How to Create a “Sticky” Floating Footer Bar in WordPress
Shape of Web
PHP is the most widely used web based programming language that powers millions of websites including some of the most popular ones like Facebook.
Even after using PHP for years, we stumble upon functions and features that we did not know about. Some of these can be quite useful, yet underused. So, every web developer should keep useful code snippets in a personal library for future reference.
In today’s post we will show you 8 useful code snippets that you probably never heard of.
This function will create a random string that you can use for user id’s etc.
function generate_rand($l){ $c= "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; srand((double)microtime()*1000000); for($i=0; $i<$l; $i++) { $rand.= $c[rand()%strlen($c)]; } return $rand; }
Want to be able to display the source code of any webpage, with line numbering? Here is a simple code snippet to do it. Just modify the url on line 2 at your convenience. Or even better, make a pretty function according to your needs.
<?php $lines = file('http://google.com/'); foreach ($lines as $line_num => $line) { // loop thru each line and prepend line numbers echo "Line #<b>{$line_num}</b> : " . htmlspecialchars($line) . "<br>\n"; }
if ($_SERVER['HTTPS'] != "on") { echo "This is not HTTPS"; }else{ echo "This is HTTPS"; }
This code will be super useful for people managing images or photography website. With it, you can analyze any image and get its dominant color (R, G, or B).
$i = imagecreatefromjpeg("image.jpg"); for ($x=0;$x<imagesx($i);$x++) { for ($y=0;$y<imagesy($i);$y++) { $rgb = imagecolorat($i,$x,$y); $r = ($rgb >> 16) & 0xFF; $g = ($rgb >> & 0xFF; $b = $rgb & 0xFF; $rTotal += $r; $gTotal += $g; $bTotal += $b; $total++; } } $rAverage = round($rTotal/$total); $gAverage = round($gTotal/$total); $bAverage = round($bTotal/$total);
Provide files to the user by forcing them to download.
function force_download($file) { if ((isset($file))&&(file_exists($file))) { header("Content-length: ".filesize($file)); header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename="' . $file . '"'); readfile("$file"); } else { echo "No file selected"; } }
In order to optimize your scripts, you may definitely want to know how many amount of RAM they use on your server. This snippet will check memory and then print initial, final and peak usages.
echo "Initial: ".memory_get_usage()." bytes \n"; /* prints Initial: 361400 bytes */ // let's use up some memory for ($i = 0; $i < 100000; $i++) { $array []= md5($i); } // let's remove half of the array for ($i = 0; $i < 100000; $i++) { unset($array[$i]); } echo "Final: ".memory_get_usage()." bytes \n"; /* prints Final: 885912 bytes */ echo "Peak: ".memory_get_peak_usage()." bytes \n"; /* prints Peak: 13687072 bytes */
When talking about compression, we usually think about files, such as ZIP archives. It is possible to compress long strings in PHP, without involving any archive files. In the following example we are going to utilize the gzcompress() and gzuncompress() functions:
$string= "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc ut elit id mi ultricies adipiscing. Nulla facilisi. Praesent pulvinar, sapien vel feugiat vestibulum, nulla dui pretium orci, non ultricies elit lacus quis ante. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam pretium ullamcorper urna quis iaculis. Etiam ac massa sed turpis tempor luctus. Curabitur sed nibh eu elit mollis congue. Praesent ipsum diam, consectetur vitae ornare a, aliquam a nunc. In id magna pellentesque tellus posuere adipiscing. Sed non mi metus, at lacinia augue. Sed magna nisi, ornare in mollis in, mollis sed nunc. Etiam at justo in leo congue mollis. Nullam in neque eget metus hendrerit scelerisque eu non enim. Ut malesuada lacus eu nulla bibendum id euismod urna sodales. "; $compressed= gzcompress($string); echo"Original size: ". strlen($string)."\n"; /* prints Original size: 800 */ echo"Compressed size: ". strlen($compressed)."\n"; /* prints Compressed size: 418 */ // getting it back $original= gzuncompress($compressed);
When developing a multilingual website, I really like to retrieve the browser language and use this language as the default language for my website. Here’s how I get the language used by the client browser:
function get_client_language($availableLanguages, $default='en'){ if (isset($_SERVER['HTTP_ACCEPT_LANGUAGE'])) { $langs=explode(',',$_SERVER['HTTP_ACCEPT_LANGUAGE']); foreach ($langs as $value){ $choice=substr($value,0,2); if(in_array($choice, $availableLanguages)){ return $choice; } } } return $default; }