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HTML表到数组PHP
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我有一个在线学校日历,但我希望在我自己的应用程序中.
不幸的是我无法使用PHP和正则表达式.
问题是表格单元格不是平均分割的,而是每个类别都有变化.
您可以找到时间表here和here.
我试过的正则表达式是这样的：
<td rowspan='(?:[0-9]{1,3})' class='value'>(.+?)<br/>(.+?)<br/>(.+?)<br/><br/><br/></td>
但它无法正常工作！
结束数组必须如下所示：
[0] => Array
(
[0] => maandag //the day
[1] => 1 //lesson period
[2] => MEN, 16, dm //content of the cell
)
我希望这个问题很清楚,因为我不是英国人;)
解决方法:
祝你好运,它会变得棘手……只是’使用HTML解析器’实际上并没有避免主要问题,这是使用rowpans的表的本质.尽管使用HTML Parser解析大量HTML总是很好的建议,但是如果你可以将HTML分解成更小,更可靠的块 – 那么使用其他技术进行解析总是会更优化(但显然更容易HTML中微妙的意外差异).
规范化表格
如果是我,我会从可以检测表开始和结束位置的东西开始(因为即使在使用HTML解析器时我也不想解析整个页面,如果我不需要)：
$table = $start = $end = false;
/// 'Vrijdag' should be unique enough, but will fail if it appears elsewhere
$pos = strpos($html, 'Vrijdag');
/// find your start and end based on reliable tags
if ( $pos !== false ) {
$start = stripos($html, '<tr>', $pos);
if ( $start !== false ) {
$end = stripos($html, '</table>', $start);
}
}
if ( $start !== false && $end !== false ) {
/// we can now grab our table $html;
$table = substr($html, $start, $end - $start);
}
然后由于随意的方式,细胞垂直跨越(但看起来水平均匀),我会选择一个“日”栏并向下工作.
if ( $table ) {
/// break apart based on rows
$rows = preg_split('#</tr>#i', $table);
///
foreach ( $rows as $key => $row ) {
$rows[$key] = preg_split('#</td>#i', $row);
}
}
上面应该给你这样的东西：
array (
'0' => array (
'0' => "<td class='heading'>1",
'1' => "<td rowspan='1' class='empty'>"
'2' => "<td rowspan='5' class='value'>3D<br/>009<br/>Hk<br/><br/><br/>"
...
),
'0' => array (
'0' => "<td class='heading'>2",
'1' => "<td rowspan='2' class='empty'>"
'2' => "<td rowspan='3' class='value'>Hk<br/>"
...
),
)
既然你已经拥有了它,你就可以扫描每一行,并且你在preg_match一个rowspan的位置,你必须在下面的行(在正确的位置)创建该单元格信息的副本,以便实际创建一个完整的表格结构(没有rowpans).
/// can't use foreach here because we want to modify the array within the loop
$lof = count($rows);
for ( $rkey=0; $rkey<$lof; $rkey++ ) {
/// pull out the row
$row = $rows[$rkey];
foreach ( $row as $ckey => $cell ) {
if ( preg_match('/ rowspan=.([0-9]+)./', $cell, $regs) ) {
$rowspan = (int) $regs[1];
if ( $rowspan > 1 ) {
/// there was a gotcha here, I realised afterwards i was constructing
/// a replacement pattern that looked like this '$14$2'. Which meant
/// the system tried to find a group at offset 14. To get around this
/// problem, PHP allows the group reference numbers to be wraped with {}.
/// so we now get the value of '$1' and '$2' inserted around a literal number
$newcell = preg_replace('/( rowspan=.)[0-9]+(.)/', '${1}'.($rowspan-1).'${2}', $cell);
array_splice( $rows[$rkey+1], $ckey, $newcell );
}
}
}
}
上面应该规范化表格,以便行窗口不再是问题.
(请注意以上是理论代码,我手动输入它并且还没有测试它 – 我将很快这样做)
经过测试
上面有一些我已更新的小错误,即以错误的方式获取某些函数的php参数…在对它们进行排序之后,它似乎有效：
/// grab the html
$html = file_get_contents('http://www.cibap.nl/beheer/modules/roosters/create_rooster.php?element=CR13A&soort=klas&week=37&jaar=2012');
/// start with nothing
$table = $start = $end = false;
/// 'Vrijdag' should be unique enough, but will fail if it appears elsewhere
$pos = strpos($html, 'Vrijdag');
/// find your start and end based on reliable tags
if ( $pos !== false ) {
$start = stripos($html, '<tr>', $pos);
if ( $start !== false ) {
$end = stripos($html, '</table>', $start);
}
}
/// make sure we have a start and end
if ( $start !== false && $end !== false ) {
/// we can now grab our table $html;
$table = substr($html, $start, $end - $start);
/// convert brs to something that wont be removed by strip_tags
$table = preg_replace('#<br ?/>#i', "\n", $table);
}
if ( $table ) {
/// break apart based on rows (a close tr is quite reliable to find)
$rows = preg_split('#</tr>#i', $table);
/// break apart the cells (a close td is quite reliable to find)
foreach ( $rows as $key => $row ) {
$rows[$key] = preg_split('#</td>#i', $row);
}
}
else {
/// create so we avoid errors
$rows = array();
}
/// changed this here from a foreach to a for because it seems
/// foreach was working from a copy of $rows and so any modifications
/// we made to $rows while the loop was happening were ignored.
$lof = count($rows);
for ( $rkey=0; $rkey<$lof; $rkey++ ) {
/// pull out the row
$row = $rows[$rkey];
/// step each cell in the row
foreach ( $row as $ckey => $cell ) {
/// pull out our rowspan value
if ( preg_match('/ rowspan=.([0-9]+)./', $cell, $regs) ) {
/// if rowspan is greater than one (i.e. spread across multirows)
$rowspan = (int) $regs[1];
if ( $rowspan > 1 ) {
/// then copy this cell into the next row down, but decrease it's rowspan
/// so that when we find it in the next row we know how many more times
/// it should span down.
$newcell = preg_replace('/( rowspan=.)([0-9]+)(.)/', '${1}'.($rowspan-1).'${3}', $cell);
array_splice( $rows[$rkey+1], $ckey, 0, $newcell );
}
}
}
}
/// now finally step the normalised table and get rid of the unwanted tags
/// that remain at the same time split our values in to something more useful
foreach ( $rows as $rkey => $row ) {
foreach ( $row as $ckey => $cell ) {
$rows[$rkey][$ckey] = preg_split('/\n+/',trim(strip_tags( $cell )));
}
}
echo '<xmp>';
print_r($rows);
echo '</xmp>';
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