10 code snippets for PHP developers

10 code snippets for PHP developers

I've compiled a small list of some useful code snippets which might help you when writing your PHP scripts...

Email address check
Checks for a valid email address using the php-email-address-validation class.
Source and docs: http://code.google.com/p/php-email-address-validation/


include('EmailAddressValidator.php');

$validator = new EmailAddressValidator;
if ($validator->check_email_address('test@example.org')) {
// Email address is technically valid
}
else {
// Email not valid
}


Random password generator
PHP password generator is a complete, working random password generation function for PHP. It allows the developer to customize the password: set its length and strength. Just include this function anywhere in your code and then use it.
Source : http://www.webtoolkit.info/php-random-password-generator.html




function generatePassword($length=9, $strength=0) {
$vowels = 'aeuy';
$consonants = 'bdghjmnpqrstvz';
if ($strength & 1) {
$consonants .= 'BDGHJLMNPQRSTVWXZ';
}
if ($strength & 2) {
$vowels .= "AEUY";
}
if ($strength & 4) {
$consonants .= '23456789';
}
if ($strength & 8) {
$consonants .= '@#$%';
}

$password = '';
$alt = time() % 2;
for ($i = 0; $i < $length; $i++) { if ($alt == 1) { $password .= $consonants[(rand() % strlen($consonants))]; $alt = 0; } else { $password .= $vowels[(rand() % strlen($vowels))]; $alt = 1; } } return $password; } Get IP address
Returns the real IP address of a visitor, even when connecting via a proxy.
Source : http://roshanbh.com.np/2007/12/getting-real-ip-address-in-php.html


function getRealIpAddr(){
if (!empty($_SERVER['HTTP_CLIENT_IP'])){
//check ip from share internet
$ip = $_SERVER['HTTP_CLIENT_IP'];
}
elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])){
//to check ip is pass from proxy
$ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
}
else{
$ip = $_SERVER['REMOTE_ADDR'];
}
return $ip;
}


XSL transformation
PHP5 version
Source : http://www.tonymarston.net/php-mysql/xsl.html


$xp = new XsltProcessor();

// create a DOM document and load the XSL stylesheet
$xsl = new DomDocument;
$xsl->load('something.xsl');

// import the XSL styelsheet into the XSLT process
$xp->importStylesheet($xsl);

// create a DOM document and load the XML datat
$xml_doc = new DomDocument;
$xml_doc->load('something.xml');

// transform the XML into HTML using the XSL file
if ($html = $xp->transformToXML($xml_doc)) {
echo $html;
}
else {
trigger_error('XSL transformation failed.', E_USER_ERROR);
} // if


PHP4 version


function xml2html($xmldata, $xsl){
/* $xmldata -> your XML */
/* $xsl -> XSLT file */

$arguments = array('/_xml' => $xmldata);
$xsltproc = xslt_create();
xslt_set_encoding($xsltproc, 'ISO-8859-1');
$html = xslt_process($xsltproc, $xmldata, $xsl, NULL, $arguments);

if (empty($html)) {
die('XSLT processing error: '. xslt_error($xsltproc));
}
xslt_free($xsltproc);
return $html;
}

echo xml2html('myxmml.xml', 'myxsl.xsl');


Force downloading of a file
Forces a user to download a file, for e.g you have an image but you want the user to download it instead of displaying it in his browser.


header("Content-type: application/octet-stream");

// displays progress bar when downloading (credits to Felix ;-))
header("Content-Length: " . filesize('myImage.jpg'));

// file name of download file
header('Content-Disposition: attachment; filename="myImage.jpg"');

// reads the file on the server
readfile('myImage.jpg');


String encoding to prevent harmful code
Web applications face any number of threats; one of them is cross-site scripting and related injection attacks. The Reform library attempts to provide a solid set of functions for encoding output for the most common context targets in web applications (e.g. HTML, XML, JavaScript, etc)
Source : http://phed.org/reform-encoding-library/


include('Reform.php');
Reform::HtmlEncode('a potentially harmful string');


Sending mail
Using PHPMailer
PHPMailer a powerful email transport class with a big features and small footprint that is simple to use and integrate into your own software.
Source : http://phpmailer.codeworxtech.com/


include("class.phpmailer.php");
$mail = new PHPMailer();
$mail->From = 'noreply@htmlblog.net';
$mail->FromName = 'HTML Blog';
$mail->Host = 'smtp.site.com';
$mail->Mailer = 'smtp';
$mail->Subject = 'My Subject';
$mail->IsHTML(true);
$body = 'Hello
How are you ?';
$textBody = 'Hello, how are you ?';
$mail->Body = $body;
$mail->AltBody = $textBody;
$mail->AddAddress('asvin [@] gmail.com');
if(!$mail->Send())
echo 'There has been a mail error !';

Uploading of files
Using class.upload.php from Colin Verot
Source : http://www.verot.net/php_class_upload.htm


$uploadedImage = new Upload($_FILES['uploadImage']);

if ($uploadedImage->uploaded) {
$uploadedImage->Process('myuploads');
if ($uploadedImage->processed) {
echo 'file has been uploaded';
}
}


List files in directory
List all files in a directory and return an array.
Source : http://www.laughing-buddha.net/jon/php/dirlist/


function dirList ($directory) {
// create an array to hold directory list
$results = array();

// create a handler for the directory
$handler = opendir($directory);

// keep going until all files in directory have been read
while ($file = readdir($handler)) {

// if $file isn't this directory or its parent,
// add it to the results array
if ($file != '.' && $file != '..')
$results[] = $file;
}

// tidy up: close the handler
closedir($handler);

// done!
return $results;
}


Querying RDBMS with MDB2 (for e.g MySQL)
PEAR MDB2 provides a common API for all supported RDBMS.

Source : http://pear.php.net/package/MDB2


// include MDB2 class
include('MDB2.php');

// connection info
$db =& MDB2::factory('mysql://username:password@host/database');
// set fetch mode
$db->setFetchMode(MDB2_FETCHMODE_ASSOC);

// querying data
$query = 'SELECT id,label FROM myTable';
$result = $db->queryAll($query);

// inserting data
// prepare statement
$statement = $db->prepare('INSERT INTO mytable(id,label) VALUES(?,?)');
// our data
$sqlData = array($id, $label);
// execute
$statement->execute($sqlData);
$statement->free();

// disconnect from db
$db->disconnect();



Enjoy...

Shyam-D Man U Love-