Pri izdelavi spletnih strani velikokrat potrebujemo namišljene slike, ki prikazujejo prostor za bodoče bannerje. Placehold.it vam ponuja hitro in enostavno izdelavo statične slike z izpisom dimenzije. Ogledali si bomo primer kode v PHPju, ki nam omogoča prav to.
Placehold.it uporablja kratko varianto, kjer za URL naslovom vpišemo še dimenzije slike, npr.: http://placehold.it/350×150. V našem primeru bomo dodali še barvo ozadja in barvo besedila.
PHP(index.php)
if(isset($_GET)){
$imagedata = explode('-',$_GET['data']);
if (!is_array($imagedata) || count($imagedata) != 4){
die("Something wrong there!! It should be like - placeholder/350-150-CCCCCC-969696");
}
create_image($imagedata[0], $imagedata[1], $imagedata[2], $imagedata[3]);
exit;
}
function create_image($width, $height, $bg_color, $txt_color )
{
$text = "$width X $height";
//Create the image resource $image = ImageCreate($width, $height); //Making of colors, we are changing HEX to RGB $bg_color = ImageColorAllocate($image, base_convert(substr($bg_color, 0, 2), 16, 10),
base_convert(substr($bg_color, 2, 2), 16, 10),
base_convert(substr($bg_color, 4, 2), 16, 10));
$txt_color = ImageColorAllocate($image, base_convert(substr($txt_color, 0, 2), 16, 10),
base_convert(substr($txt_color, 2, 2), 16, 10),
base_convert(substr($txt_color, 4, 2), 16, 10));
//Fill the background color ImageFill($image, 0, 0, $bg_color);
//Calculating font size $fontsize = ($width>$height)? ($height / 10) : ($width / 10) ;
//Inserting Text imagettftext($image,$fontsize, 0, ($width/2) - ($fontsize * 2.75), ($height/2) + ($fontsize* 0.2), $txt_color, 'Crysta.ttf', $text);
//Tell the browser what kind of file is come in header("Content-Type: image/png");
//Output the newly created image in png format imagepng($image);
//Free up resources
ImageDestroy($image);
}
.htaccess
RewriteEngine On
RewriteRule ^([a-zA-Z0-9_-]+)/$ index.php?data=$1
Skrajšano verzijo Placehold.it klona, kjer je potreben samo vpis dimenzije najdete na banner.jiga.org. Primer uporabe banner.jiga.org/300-250.
Vir: http://www.motyar.info/2010/09/create-image-placeholder-with-php.html
Russell Heimlich
Placehold.it is based on dummyimage.com which has the full source code for download http://dummyimage.com/#download