Tutorial Unzip Files

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<?php
$zip = zip_open("zip.zip");
if (is_resource($zip)) {
  while ($zip_entry = zip_read($zip)) {
    $fp = fopen("zip/".zip_entry_name($zip_entry), "w");
    if (zip_entry_open($zip, $zip_entry, "r")) {
      $buf = zip_entry_read($zip_entry, zip_entry_filesize($zip_entry));
      fwrite($fp,"$buf");
      zip_entry_close($zip_entry);
      fclose($fp);
    }
  }
  zip_close($zip);
}
?>

Reference URL

Tutorial Truncate String by Words

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Technique #1

<?php
function trunc($phrase, $max_words) {
   $phrase_array = explode(' ',$phrase);
   if(count($phrase_array) > $max_words && $max_words > 0)
      $phrase = implode(' ',array_slice($phrase_array, 0, $max_words)).'...';
   return $phrase;
}
?>

Technique #2

function limit_words($words, $limit, $append = ' &hellip;') {
       // Add 1 to the specified limit becuase arrays start at 0
       $limit = $limit+1;
       // Store each individual word as an array element
       // Up to the limit
       $words = explode(' ', $words, $limit);
       // Shorten the array by 1 because that final element will be the sum of all the words after the limit
       array_pop($words);
       // Implode the array for output, and append an ellipse
       $words = implode(' ', $words) . $append;
       // Return the result
       return $words;
}

Tutorial Truncate Long String Exactly In Middle

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This will truncate a longer string to a smaller string of specified length (e.g. the "25" value in the code below) while replacing the middle portion with a separator exactly in the middle. Useful when you need to truncate a string but still show the beginning (e.g. for sorting and because it is most recognizable) and also show the end (perhaps to show a file name).

<?php

$longString = 'abcdefghijklmnopqrstuvwxyz0123456789z.jpg';
$separator = '/.../';
$separatorlength = strlen($separator) ;
$maxlength = 25 - $separatorlength;
$start = $maxlength / 2 ;
$trunc =  strlen($longString) - $maxlength;

echo substr_replace($longString, $separator, $start, $trunc);

//prints "abcdefghij/.../56789z.jpg"

?>

Tutorial Time Ago Function

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This can be used for comments and other from of communication to tell the time ago instead of the exact time which might not be correct to some one in another time zone.

The function only uses unix time stamp like the result of time();

Technique #1

<?php
function ago($time)
{
   $periods = array("second", "minute", "hour", "day", "week", "month", "year", "decade");
   $lengths = array("60","60","24","7","4.35","12","10");

   $now = time();

       $difference     = $now - $time;
       $tense         = "ago";

   for($j = 0; $difference >= $lengths[$j] && $j < count($lengths)-1; $j++) {
       $difference /= $lengths[$j];
   }

   $difference = round($difference);

   if($difference != 1) {
       $periods[$j].= "s";
   }

   return "$difference $periods[$j] 'ago' ";
}
?>

Technique #2

function _ago($tm,$rcs = 0) {
   $cur_tm = time(); $dif = $cur_tm-$tm;
   $pds = array('second','minute','hour','day','week','month','year','decade');
   $lngh = array(1,60,3600,86400,604800,2630880,31570560,315705600);
   for($v = sizeof($lngh)-1; ($v >= 0)&&(($no = $dif/$lngh[$v])<=1); $v--); if($v < 0) $v = 0; $_tm = $cur_tm-($dif%$lngh[$v]);

   $no = floor($no); if($no <> 1) $pds[$v] .='s'; $x=sprintf("%d %s ",$no,$pds[$v]);
   if(($rcs == 1)&&($v >= 1)&&(($cur_tm-$_tm) > 0)) $x .= time_ago($_tm);
   return $x;
}

Needs a time() value, and it will tell you how many seconds/minutes/hours/days/years/decades ago.

Tutorial Simple Zipcode Range Tester

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This regex below tests the provided zip code if it starts with the numbers 096 and that there are exactly 2 numbers after it. If it does, it echos Yes, if not, it echos No. In this test case, it would echo Yes. 

<?php
$zipcode='09607';
echo 'Zipcode in range?<br />';
if(preg_match('/^096[0-9]{2}$/', $zipcode))
       echo "Yes";
else
       echo "No";
?>

Tutorial Server Side Image Resizer

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The code uses PHP to resize an image (currently only jpeg). Using this method, the resized image is of much better quality than a browser-side resizing. The file size of the new downsized image is also smaller (quicker to download).

The code comes in two parts:

imageResizer() is used to process the image loadimage() inserts the image url in a simpler format 
<?php

   function imageResizer($url, $width, $height) {

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

		list($width_orig, $height_orig) = getimagesize($url);

		$ratio_orig = $width_orig/$height_orig;

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

		// This resamples the image
		$image_p = imagecreatetruecolor($width, $height);
		$image = imagecreatefromjpeg($url);
		imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig);

		// Output the image
		imagejpeg($image_p, null, 100);
		
	}

	//works with both POST and GET
	$method = $_SERVER['REQUEST_METHOD'];
	
	if ($method == 'GET') {

		imageResize($_GET['url'], $_GET['w'], $_GET['h']);
		
	 } elseif ($method == 'POST') {

	    imageResize($_POST['url'], $_POST['w'], $_POST['h']);
	 }

	// makes the process simpler
	function loadImage($url, $width, $height){
         echo 'image.php?url=', urlencode($url) ,
         '&w=',$width,
         '&h=',$height;
	}

?>

Usage

Above code would be in a file called image.php.

Images would be displayed like this:

<img src="<?php loadImage('image.jpg', 50, 50) ?>"

Tutorial Separate First and Last Name

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$name = "John S Smith";

list($fname, $lname) = split(' ', $name,2);

echo "First Name: $fname, Last Name: $lname";

Works with or without middle name.