PHP

Sanitize File Names

Users often upload files which have quotes (’, “) in the filenames. Its important that you strip out these characters from the filename before saving the file. For example, a user uploads a file named o’brian.txt . If magic_quotes_gpc settings is turned on for your server, all quotes will be automatically escaped by a backslash.

This additional backslash (\) will result in file name o\‘brian.txt . You might face problems accessing this file through your FTP client. That is, you might not be able to download or delete this file using FTP.

//Sanitize the filename (See note below)
$remove_these = array(' ','`','"','\'','\\','/');
$newname = str_replace($remove_these,'',$_FILES['image']['name']);
//Make the filename unique
$newname = time().'-'.$newname;

Reference
http://phpsense.com/php/php-file-uploading.html

File Root vs DOCUMENT_ROOT

Do not use DOCUMENT_ROOT and use the following...

I found variations in some sites where file path is different from document root.

May be i am not yet clear with what exactly document root does.

anyway here i have my workaround...

session_start();
$file = __FILE__;
if($_SERVER['SERVER_NAME']=='localhost')
$root = str_replace('config\config.php','',$file);
else
$root = str_replace('config/config.php','',$file);
echo '<br>';
echo "root = ".$root;
echo '<br>';
echo "doc root".$_SERVER['DOCUMENT_ROOT'];

Here just get the file path of the current file and replace the filename to get document root.

HAVE TO DISCUSS THIS IN DISCUSSION FORUMS

Get file list from a folder

$docroot = $_SERVER[DOCUMENT_ROOT];
 
$addpath = '' // you can add it like /foldername/foldername if the files are not in the root folder
$list = scandir($docroot.$addpath.'photos/photos');
$list = array_reverse($list);
array_pop($list);array_pop($list);
$images = $list;

The first two entries will '.' and '..' which represents current directory and parent directory. the two array pop us used to remove after reversing the array. if you want you can arrange it in any order by using various php array sort functions.

Math Spam Code

function getscode()
{
	$_SESSION['lo'] =  mt_rand(1,9);
	$_SESSION['ro'] =  mt_rand(1,9);
	return $_SESSION['lo'] .' + '.$_SESSION['ro'];
}
function checkscode($val)
{
	return (($_SESSION['lo'] + $_SESSION['ro'])==$val)?true:false;
}

Force Download

//select fn from tablename where id=$_request[id]
//assume that the file is in the junk named folder
// then the force download script will look like the following
 
$filename = "doc_fgfgfg/$fn";
header("Cache-Control: no-store");
header("Expires: 0");
header("Content-Type: application/octet-stream");
header("Content-disposition: attachment; filename=\"".basename($filename)."\"");
header("Content-Transfer-Encoding: binary");
header('Content-Length: '. filesize($filename));
readfile($filename);

Check domain existence

	if($command=='check_domain')
	{
 		$do = split(',',$domain);
		$flag=1;
  		for($i=0;$i<sizeof($do)-1;$i++){
			$here = dns_get_record($host.$do[$i], DNS_ANY, $authns, $addtl);
 			if($here)
			{
				$str.="<div class='dored'>$host$do[$i] is unavailable</div>";
				$flag*=0;
			}
			else
			{
				$flag*=1;
				$str.="<div class='dogreen'>$host$do[$i] is available</div>";			
			}
		} 	
		if($flag)$str.="<span style='display:none'>bien</span>";
		die($str);		
  	}

Other Resources

PHP IMAP Using Sockets

• PHP - Internet Mail Access Protocol - Using Sockets

XML DOM Document in php

• XML DOM Document in php

Find Files

Program written in php to list all files using recursion

• Find Files using Recursion in PHP

Recursion Example

Program written in php to understand the way find files would work

• Recursion in PHP to find files

Custom Date Functions

These are custom function which can be used for date calculation.

• PHP Date functions

Remove chars from string using regex in php

• Remove chars from string using regex in php

Age Calculation

• Age calculation in php

Remove new line chars carriage return and line feed crlf from a string

     ereg_replace("(\r\n|\n|\r)", "", $str);

Reference

• as ususal php.net

http://www.sourcerally.net/regin/8-The-PHP-coder%27s-top-10-mistakes-and-problems

PHP Project Precautions

• PHP Project Precautions

Replace width and height of the flash embedded code

• Replace width and height of the flash embedded code

PHP array to json string to send it to javascript using ajax

• PHP array to json string to send it to javascript using ajax

Copied from the following URL. For more information refer the following url.

• http://www.bin-co.com/php/scripts/array2json/

Find document_root using __FILE__ instead of using $_SERVER['DOCUMENT_ROOT']

• Find document root using __FILE__ magic constant instead of using $_SERVER of DOCUMENT_ROOT

decrypting query string back into $_GET

• decrypting query string back into GET

convert php stdobject to an array

• convert php stdobject to an array

PHP Sockets - Socket Programming in PHP

• Simple PHP Client Server Socket Program

PHP Find Files and Recursion

• PHP Find Files and Recursion

PHP DOMDocument simple dom xml

• PHP DOMDocument simple dom xml

Parsing chunked encoding in php

• Parsing chunked encoding in php

PHP Image Manipulation

• Padding an image with a background color

Find max value in an associative array

<?php

$array = array(
    0 => array(
        'key1' => '123',
        'key2' => 'values we',
        'key3' => 'do not',
        'key4' => 'care about'
    ),
    1 => array(
        'key1' => '124',
        'key2' => 'values we',
        'key3' => 'do not',
        'key4' => 'care about'
    ),
    2 => array(
        'key1' => '125',
        'key2' => 'values we',
        'key3' => 'do not',
        'key4' => 'care about'
    )
);

echo max(array_column($array, 'key1'));

Reference Highest value of an associative array stackoverflow