如何捕获和归档文件名
我在PHP中尝试过使用preg_replace_callback,但我不知道如何正确使用它。
function upcount_name_callback($matches) {
//var_export($matches);
$index = isset($matches[3]) ? intval($matches[3]) + 1 : 1;
return '_' . $index;
}
$filename1 = 'news.jpg';
echo preg_replace_callback('/^(([^.]*?)(?:_([0-9]*))?)(?:'.|$)/', 'upcount_name_callback', $filename1, 1);
$filename2 = 'aw_news_2.png';
echo preg_replace_callback('/^(([^.]*?)(?:_([0-9]*))?)(?:'.|$)/', 'upcount_name_callback', $filename2, 1);
输出(错误(:
array (
0 => 'news.',
1 => 'news',
2 => 'news',
3 => '1',
)
_1jpg <= wrong - filename1
array (
0 => 'aw_news_2.',
1 => 'aw_news_2',
2 => 'aw_news',
3 => '2',
)
_3png <= wrong - filename2
输出(正确(:
news_1 <= filename1
aw_news_3 <= filename2
您也可以使用T-Regx库:
pattern('^(([^.]*?)(?:_([0-9]*))?)(?:'.|$)')
->replace('name.jpg')
->first()
->callback(function (Match $m) {
$index = $m->matched(3) ? $m->group(3)->toInt() + 1 : 1;
return '_' . $index;
}
function my_replace_callback ($matches)
{
$index = isset ($matches [1]) ? $matches [1] + 1 : 1;
return "_$index";
}
$file = 'news.jpg';
$file = preg_replace_callback ('/(?:_([0-9]+))?'..*$/', 'my_replace_callback', $file);
print ($file);
$file = 'aw_news.jpg';
$file = preg_replace_callback ('/(?:_([0-9]+))?'..*$/', 'my_replace_callback', $file);
print ($file);
$file = 'news_4.jpg';
$file = preg_replace_callback ('/(?:_([0-9]+))?'..*$/', 'my_replace_callback', $file);
print ($file);
$file = 'aw_news_5.jpg';
$file = preg_replace_callback ('/(?:_([0-9]+))?'..*$/', 'my_replace_callback', $file);
print ($file);
function upcount_name_callback($matches) {
$index = isset($matches[3]) ? intval($matches[3]) + 1 : 1;
return $matches[2] . '_' . $index;
}
$filename1 = 'news.jpg';
echo preg_replace_callback('/^(([^.]*?)(?:_([0-9]*))?)(?:('..*)|$)/', 'upcount_name_callback', $filename1);
$filename2 = 'aw_news_2.png';
echo preg_replace_callback('/^(([^.]*?)(?:_([0-9]*))?)(?:('..*)|$)/', 'upcount_name_callback', $filename2);