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PHP tutorials Generate thumbnails _php generate thumbnail code
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*/

# Display graphics and connections

function Showdir ($adirectory, $i)

{
Global $browsedir;

$start = $i;

# change $maxcols and $maximages to change the number of rows and columns of small graphs displayed on each page.

$maxcols = 2;
$maximages = 6;
$maximages = $i + ($maximages-3);

# change $imagemaxwidth and $imagemaxheight to change the width and height of the display thumbnail.

$imagemaxwidth = 100;
$imagemaxheight = 100;

# calculates the ratio of height to width.

$imagemaxratio = $imagemaxwidth/$imagemaxheight;

$ndirectory = sizeof ($adirectory);
Echo (Table_start);
for ($i; $i <= $maximages;)
{
Echo (Row_start);
for ($icols =1; $icols <= $maxcols; $icols + +)
{
Echo (Col_start);
$imagefilename = $adirectory [+ + $i];
if (strlen ($imagefilename) >0)
{
$imagepath = $browsedir. " /". $imagefilename;
$imagesize = getimagesize ($imagepath);
if ($imagesize)
{
$imagewidth = $imagesize [0];
$imageheight = $imagesize [1];
$imageratio = $imagewidth/$imageheight;
if ($imageratio > $imagemaxratio)
{
$imageoutputwidth = $imagemaxwidth;
$imageoutputheight = Ceil ($imagemaxwidth/$imagewidth * $imageheight);
}
else if ($imageratio < $imagemaxratio)
{
$imageoutputheight = $imagemaxheight;
$imageoutputwidth = Ceil ($imagemaxheight/$imageheight * $imagewidth);
} else
{
$imageoutputwidth = $imagemaxwidth;
$imageoutputheight = $imagemaxheight;
}

# Display Graphics

Echo (A_start. $imagepath. A_close);
Echo (Img_start. $imagepath. Img_width $imageoutputwidth. Img_height. $imageoutputheight. Img_end);
Echo (line_break. $adirectory [$i]);
Echo (A_end);
}
Echo (Col_end);
}
}
Echo (Row_end);
}
Echo (Table_end);
Pagemenu ($browsedir, $ndirectory, $start);

}

function Pagemenu ($browsedir, $ndirectory, $PG) {

echo "

Page: ";

$PG _num = 1;

for ($img _num = 0; $img _num <= $ndirectory;) {

if ($pg = = $img _num) {
echo " * $pg _num ";
} else {
echo " $pg _num ";
}

# set up other pages of the connection, each page shows four pictures, so the number of pages $pg _num per plus 1, $img _num add 4.

$PG _num = $pg _num + 1;
$img _num = $img _num + 4;

}

echo "n";

}

function Dirtoarray ($browsedir, $extensions)
{

$nextensions = sizeof ($extensions);
$idirectory = 0;
$directory = Dir ($browsedir);

while ($entry = $directory->read ())
{
for ($i =1; $i <= $nextensions; $i + +)
{
$compare = Stristr ($entry, $extensions [$i]);
if (strlen ($compare) = = strlen ($extensions [$i]))
{
$adirectory [+ + $idirectory] = $entry;
Break
}
}
}
$directory->close ();
return $adirectory;
}

#主程序

#变量 $browsedir Placement for the drawing file.

$browsedir = "./images";

# allowed to browse the graphics file extension, placed in the array, can be added by itself.

$extensions [1] = "JPEG";
$extensions [2] = "JPG";
$extensions [3] = "gif";
$extensions [4] = "PNG";
Showdir (Dirtoarray ($browsedir, $extensions), $start);

Define ("Line_break", "
");
Define ("Table_start", "

n "); Define ("Table_end", " n ");
Define ("Row_start", "n ");
Define ("Row_end", "n ");
Define ("Col_start", "n ");
Define ("Col_end", "Nn ");
Define ("Img_start", "define" ("Img_end", ">");
Define ("Img_width", "width=");
Define ("Img_height", "height=");
Define ("A_start", "define" ("A_close", ">");
Define ("A_end", "" ");
?>

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