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print strlen("This is a String"); // prints 16
PHP operators are characters
Artithmetic Operators
OperatorDescription
+Addition
-Subtraction
*Multiplication
/Division
%Modulus (remainder of a division)
++Increment
--Decrement
Assignment Operator
Op… Read Morekeep your session secure php
Use SSL when authenticating users or performing sensitive operations.
Regenerate the session id whenever the security level changes (such
as logging in). You can even regenerate the session id every request if
you wish.
H… Read MoreYou want to extract part of a string, starting at a particular place in the string
Use substr( ) to select your
substrings:
$substring = substr($string,$start,$length);
$username = substr($_REQUEST['username'],0,8);
… Read Moreconvert time in php
<?php
$thishour = time() + (4*60*60);
$newTime = date("d m Y H:i:s",$thishour);
echo $newTime;
?>);
… Read MoreSQL Injection Attacks
This appeared to be an entirely custom application, and we had no
prior knowledge of the application nor access to the source code:
this was a "blind" attack.
A bit of poking showed that this server ran Microsoft's IIS 6 alo… Read MoreOpening a Remote File
You want to open a file that's accessible to you via HTTP or FTP.
Pass the file's URL to fopen( ):
$fh = fopen('http://www.example.com/robots.txt','r') or die($php_errormsg);
When fopen( ) is passed … Read MoreApache-Specific Functions
These functions enable you to access Apache internal
features—they form a high-level interface to some Apache API functions.
Consequently, these functions are available only if you have compiled PHP as an
Apache module. … Read MoreControl Structures
if
else
elseif/else if
Alternative syntax for control structures
while
do-while
for
foreach
break
continue
switch
declare
return
require
include
require_ once
include_ once
goto
… Read Moresend images to mail box
<?php
$message = "<html><head></head><body>";
$message .= "<img src='http://exp.com/images/logo.jpg' alt='' />
</body>
</html>";
$cleanedFrom="admin@abfdgd.com";
$headers = "Fr… Read MoreXML file using the DOM API
//Use PHP's DOM XML extension. Here's how
to read XML from a file:
$dom = domxml_open_file('books.xml');
//Here's how to read XML from a variable:
$dom = domxml_open_mem($books);
//You can also get just a single node. H… Read MoreSQL Injection Prevention
the value should only be a positive integer value, since it's an id
number. We do sometimes use other variables that could be a letter, or a
string of text, for example, the search results pages.
$variable = "0";
if (is… Read MoreChecking if a Host Is Alive
Use PEAR's
Net_Ping package:
require 'Net/Ping.php';
$ping = new Net_Ping;
if ($ping->checkhost('www.oreilly.com')) {
print 'Reachable';
} else {
print 'Unreachable';
}
$data = $ping->ping('www.oreilly.com… Read MorePHP Redirect - Redirect Script?
PHP Redirect Function
header('Location: destination.php');
exit();
ou need the Location: part so the browser knows what header it's
receiving. Also, don't forget to
do an exit() or die() right after… Read MoreChanging File Permissions by php
Use chmod( ) to change the
permissions of a file:
chmod('/home/user/secrets.txt',0400);
Use chown( ) to change a
file's owner and chgrp( ) to change a file's group:
<?php
chown('/tmp/myfile.txt','skla… Read MorePhp get_meta_tags-Extracts all meta tag content attributes
get_meta_tags — Extracts all meta tag content attributes from a file and returns an array
<?php// Assuming the above tags are at www.example.com$tags = get_meta_tags('htt… Read More