Making Usage Statistics in PHP - Before Saying Goodbye
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Put the picture making part of your program to the beginning of your main PHP that produces HTML output! Use the isset() function that makes you able to check whether a variable is set or not.
An example: you have a huge code in an index.php file with an if (isset($gd)) condition at the beginning. The output of the index.php is HTML, if there's no $gd set and if there is, then the output is image. Imagine that you can include pictures with echoing a simple <img src=?gd=> tag. My favourite usage of this is the code below (thanks to Jack Shieh). It shows a thumbnail of the images stored in a MySQL table.
if
(isset($pic_id)) {
$q='SELECT Picture FROM images WHERE ID='.$pic_id;
$pic_r=mysql_query($q) or print(mysql_error());
$pic=mysql_fetch_array($pic_r);
header("Content-type: image/jpeg");
$size=80; // new image width
$src=imagecreatefromstring($pic['Picture']);
$width=imagesx($src); $height=imagesy($src);
$aspect_ratio = $height/$width;
if ($width <= $size) {
$new_w = $width;
$new_h = $height;
} else {
$new_w = $size;
$new_h = abs($new_w * $aspect_ratio);
}
$img = imagecreatetruecolor($new_w,$new_h);
imagecopyresized (img,$src,0,0,0,0,$new_w,$new_h,$width,$height);
imagejpeg($img);
}
$q='SELECT ID FROM images';
$ids_r=mysql_query($q) or print(mysql_error());
echo "<table width=100%><tr>";
while ($ids=mysql_fetch_array($ids_r))
echo "<td><img src=?pic_id=".$ids['ID']."></td>n";
echo "</tr></table>";
I hope that now you can track your visitors and make graphical statistics easily as well. I wish you the experience of being visited - and I wish you saw your success also in the statistics!
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