
mysql_select_db($database, $connection);
$query = "SELECT page_id,link_text,parent_id FROM menus WHERE page_id="$pid"";
$result = mysql_query($query);
if(mysql_num_rows($result) == 0)
echo "Invalid page request -- click <a href=\"" . $_SERVER["PHP_SELF"] . "?pid=1\">here</a> to continue.</h2>\n";
else {
$value = mysql_fetch_object($result);
}
}catch (Exception $e) {
printf("<p>Caught exception: %s.</p>\n", $e->getMessage());
}
?>

</source>

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в 10:37, 26 мая 2010

Admin: 1 версия