Currency convertor with PHP

function currency_convert($amount, $from, $to){
    $result = file_get_contents("https://www.google.com/finance/converter?a=$amount&from=$from&to=$to");
    $result = explode("<span class=bld>",$result);
    $result = explode("</span>",$result[1]);  
    $converted_amount = preg_replace("/[^0-9\.]/", null, $result[0]);
    echo $converted_amount;
}

currency_convert(1,'gbp','usd');

Function for getting random word from words in brackets

function randomWords($paragraph){ //get one from the words in {}
        preg_match_all('/{(.*?)}/s', $paragraph, $matches);
        foreach($matches[1] as $variations){
            $variations_array = explode('|',$variations);
            $paragraph = str_ireplace('{'.$variations.'}',$variations_array[array_rand($variations_array)],$paragraph);
        }
        return $paragraph;
    }

For example {traces | trails | spots}. Will return one of the words in brackets.

PHP function for downloading images from http

This function will download images from another site , resize them and put suffix (if needed).

function download_resized_jpeg($filename,$width,$height,$suffix){
    $name = explode('/',$filename);
    $newfilename = end($name);

    // Content type
    //header('Content-Type: image/jpeg');

    list($width_orig, $height_orig, $type) = getimagesize($filename);

    $ratio_orig = $width_orig/$height_orig;

    if ($width/$height > $ratio_orig) {
       $width = $height*$ratio_orig;
    } else {
       $height = $width/$ratio_orig;
    }

    // Resample
    $image_p = imagecreatetruecolor($width, $height);
    if ($type == 1)
    {
        $image = imagecreatefromgif($filename);
    }
    elseif ($type == 2)
    {
        $image = imagecreatefromjpeg($filename);
    }
    elseif ($type == 3)
    {
        $image = imagecreatefrompng($filename);
    }
    else
    {
        $image = imagecreatefromwbmp($filename);
    }
    
    if($type==1 or $type==3) //this code below should preserve transparency but I couldn't try it out for now...
    {
        imagealphablending($image_p, false);
        imagesavealpha($image_p, true);
        imagecolortransparent($image_p, imagecolorallocatealpha($image_p, 0, 0, 0, 127));
    }
    
    imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

    // Output
    if ($type == 1)
        imagegif ($image_p, "../pictures/$newfilename$suffix".".gif", 100);
    elseif ($type == 2)
        imagejpeg($image_p, "../pictures/$newfilename$suffix".".jpg", 100);
    elseif ($type == 3)
        imagepng ($image_p, "../pictures/$newfilename$suffix".".png", 0);
    else
        imagewbmp ($image_p, "../pictures/$newfilename$suffix".".bmp", 100);
}

Cross domain access to data on the server PHP

If you are doing a ajax call to retrieve data from your own server on a platform which is set to prevent these ajax calls . To bypass “Access-Control-Allow-Origin” you need to allow cross domain access by including this in your server php code.

header('Access-Control-Allow-Origin: *');

OR – for only one domain

header('Access-Control-Allow-Origin: http//your-domain.com');

I hope this will help you gain access to you cross-domain data.

Display Recent Posts outside the WordPress

How to import recent post from your internal blog to your website without any difficulties.
First you need to create wp-latest-blogs.php file where you include wp-load.php for your wp blog.

< ?php
    /**
    * WoredPress Latest blog entries
    * @package WordPress
    */
    require( './blog/wp-load.php' );
    // Load the recent top 10 posts
    query_posts( 'posts_per_page=10' );
    ?>
    <div id="blogPosts">
    <ul id="blogList">
    < ?php if (have_posts()) : ?>
    < ?php while (have_posts()) : the_post(); ?>
    <li>
    <a href="<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to < ?php the_title_attribute(); ?>">
    < ?php the_title(); ?><span class="date">< ?php the_time('F jS, Y') ?></span></a>
    </li>
    < ?php endwhile; ?>
    < ?php endif; ?>
    </ul>
    </div>

Continue reading “Display Recent Posts outside the WordPress”

Useful predefined PHP functions

print_r(get_defined_vars());

get_defined_vars — Returns an array of all defined variables

print_r(get_defined_functions());

get_defined_functions — Returns an array of all defined functions

You should be careful about the location in the code, because if you are inside a function it will work only for this function.

print_r(get_defined_constants());

get_defined_constants – Returns list all defined constants with their respective values

print_r(get_declared_classes());

get_declared_classes – Returns list all declared classes

print_r(memory_get_usage());

memory_get_usage — Returns the amount of memory allocated to PHP

Create WordPress Plugin

To create a plugin, all you need to do is create a folder and then create a single file. First go to the wp-content/plugins folder, and create a new folder named myPlugin. Inside this new folder, create a file named myPlugin.php. Open the file in a text editor, and paste the following information in it:

< ?php
   /*
   Plugin Name: myPlugin Creator
   Plugin URI: http://www.nikolaynikolov.net
   Description: My fist plugin
   Version: 1.2
   Author: Nikolay Nikolov
   Author URI: http://www.nikolaynikolov.net
   License: GPL2
   */

You can go into the back end to activate your plugin. Of course, this plugin doesn’t do anything, but you can add functionality by yourself.
Continue reading “Create WordPress Plugin”