10 code snippets for PHP developers
Filed under PHP
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<br/>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 !';
Using Swift Mailer
Swift Mailer is an alternative to PHPMailer and is a fully OOP library for sending e-mails from PHP websites and applications.
Source : http://swiftmailer.org/
// include classes
require_once "lib/Swift.php";
require_once "lib/Swift/Connection/SMTP.php";
$swift =& new Swift(new Swift_Connection_SMTP("smtp.site.com", 25));
$message =& new Swift_Message("My Subject", "Hello<br/>How are you ?", "text/html");
if ($swift->send($message, "asvin [@] gmail.com", "noreply@htmlblog.net")){
echo "Message sent";
}
else{
echo 'There has been a mail error !';
}
//It's polite to do this when you're finished
$swift->disconnect();
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();
Share This
Nov03
November 4, 2008 at 12:16 am
Great list!
But, for protection against XSS exploits, without blocking harmless HTML/CSS, check out http://humanbagel.com/opencode.php Click the XSS Protect link, it’s peer reviewed open source. good stuff.
I especially like the upload files one :)
November 4, 2008 at 5:18 am
glob() does the same thing as dirList() and it also supports wildcards such as glob(“*.txt”)
November 4, 2008 at 8:13 am
Thanks for pointing the way to Swift. Good list.
November 4, 2008 at 8:26 am
Not that these are terrible, but seriously. People who can’t write these themselves, shouldn’t be programming. All of these things could be done by a noobie with some research.
November 4, 2008 at 9:04 am
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November 4, 2008 at 9:04 am
Exactly Jesse you’re right, these are basic things, but this post prevents them from doing the research, having all the useful things under 1 post and discovering some new classes like class.upload.php, EmailAddress validator.
To Kevin, thx for the glob function, didn’t know about that.
November 4, 2008 at 2:21 pm
nice ideas
November 4, 2008 at 5:09 pm
You should include a Content-Length header in the file download example. This way the browser will be able to display a proper progress bar.
November 4, 2008 at 5:33 pm
Thnx Felix, already updated the code ;-)
November 4, 2008 at 5:34 pm
Thanks for the nice list.
But for listing files in directory I prefer the DirectoryIterator [1] in the SPL.
Witi
[1] http://de.php.net/manual/de/class.directoryiterator.php
November 4, 2008 at 6:41 pm
nice
November 4, 2008 at 8:16 pm
Awesome list…will use for sure.
November 5, 2008 at 2:39 am
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November 5, 2008 at 12:20 pm
Why using the php-email-address-validation class ?
The function filter_var exists with good filters for mail verification.
November 5, 2008 at 12:44 pm
filter_var requires PHP 5.2 whereas the php-email-address-validation class can be hacked to work with PHP4 by just removing public/protected from the functions.
November 5, 2008 at 4:14 pm
i agree that all of these are functions that one would encounter if you programmed everyday in a commercial and none commercial environment. I think mixing php4 and 5 oop is not such a great idea
November 5, 2008 at 5:05 pm
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November 6, 2008 at 2:00 pm
Nice snippets. Thanks. Though the mail validator could just use a regex rather than a whole class…
November 7, 2008 at 1:07 pm
Good Job! thanks for share!!!
Greetings
david
November 9, 2008 at 6:12 pm
Here’s a few I’ve written:
/*
Function will parse the content looking for syntax like this:
{function name=”functionName” value=”passVariableData”}
and replace this text with the result of the function. Be sure
that the function called is accessable by the current page.
*/
public function parseContent($content)
{
$pattern = “/\{function name=(['|\"])(.*)(\\1) value=(['|\"])(.*)(\\4)\}/i”;
$matches = preg_match_all($pattern, $content, $pMatches);
if(!empty($pMatches[2][0]))
{
$result = call_user_func($pMatches[2][0], $pMatches[5][0]);
$content = str_replace($pMatches[0][0], $result, $content);
}
/* Add more filters to content here */
return $content;
}
/*
Function will parse content and replace any URLs with a hyperlink.
*/
function parseUrls($originalInput, $target = “_blank”)
{
$originalInput = str_replace(“\n”, ” \n”, $originalInput);
$inputTokens = explode(” “, $originalInput);
$input = “”;
foreach($inputTokens as $token)
{
if(strlen($token) > 5)
{
// check for https://, http://
if((($pos = strpos($token, “http://”)) !== false) ||
(($pos = strpos($token, “https://”)) !== false)||
(($pos = strpos($token, “ftp://”)) !== false))
{
$pref = substr($token, 0, $pos);
$link = substr($token, $pos);
if(strlen($link) > 8) $token = “$pref” . str_replace(array(“\n”, “\r”, ” “), “”, $link) . ““;
}
// check for www.
else if(strpos($token, “www.”) === 0) {
$token = “$token“;
}
}
$input .= $token.” “;
}
return $input;
}
function htmlOptions($theArray, $default = ”, $useKeyVal = false, $useKeyDisp = false)
{
foreach($theArray as $k => $val)
{
$str = “”;
if($userKeyDisp)
$str .= $k;
else
$str .= $val;
$str .= “”;
echo $str;
}
}
November 9, 2008 at 6:18 pm
And here’s a file class I wrote. Very simple and no real documentation but someone might find it interesting/useful:
http://www.abetterframework.com/_include/helpers/file.class.phps
November 10, 2008 at 4:52 am
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November 12, 2008 at 5:20 pm
Nice listing, very informative, thanks.
November 12, 2008 at 5:22 pm
I can’t post my comment!!!
November 13, 2008 at 1:48 am
Interesting code samples
November 13, 2008 at 7:23 am
Thanks for such a time saver. Going to bookmark the code snippets. I know I am going to have to refer back to one of these in the future.
November 13, 2008 at 8:56 am
Ivan, the comments are moderated ;-)
November 14, 2008 at 12:51 pm
Great list thanks so much
November 14, 2008 at 10:09 pm
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November 15, 2008 at 4:40 am
scandir does the same thing as dirList function does.
php built in functions are faster, too — so use it. :)
November 15, 2008 at 5:29 am
Great that solves 2 of my problems instantly!
Cheers!
November 18, 2008 at 4:35 am
Nice tips, thank you for sharing ;)
November 25, 2008 at 1:05 am
great codes. We used something similar to get IP address in our contact form.
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January 5, 2009 at 10:04 pm
Hmmmm. Interesting. Nice list!
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January 11, 2009 at 10:55 am
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January 26, 2009 at 12:59 pm
damn cool man…
February 8, 2009 at 7:15 am
10 code snippets for PHP developers…
A compilations of php snippets….
February 14, 2009 at 12:41 pm
I’ve been searching for PHP codes used for uploading files. At last i found the answer, i even found everything that i need for my exercise. just a Question: How many pages should i create prior to this code?..
March 9, 2009 at 12:06 pm
Thanks dude.
That swift mailer was really good.