[英]PHP MySQL multi-dimensional array sort by condition date
I am trying to sort by modification date descending (meaning latest first) within a multi-dimensional array with the condition that status = 0 (unrated image) and status != 1 (rated image). 我试图按状态为0(未分级的图像)和状态== 1(已 分级的图像)的条件,在多维数组中按降序排列的修改日期(意味着最新的优先)进行排序。
Is it possible to sort the array so that the top 2 would be following the logic below: 是否有可能对数组进行排序,以使前2名遵循以下逻辑:
If (there are multiple versions of an image)
If (there is a version that has been rated)
If (there is a new unrated version of the image)
Display (the most recent version that has a rating) and
(the most recent unrated version) as top 2 of array
Else
Display (the most recent version that has a rating) as top 1
Else
Display (the most recent unrated version) as top 1
Else
Display (the only version) as top 1
Here's my UPDATED PHP code below (UPDATED 9/6/2013) : 这是下面我的更新PHP代码(2013年9月6日更新) :
updateImageDisplayStatus($caseID,$patientID);
function updateImageDisplayStatus($caseid,$patientid) {
$connection = getMySqlConnection();
$sql = "SELECT image_name FROM images WHERE patientid = '{$patientid}' AND caseid = '{$caseid}' ";
$imageGroup = array();
$result = mysql_query($sql,$connection);
while($row = mysql_fetch_assoc($result)) {
$fileName = $row['image_name'];
$tmpName = $row['image_name'];
list($leftN,$rightN) = explode($caseid."_",$tmpName);
//$spltName = explode('_',$rightN);
$shortFileName = $rightN;
list($noExtensionFileName,$extension) = explode('.',$shortFileName);
//$extension = '.nii.gz';
list($groupName,$appendDate) = explode('_',$noExtensionFileName);
// echo $groupName = just the original name.
$sql_2 = "SELECT image1.image_name as i1_image_name
,image1.comments as i1_comments
,image1.status as i1_status
,image1.mod_date as i1_mod_date
,image2.image_name as i2_image_name
,image2.comments as i2_comments
,image2.status as i2_status
,image2.mod_date as i2_mod_date
FROM (SELECT CASE WHEN status = 0 THEN 1 ELSE 0 END as rated
,image_name
,comments
,status
,mod_date
FROM images
WHERE image_name like '%{$groupName}%'
ORDER BY 1 ASC, mod_date DESC
LIMIT 1
) image1
LEFT OUTER
JOIN images image2
ON image1.status > 0
AND image2.status = 0
AND image2.mod_date > image1.mod_date
AND image2.image_name like '%{$groupName}%'
AND patientid = '{$patientid}' AND caseid = '{$caseid}'
ORDER BY image2.mod_date DESC
LIMIT 1";
$result_2 = mysql_query($sql_2,$connection);
if($row = mysql_fetch_assoc($result_2)) {
$imageGroup[$groupName] = array();
$imageGroup[$groupName][] = array(
'image_name' => $row['i1_image_name'],
'comments' => $row['i1_comments'],
'status' => $row['i1_status'],
'mod_date' => $row['i1_mod_date']
);
if ( !empty( $row['i2_image_name'] ) ) {
$imageGroup[$groupName][] = array(
'image_name' => $row['i2_image_name'],
'comments' => $row['i2_comments'],
'status' => $row['i2_status'],
'mod_date' => $row['i2_mod_date']
);
}
}
echo "Group $groupName:<br />";
echo "Size of Group:".sizeof($imageGroup[$groupName]).'<br />';
echo $imageGroup[$groupName][0]['image_name'].'<br />';
echo $imageGroup[$groupName][1]['image_name'].'<br />';
}
}
UPDATE: 更新:
Thanks to @gwc for the suggestion to let SQL do the work. 感谢@gwc提出让SQL完成工作的建议。 I forgot to add that the 1-2 images that are searched and sorted have to be within the specified $caseid and $patientid. 我忘了补充说,搜索和排序的1-2张图像必须在指定的$ caseid和$ Patientid之内。 As a result, the first sql statement should be: $sql = "SELECT image_name FROM images WHERE patientid = '{$patientid}' AND caseid = '{$caseid}' ";
结果,第一个sql语句应为: $sql = "SELECT image_name FROM images WHERE patientid = '{$patientid}' AND caseid = '{$caseid}' ";
Updated SQL to limit to within the same patient and case 更新了SQL以将其限制在同一患者和同一病例内
If I understand your problem correctly, you could let SQL do the work for you. 如果我正确理解了您的问题,则可以让SQL为您完成工作。 No loops or arrays required. 无需循环或数组。 The following SQL should return a single row. 以下SQL应该返回一行。 Unfortunately, I don't have a way to test this at the moment so I hope there are no errors in the SQL. 不幸的是,我目前无法测试此方法,因此我希望SQL中没有错误。 This SQL would replace your $sql_2: 此SQL将替换您的$ sql_2:
SELECT image1.patientid
,image1.caseid
,image1.image_name as i1_image_name
,image1.comments as i1_comments
,image1.status as i1_status
,image1.mod_date as i1_mod_date
,image2.image_name as i2_image_name
,image2.comments as i2_comments
,image2.status as i2_status
,image2.mod_date as i2_mod_date
FROM (SELECT CASE WHEN status = 0 THEN 1 ELSE 0 END as rated
,patientid
,caseid
,image_name
,comments
,status
,mod_date
FROM images
WHERE patientid = '{$patientid}'
AND caseid = '{$caseid}'
AND image_name like '%{$group_name}%'
ORDER BY 1 ASC, mod_date DESC
LIMIT 1
) image1
LEFT OUTER
JOIN images image2
ON image1.status > 0
AND image2.patientid = image1.patientid
AND image2.caseid = image1.caseid
AND image2.status = 0
AND image2.mod_date > image1.mod_date
AND image2.image_name like '%{$group_name}%'
ORDER BY image2.mod_date DESC
LIMIT 1
The returned row contains 10 columns: 返回的行包含10列:
The i1_* columns are from the first image and the i2_* columns are from the second image (if there is one). i1_ *列来自第一张图片,i2_ *列来自第二张图片(如果有)。 If there is a rated image, i1_* will represent the most recently modified rated image and i2_* will represent the most recently modified unrated image that was modified after the i1_* image. 如果存在额定图像,则i1_ *将代表最近修改的额定图像,而i2_ *将代表在i1_ *图像之后修改的最近修改的未额定图像。 If there are not unrated images that were modified after the rated image then i2_* will be NULL. 如果没有在额定图像之后修改过的未额定图像,则i2_ *将为NULL。 If there are no rated images, then i1_* will represent the most recently modified unrated image and i2_* will be NULL. 如果没有评级图像,则i1_ *将代表最近修改的未评级图像,而i2_ *将为NULL。
Updated 更新
Here's how I see it being used. 这是我看到它被使用的方式。
$sql_2 = "SELECT image1.patientid
,image1.caseid
,image1.image_name as i1_image_name
,image1.comments as i1_comments
,image1.status as i1_status
,image1.mod_date as i1_mod_date
,image2.image_name as i2_image_name
,image2.comments as i2_comments
,image2.status as i2_status
,image2.mod_date as i2_mod_date
FROM (SELECT CASE WHEN status = 0 THEN 1 ELSE 0 END as rated
,patientid
,caseid
,image_name
,comments
,status
,mod_date
FROM images
WHERE image_name like '%{$group_name}%'
ORDER BY 1 ASC, mod_date DESC
LIMIT 1
) image1
LEFT OUTER
JOIN images image2
ON image1.status > 0
AND image2.patientid = image1.patientid
AND image2.caseid = image1.caseid
AND image2.status = 0
AND image2.mod_date > image1.mod_date
AND image2.image_name like '%{$group_name}%'
ORDER BY image2.mod_date DESC
LIMIT 1";
$result_2 = mysql_query($sql_2,$connection);
if($row = mysql_fetch_assoc($result_2)) {
$imageGroup[$groupName] = array();
$imageGroup[$groupName][] = array(
'image_name' => $row['i1_image_name'],
'comments' => $row['i1_comments'],
'status' => $row['i1_status'],
'mod_date' => $row['i1_mod_date']
);
if ( !empty( $row['i2_image_name'] ) ) {
$imageGroup[$groupName][] = array(
'image_name' => $row['i2_image_name'],
'comments' => $row['i2_comments'],
'status' => $row['i2_status'],
'mod_date' => $row['i2_mod_date']
);
}
}
replaces: 取代:
if (!isset($imageGroup[$groupName]) {
$imageGroup[$groupName] = array();
$sql_2 = "SELECT * FROM images WHERE image_name like '%".$groupName."%'";
$result_2 = mysql_query($sql_2,$connection);
while($row - mysql_fetch_assoc($result_2)) {
$imageGroup[$groupName][] = array( // sort each field as
'image_name' => $row['image_name'],
'comments' => $row['comments'],
'status' => $row['status'], // determines whether image is rated or unrated
'mod_date' => $row['mod_date'] // the date we need to compare
);
}
}
else {
for ($i=0; $i <sizeof($imageGroup[$groupName]); $i++) {
if ($imageGroup[$groupName][$i]['status'] == 0) {
// compare??
}
if ($imageGroup[$groupName][$i]['status'] !== 0) {
// compare??
}
}
}
upon completion, $imageGroup[$groupName]
will contain an array with either one or two elements. 完成后, $imageGroup[$groupName]
将包含带有一个或两个元素的数组。
Hope this is on target. 希望这是目标。 :) :)
Here's an old bit of code you can use: 这是您可以使用的一些旧代码:
class ProductHelper {
// sort products by name
static function sort_name_asc($a,$b) {
return strcmp($a['name'],$b['name']);
}
static function sort_name_desc($a,$b) {
return strcmp($b['name'],$a['name']);
}
// sort products by price
static function sort_price_asc($a,$b) {
return $a['price'] > $b['price'];
}
static function sort_price_desc($a,$b) {
return $a['price'] < $b['price'];
}
// sort products by last update
static function sort_date_asc($a,$b) {
return $a['created'] > $b['created'];
}
static function sort_date_desc($a,$b) {
return $a['created'] < $b['created'];
}
// sort array by sort_order
static function sort_sort_order($a,$b) {
return $a['sort_order'] > $b['sort_order'];
}
function sortProducts($products, $sortMode) {
if (!is_array($products)) return null;
usort($products, 'ProductHelper::sort_'.$sortMode);
return $products;
}
}
Example use: 使用示例:
$ProductHelper = new ProductHelper();
$ProductHelper->sortProducts($array_of_products, "date_desc");
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