MikeyHacky Philippines

The Only Enemy of Web Designers

Add comment May 9, 2009

How to Resize an Image Using PHP

Source:http://www.4wordsystems.com/php_image_resize.php

Part I: The HTML Form

<form action="upload.php" method="post" enctype="multipart/form-data" > <input type="file" name="uploadfile"/> <input type="submit"/> </form>

Part II: Getting at the file, resizing the image, and saving to the server. (upload.php)

<?php


// This is the temporary file created by PHP

$uploadedfile = $_FILES['uploadfile']['tmp_name'];
// Create an Image from it so we can do the resize

$src = imagecreatefromjpeg($uploadedfile);
// Capture the original size of the uploaded image

list($width,$height)=getimagesize($uploadedfile);
// For our purposes, I have resized the image to be

// 600 pixels wide, and maintain the original aspect

// ratio. This prevents the image from being "stretched"

// or "squashed". If you prefer some max width other than

// 600, simply change the $newwidth variable

$newwidth=600;

$newheight=($height/$width)*$newwidth;

$tmp=imagecreatetruecolor($newwidth,$newheight);
// this line actually does the image resizing, copying from the                            original

// image into the $tmp image

imagecopyresampled($tmp,$src,0,0,0,0,$newwidth,$newheight,$width,$height);
// now write the resized image to disk. I have assumed that you                            want the

// resized, uploaded image file to reside in the ./images subdirectory.

$filename = "images/". $_FILES['uploadfile']['name'];

imagejpeg($tmp,$filename,100);

imagedestroy($src); imagedestroy($tmp); // NOTE: PHP will clean up the temp file it created when the request // has completed. ?>

Add comment May 5, 2009

Get Email From a String in PHP

<?php

/*

Snippet Name: Get Emails from Strings

Author : Hermawan Haryanto

Email : hermawan@codewalkers.com

Homepage: http://hermawan.com

Blog : http://hermawan.codewalkers.com

*/

function get_emails ($str)

{

$emails = array();

preg_match_all("/\b\w+\@\w+[\.\w+]+\b/", $str, $output);

foreach($output[0] as $email) array_push ($emails, strtolower($email));

if (count ($emails) >= 1) return $emails;

else return false;

}

# Here is how to use it.

# Sample string containing email addresses;

$str = "test test@test.com ha ha heHe@test.com bla bla bla@test.com";

# Get the emails on arrays;

$emails = get_emails ($str);

# Print that arrays;

print_r ($emails);

?>

Add comment March 26, 2009

There Are Only 10 Types of People In This World

Those who can understand binary, and those who cannot.

Source: somewhere in the internet…

Add comment March 23, 2009

A PHP Class To Manage Processes In Linux

I found this helpful snippet of code on PHP.net when I was searching for a way to start and stop processes initiated by exec().

/* An easy way to keep in track of external processes.
* Ever wanted to execute a process in php, but you still wanted to have somewhat controll of the process ? Well.. This is a way of doing it.
* @compability: Linux only. (Windows does not work).
* @author: Peec
*/
class Process{
private $pid;
private $command;
public function __construct($cl=false){
if ($cl != false){
$this->command = $cl;
$this->runCom();
}
}
private function runCom(){
$command = 'nohup '.$this->command.' > /dev/null 2>&1 & echo $!';
exec($command ,$op);
$this->pid = (int)$op[0];
}
public function setPid($pid){
$this->pid = $pid;
}
public function getPid(){
return $this->pid;
}
public function status(){
$command = 'ps -p '.$this->pid;
exec($command,$op);
if (!isset($op[1]))return false;
else return true;
}
public function start(){
if ($this->command != '')$this->runCom();
else return true;
}
public function stop(){
$command = 'kill '.$this->pid;
exec($command);
if ($this->status() == false)return true;
else return false;
}
}

1 comment March 7, 2009

Installing MRTG on Linux

Website: http://oss.oetiker.ch/mrtg/

Full installation documentation at http://oss.oetiker.ch/mrtg/doc/mrtg-unix-guide.en.html

PREREQUISITES:

These are other software that are needed for MRTG to be installed correctly

GCC compiler
Perl
Gd library
Libpng library
Zlib (needed by libpng)
SNMP (Simple Network Management Protocol)

LIBRARY COMPILATION:

First let’s create a directory for the compilation. Note that this may already exist on your system. No problem, just use it.

mkdir -p /usr/local/src
cd /usr/local/src

If you do not have zlib installed:

wget http://www.gzip.org/zlib/zlib-1.1.4.tar.gz
gunzip -c zlib-*.tar.gz | tar xf -
rm zlib-*.tar.gz
mv zlib-* zlib
cd zlib
./configure
make
cd ..

If you don’t have libpng installed

wget http://public.planetmirror.com/pub/sourceforge/l/li/libpng/libpng-1.0.15.tar.gz
gunzip -c libpng-*.tar.gz |tar xf -
rm libpng-*.tar.gz
mv libpng-* libpng
cd libpng*
make -f scripts/makefile.std CC=gcc ZLIBLIB=../zlib ZLIBINC=../zlib
rm *.so.* *.so
cd ..

And now you can compile gd

The \ characters at the end of the following lines mean that all the following material should actually be written on a single line.

For versions starting around 2.0.11, try:

 wget http://www.boutell.com/gd/http/gd-2.0.11.tar.gz
 gunzip -c gd-2.0.11.tar.gz |tar xf -
 mv gd-2.0.11 gd
 cd gd
 env CPPFLAGS="-I../zlib -I../libpng" LDFLAGS="-L../zlib -L../libpng" /
        ./configure --disable-shared --without-freetype --without-jpeg
 make
 cp .libs/* .

MRTG Installation

mkdir -p /usr/local/src/mrtg

cd /usr/local/src/mrtg

wget http://oss.oetiker.ch/mrtg/pub/mrtg-2.15.2.tar.gz

cd mrtg-2.15.2

./configure –prefix=/usr/local/mrtg-2

make && make install

That’s it. MRTG is now installed in the prefixed directory: /usr/local/mrtg-2

Net-SNMP Installation

mkdir -p /usr/local/src/snmp

cd /usr/local/src/snmp

wget http://nchc.dl.sourceforge.net/sourceforge/net-snmp/net-snmp-5.2.4.tar.gz

tar zxvf net-snmp-5.2.4.tar.gz

Configure your SNMP package

cd /usr/local/src/snmp/net-snmp-5.2.4

./configure –prefix=/usr/local/net-snmp

Note: You will be asked some questions regarding setting up SNMP such as the following:

(a.) Default version of SNMP to use: Choose 2

(b.) System Contact Information: type in your email address

(c.) System Location: Type in the location of this box (City-Country)

(d.) Location to write log file: /var/log/snmpd.log

(e.) Location to write persistent information: /var/net-snmp

Compile and install SNMP

make && make install

Configuration of snmpd.conf

Create the etc directory to hold your snmpd.conf file.

mkdir -p /usr/local/net-snmp/etc

Create the snmpd.conf

vi /usr/local/net-snmp/etc/snmpd.conf

##Copy and paste the following##

#############Start of snmpd.conf###########################
#
# snmpd.conf
#
# – created by Tek Limbu on 05-Dec-2007
#
#######################################################
# SECTION: System Information Setup
#
# This section defines some of the information reported in
# the “system” mib group in the mibII tree.

# syslocation: The [typically physical] location of the system.
# Note that setting this value here means that when trying to
# perform an snmp SET operation to the sysLocation.0 variable will make
# the agent return the “notWritable” error code. IE, including
# this token in the snmpd.conf file will disable write access to
# the variable.
# arguments: location_string

syslocation Sweden

# syscontact: The contact information for the administrator
# Note that setting this value here means that when trying to
# perform an snmp SET operation to the sysContact.0 variable will make
# the agent return the “notWritable” error code. IE, including
# this token in the snmpd.conf file will disable write access to
# the variable.
# arguments: contact_string

syscontact mikeyhacky@gmail.com

#####################################################
# SECTION: Access Control Setup
#
# This section defines who is allowed to talk to your running
# snmp agent.

# rocommunity: a SNMPv1/SNMPv2c read-only access community name
# arguments: community [default|hostname|network/bits] [oid]

rocommunity MyPass333

#Disk size in Megabytes (MB).

disk /usr

disk /var

#################End of snmpd.conf########################

The most important data in any SNMP configuration is the community string which can be compared to a password. In the above snmpd.conf file, the rocommunity stands for read-only community string which has the value “MyPass333″. As with passwords, this has to be kept as as secret!

Run the SNMP daemon using the above snmpd.conf file.

/usr/local/net-snmp/sbin/snmpd -c /usr/local/net-snmp/etc/snmpd.conf

Test to see if SNMP is working and functioning properly.

/usr/local/net-snmp/bin/snmpwalk -v2c -c MyPass333 localhost system

You should see something like the following:

###############################################

SNMPv2-MIB::sysDescr.0 = STRING: Linux gw-npj-sp 2.6.18-4-686 #1 SMP Mon Mar 26 17:17:36 UTC 2007 i686
SNMPv2-MIB::sysObjectID.0 = OID: NET-SNMP-MIB::netSnmpAgentOIDs.10
SNMPv2-MIB::sysUpTime.0 = Timeticks: (168913) 0:28:09.13
SNMPv2-MIB::sysContact.0 = STRING: tekbdrlimbu@hotmail.com
SNMPv2-MIB::sysName.0 = STRING: linux-box-hostname
SNMPv2-MIB::sysLocation.0 = STRING: Kathmandu-Nepal
SNMPv2-MIB::sysORLastChange.0 = Timeticks: (0) 0:00:00.00

##############################################

Creating your 1st MRTG graph using SNMP (assuming that DocumentRoot is located at /var/www/html)

mkdir -p /usr/local/mrtg-2/etc

mkdir -p var/www/html/mrtg/traffic [var/www/html/ is the DocumentRoot of the server, change this if necessary]

/usr/local/mrtg-2/bin/cfgmaker –output=/usr/local/mrtg-2/etc/mrtg.cfg /

–global “workdir: /var/www/html/mrtg/traffic” /

-ifref=ip –global ‘options[_]: growright,bits’ MyPass333@localhost

[localhost should be the URL or IP address of the server]

Finally run the mrtg tool to generate the graphs.

env LANG=C /usr/local/mrtg-2/bin/mrtg /usr/local/mrtg-2/etc/mrtg.cfg

Generate your index.html file using the tool called indexmaker which comes with the MRTG package.

/usr/local/mrtg-2/bin/indexmaker –title=”Traffic Status” /usr/local/mrtg-2/etc/mrtg.cfg /

> var/www/html/mrtg/traffic/index.html

We need to setup an entry in the cron table to update the MRTG graphs every 5 minutes. On a Linux or FreeBSD machine, you can do it the following way:

vi /etc/crontab

##### Copy and paste the following #####

*/5 * * * * root env LANG=C /usr/local/mrtg-2/bin/mrtg /usr/local/mrtg-2/etc/mrtg.cfg > /dev/null 2>&1

There you have it. Your graphs will update every 5 minutes indicating the traffic flow in your eth0 network interface.

Add comment February 27, 2009

MikeyHacky Philippines

The Only Enemy of Web Designers

How to Resize an Image Using PHP

Source:http://www.4wordsystems.com/php_image_resize.php

Part I: The HTML Form

Part II: Getting at the file, resizing the image, and saving to the server. (upload.php)

Get Email From a String in PHP

There Are Only 10 Types of People In This World

A PHP Class To Manage Processes In Linux

Installing MRTG on Linux

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