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ratio = width / height
width = height * ratio
height = width / ratio

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name
slug
version
author
author_profile
contributors
requires
tested
compatibility
rating

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<?php 
function compose_url(array $server){
	
	// Scheme
	$scheme = '';
	if (isset($server['SERVER_PROTOCOL'])) {
		$scheme = explode('/', $server['SERVER_PROTOCOL']);
		$scheme = strtolower($scheme[0]);
		if (isset($server['HTTPS']) && 'off' != $server['HTTPS']) {
			$scheme .= 's';

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printf syntax

%[parameter][flags][width][.precision][length]type

https://carlalexander.ca/php-string-formatting/

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<?php
$image = imagecreatefrompng( 'trees.png' );
$width = imagesx( $image );
$height = imagesy( $image );

// Create
$output = imagecreatetruecolor($width, $height);

for( $y = 0; $y < $height; $y++ ){
    for( $x = 0; $x < $width; $x++ ){

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Image Processing

Gaussian Blur

• C# How to: Calculating Gaussian Kernels
• Gaussian Kernel Calculator
• How do I gaussian blur an image without using any in-built gaussian functions?
• Implementing Gaussian Blur - How to calculate convolution matrix (kernel)
• Histograms
• Eric Brasseur Gamma

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• C Tutorial
• Pointers in C
• C Online Docu
• Single Quotes vs Double Quotes in C

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SplPriorityQueue Does Not Behave Like a Queue

SplPriorityQueue is advertised as a prioritized queue. Ideally, as a queue, when adding items of the same priority, the items should retain the same order as how they were registered (FIFO). In PHP the order is unexpected:

<?php
$queue = new SplPriorityQueue();
$queue->insert('1',0);
$queue->insert('2',0);
$queue->insert('3',0);

$queue->insert('4',0);

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type	min	max
i8	-128	127
i16	-32768	32767
i32	-2147483648	2147483647
i64	-9223372036854775808	9223372036854775807
u8	0	255
u16	0	65535
u32	0	4294967295
u64	0	18446744073709551615

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// IE >= 11
function triggerEvent(el, eventName, options) {
    var event,
        opts = {detail: options};

    event = newEvent(eventName, opts);
    el.dispatchEvent(event);
}

function newEvent(eventName, options) {