我是php的新手,我想弄清楚如何按exif创建日期对图像进行排序。下面的代码是我在本教程中使用的代码:
我只是修改了一点来检索exif数据我正在寻找一个没有数据库的方法,目标是有一个分页的画廊(现在它是分页)排序与最新的第一个
function getPictures() {
global $page, $per_page, $has_previous, $has_next, $DirFoto, $DirThumb;
if ( $handle = opendir($DirFoto) ) {
echo '<ul id="pictures">';
$count = 0;
$skip = $page * $per_page;
if ( $skip != 0 )
$has_previous = true;
while ( $count < $skip && ($file = readdir($handle)) !== false ) {
if ( !is_dir($file) && ($type = getPictureType($file)) != '' )
$count++;
}
while ( $count < $per_page && ($file = readdir($handle)) !== false ) {
if ( !is_dir($file) && ($type = getPictureType($file)) != '' ) {
$exif = exif_read_data("$DirFoto/$file", 0, true);
if ( ! is_dir($DirThumb) ) {
mkdir($DirThumb);
}
if ( ! file_exists($DirThumb.'/'.$file) ) {
makeThumb( $file, $type );
}
echo '<li><a href="'.$DirFoto.'/'.$file.'" title="Photo taken on '.date("F d Y, H:i:s", strtotime($exif['IFD0']['DateTime'])).'">';
echo '<img src="'.$DirThumb.'/'.$file.'" alt="'.date("F d Y, H:i:s", strtotime($exif['IFD0']['DateTime'])).'"/>';
echo '</a></li>';
$count++;
}
}
echo '</ul>';
while ( ($file = readdir($handle)) !== false ) {
if ( !is_dir($file) && ($type = getPictureType($file)) != '' ) {
$has_next = true;
break;
}
}
}
}
我对整个代码进行了一些合理化,这是我的结果:
$ScriptsHead = '
<link type="text/css" media="screen" rel="stylesheet" href="./stile.css"/>
<link type="text/css" rel="stylesheet" href="./js/photoswipe.css"/>
<script type="text/javascript" src="./js/jquery-1.8.3.js"></script>
<script type="text/javascript" src="./js/klass.min.js"></script>
<script type="text/javascript" src="./js/code.photoswipe-3.0.5.min.js"></script>
<script type="text/javascript" src="./js/miophotoswipe.js"></script>
';
function getPictures() {
global $page, $per_page, $has_previous, $has_next, $DirFoto, $DirThumb;
if ( $handle = opendir($DirFoto) ) {
$skip = $page * $per_page;
$images = array(); # empty data structure
while(($file = readdir($handle)) !== false ) {
if($file == '..' || $file == '.' || is_dir($file) || getPictureType($file) == '')
continue;
# only for images
$exif = exif_read_data("$DirFoto/$file", 0, true);
$date = $exif['IFD0']['DateTime']; # everything you like to be ordered
$images[$file] = $date; # associate each file to its date
}
asort($images); # sort the structure by date
echo '<ul id="pictures">';
if ( $skip != 0 )
$has_previous = true;
$count = -1;
foreach ($images as $file => $fileDate) {
$count ++;
if($count < $skip)
continue;
if($count >= $skip + $per_page) {
$has_next = true;
break;
}
if ( ! is_dir($DirThumb) ) {
mkdir($DirThumb);
}
if ( ! file_exists($DirThumb.'/'.$file) ) {
makeThumb( $file, $type );
}
echo '<li><a href="'.$DirFoto.'/'.$file.'" title="Photo taken on '.date("F d Y, H:i:s", strtotime($fileDate)).'">';
echo '<img src="'.$DirThumb.'/'.$file.'" alt="'.date("F d Y, H:i:s", strtotime($fileDate)).'"/>';
echo '</a></li>';
}
echo '</ul>';
}
}
function getPictureType($file) {
$split = explode('.', $file);
$ext = $split[count($split) - 1];
if ( preg_match('/jpg|jpeg/i', $ext) ) {
return 'jpg';
} else if ( preg_match('/png/i', $ext) ) {
return 'png';
} else if ( preg_match('/gif/i', $ext) ) {
return 'gif';
} else {
return '';
}
}
function makeThumb( $file, $type ) {
global $max_width, $max_height, $DirFoto, $DirThumb;
if ( $type == 'jpg' ) {
$src = imagecreatefromjpeg($DirFoto.'/'.$file);
} else if ( $type == 'png' ) {
$src = imagecreatefrompng($DirFoto.'/'.$file);
} else if ( $type == 'gif' ) {
$src = imagecreatefromgif($DirFoto.'/'.$file);
}
if ( ($oldW = imagesx($src)) < ($oldH = imagesy($src)) ) {
$newW = $oldW * ($max_width / $oldH);
$newH = $max_height;
} else {
$newW = $max_width;
$newH = $oldH * ($max_height / $oldW);
}
$new = imagecreatetruecolor($newW, $newH);
imagecopyresampled($new, $src, 0, 0, 0, 0, $newW, $newH, $oldW, $oldH);
if ( $type == 'jpg' ) {
imagejpeg($new, $DirThumb.'/'.$file);
} else if ( $type == 'png' ) {
imagepng($new, $DirThumb.'/'.$file);
} else if ( $type == 'gif' ) {
imagegif($new, $DirThumb.'/'.$file);
}
imagedestroy($new);
imagedestroy($src);
}
/* echo phpinfo(); */
?>
由于代码读取目录并输出HTML,因此您必须对其进行一些更改以执行您想要的操作。我建议首先将文件名读取到一个数组中,并为每个读取的文件调用exif_read_data
。
如果您按文件名键入数组,并且数组的值是exif创建日期,那么您可以调用asort()
按创建日期对数组进行排序。如果文件没有有效的退出创建日期,也许您可以使用服务器上文件的修改时间。
一旦数组按正确的顺序排序,您可以更改下面的while循环
while ( $count < $per_page && ($file = readdir($handle)) !== false ) {
while ( $count < $per_page && ($file = array_shift($sorted_files)) !== false ) {
,其中$sorted_files
为已排序文件数组。
对不起,我现在不能尝试这个解决方案,但它应该是这样的:
<?php
function getPictures() {
global $page, $per_page, $has_previous, $has_next, $DirFoto, $DirThumb;
if ( $handle = opendir($DirFoto) ) {
$images = array(); # empty data structure
while(($file = readdir($handle)) !== false ) {
if ( !is_dir($file) && ($type = getPictureType($file)) != '' )
# only for images
$exif = exif_read_data("$DirFoto/$file", 0, true);
$date = $exif['IFD0']['DateTime']; # everything you like to be ordered
$images[$file] = $date; # associate each file to its date
}
}
asort($images); # sort the structure by date
echo '<ul id="pictures">';
$skip = $page * $per_page;
if ( $skip != 0 )
$has_previous = true;
$count = 0;
while ( $count < $skip && ($file = array_shift($images)) !== false ) {
if ( !is_dir($file) && ($type = getPictureType($file)) != '' )
$count++;
}
# $count = 0;# (???)
while ( $count < $per_page && ($file = array_shift($images)) !== false ) {
$exif = exif_read_data("$DirFoto/$file", 0, true); # it could be avoided
if ( ! is_dir($DirThumb) ) {
mkdir($DirThumb);
}
if ( ! file_exists($DirThumb.'/'.$file) ) {
makeThumb( $file, $type );
}
echo '<li><a href="'.$DirFoto.'/'.$file.'" title="Photo taken on '.date("F d Y, H:i:s", strtotime($exif['IFD0']['DateTime'])).'">';
echo '<img src="'.$DirThumb.'/'.$file.'" alt="'.date("F d Y, H:i:s", strtotime($exif['IFD0']['DateTime'])).'"/>';
echo '</a></li>';
$count++;
}
echo '</ul>';
while ( ($file = readdir($handle)) !== false ) {
if ( !is_dir($file) && ($type = getPictureType($file)) != '' ) {
$has_next = true;
break;
}
}
}
}
?>
请给我一个反馈。欢呼,里卡多。
代码现在可以工作了,如果我将鼠标悬停在工具提示上,将显示正确的日期,但没有加载缩略图或图像。在我的第一个问题中,我省略了最后两个函数,这是我当前的更新代码:
<?php
$page = $_GET['page'];
$has_previous = false;
$has_next = false;
function getPictures() {
global $page, $per_page, $has_previous, $has_next, $DirFoto, $DirThumb;
if ( $handle = opendir($DirFoto) ) {
$images = array();
while(($file = readdir($handle)) !== false ) {
if ( !is_dir($file) && ($type = getPictureType($file)) != '' )
$exif = exif_read_data("$DirFoto/$file", 0, true);
$date = $exif['IFD0']['DateTime'];
$images[$file] = $date;
}
}
asort($images);
echo '<ul id="pictures">';
$skip = $page * $per_page;
if ( $skip != 0 )
$has_previous = true;
$count = 0;
while ( $count < $skip && ($file = array_shift($images)) !== false ) {
if ( !is_dir($file) && ($type = getPictureType($file)) != '' )
$count++;
}
while ( $count < $per_page && ($file = array_shift($images)) !== false ) {
$exif = exif_read_data("$DirFoto/$file", 0, true);
if ( ! is_dir($DirThumb) ) {
mkdir($DirThumb);
}
if ( ! file_exists($DirThumb.'/'.$file) ) {
makeThumb( $file, $type );
}
echo '<li><a href="'.$DirFoto.'/'.$file.'" title="Photo taken on '.date("F d Y, H:i:s", strtotime($exif['IFD0']['DateTime'])).'">';
echo '<img src="'.$DirThumb.'/'.$file.'" alt="'.date("F d Y, H:i:s", strtotime($exif['IFD0']['DateTime'])).'"/>';
echo '</a></li>';
$count++;
}
echo '</ul>';
while ( ($file = readdir($handle)) !== false ) {
if ( !is_dir($file) && ($type = getPictureType($file)) != '' ) {
$has_next = true;
break;
}
}
}
function getPictureType($file) {
$split = explode('.', $file);
$ext = $split[count($split) - 1];
if ( preg_match('/jpg|jpeg/i', $ext) ) {
return 'jpg';
} else if ( preg_match('/png/i', $ext) ) {
return 'png';
} else if ( preg_match('/gif/i', $ext) ) {
return 'gif';
} else {
return '';
}
}
function makeThumb( $file, $type ) {
global $max_width, $max_height;
if ( $type == 'jpg' ) {
$src = imagecreatefromjpeg($DirFoto.'/'.$file);
} else if ( $type == 'png' ) {
$src = imagecreatefrompng($DirFoto.'/'.$file);
} else if ( $type == 'gif' ) {
$src = imagecreatefromgif($DirFoto.'/'.$file);
}
if ( ($oldW = imagesx($src)) < ($oldH = imagesy($src)) ) {
$newW = $oldW * ($max_width / $oldH);
$newH = $max_height;
} else {
$newW = $max_width;
$newH = $oldH * ($max_height / $oldW);
}
$new = imagecreatetruecolor($newW, $newH);
imagecopyresampled($new, $src, 0, 0, 0, 0, $newW, $newH, $oldW, $oldH);
if ( $type == 'jpg' ) {
imagejpeg($new, $DirThumb.'/'.$file);
} else if ( $type == 'png' ) {
imagepng($new, $DirThumb.'/'.$file);
} else if ( $type == 'gif' ) {
imagegif($new, $DirThumb.'/'.$file);
}
imagedestroy($new);
imagedestroy($src);
}
?>