PHP Display Images from Directory

Here Is the how the display Images from the Folder (Directory).
1) The file contains making Thumbnail from the Images.  

<?php
/* function:  generates thumbnail */
function make_thumb($source,$destination,$desired_width) {
 /* read the source image */
 $source_image = imagecreatefromjpeg($source);
 $width = imagesx($source_image);
 $height = imagesy($source_image);
 /* Set the Height Width Of the thumbnail, relative to the desired width  */
 $desired_height = floor($height*($desired_width/$width));
 /* create a new, "virtual" image */
 $virtual_image = imagecreatetruecolor($desired_width,$desired_height);
 /* copy source image at a resized size */
 imagecopyresized($virtual_image,$source_image,0,0,0,0,$desired_width,$desired_height,$width,$height);
 /* create the physical thumbnail image to its destination */
 imagejpeg($virtual_image,$dest);
}
/* function:  returns files from dir */
function get_files($images_dir,$exts = array('jpg')) {
 $files = array();
 if($handle = opendir($images_dir)) {
  while(false !== ($file = readdir($handle))) {
   $extension = strtolower(get_file_extension($file));
   if($extension && in_array($extension,$exts)) {
    $files[] = $file;
   }
  }
  closedir($handle);
 }
 return $files;
}
/* function:  returns a file's extension */
function get_file_extension($file_name) {
 return substr(strrchr($file_name,'.'),1);
}
?>

2) Actual File which you have to run in your browser for result.

<?php
$images_dir = 'preload-images/';
$thumbs_dir = 'preload-images-thumbs/';
$thumbs_width = 200;
$images_per_row = 3;
/** generate photo gallery **/
$image_files = get_files($images_dir);
if(count($image_files)) {
$index = 0;
foreach($image_files as $index=>$file) {
$index++;
$thumbnail_image = $thumbs_dir.$file;
if(!file_exists($thumbnail_image)) {
$extension = get_file_extension($thumbnail_image);
if($extension) {
make_thumb($images_dir.$file,$thumbnail_image,$thumbs_width);
}
}
echo '<a href="',$images_dir.$file,'" >< img src="',$thumbnail_image,'" /></a>';
if($index % $images_per_row == 0) { echo '<div class="clear"></div>'; }
}
echo '<div class="clear"></div>';
}
else {
    echo '<p>There are no images in this gallery.</p>';
}
?>

You can enter your CSS classies and change the display style of the images.

PDF FIle creation in PHP

Here is the simple code from which you can create pdf page which containts the "Hello world" string written in it.

Introspection in PHP

Introspection is the ability of a program to examine an object's characteristics, such as its name, parent class (if Exist), properties, and methods. With introspection, you can write code that operates on any class or object. You don't need to know which methods or properties are defined when you write your code; instead, you can discover that information at runtime, which makes it possible for you to write generic debuggers, serializers, profilers, etc. In this section, we look at the introspective functions provided by PHP.

It have mainly two parts

Examining Classes

Examining an Object

Examining Classes

To determine whether a class exists or not.

Function used for that

1)      class_exists( )

2)      get_declared_classes( )

Syntax:

Boolean class exists(String classname)

      Returns that the class with the name exits or not.

Array get_declared_classes( )

       

        Returns the declare classes in the current page or belongs to the current page.

Examining an Object

Functions for the examing object

1)      method_exists();

Syntax

            Boolean method_exists(object obj, String method_name);

Check whether the method name dedined  in the method is exist in the given class object.

2) get_parent_class( )

Syntax

                                         

            String  get_parent_class( Object obj)

Returns the parent class of the object variable is exist.

3) get_class_methods()

Array get_class_methods(string class name)

Returns the all methods that are defines in the class

4)  get_class_vars()

Syntax

Array get_class_vars( String Class name)

Returns the Class variables .

To check the object and its method just followa the steps:

1) Determing where the variable is object or not: With method  isobject(var)

2) Find that is have any parent class or not with the help of the method get_parent_class(Object)

3) Then get the methods and the variables of the class from the methos

get_class_methods(string class name)

get_class_vars( String Class name)

4) Display it on the screen

IT Compines and Their Headqater

Google

        Headquarter:- Googleplex, Mountain View, California, US

        Founder:-     1) Larry page

                            2) Sergey brin

Apple

        Headquarter:- Apple Campus, 1 Infinite Loop,Cupertino, California, US

        Founder:-     1) Steve Jobs

                            2) Steve Wozniak

                            3) Ronald Wayne

Asus

        Headquarter:- Beitou District, Taipei, Taiwan

        Founder:-     1) T.H. Tung

                            2) Ted Hsu

AMD(Advanced Micro Devices)

        Headquarter:- One AMD Place, Sunnyvale, California, US

        Founder:-        1) Jerry Sanders

Microsoft

        Headquarter:- Microsoft Redmond Campus,Redmond, Washington DC, US

        Founder:-       Bill Gates

Intel

        Headquarter:- Santa Clara, California, US

        Founder:-     1) Gordon Moore

                            2) Robert Noyce

 

Hp

            Headquarter:- Palo Alto, California, US

            Founder:-     1) Bill Hewlett

                                2) David Packard

 Dell

        Headquarter:- 1 Dell Way, Round Rock, Texas, US

        Founder:-        Michael Dell

Samsung

            Headquarter:- Samsung Town, Seoul, South Korea

            Founder:-     Lee Byung

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