我需要从这个字符串中取出单词并在sql语句中用AND LIKE / NOT LIKE替换,但是我想把它弄出去试图解决它: - )
$string = "hello -world !someword ! again |foo &foo AND foo ORfoo";
if (preg_match_all("/AND|OR|\||&|!|\-(\w+)/", "$string", $matches)) {
foreach ($matches as $match) {
foreach ($match as $m) {
// 1. figure out what the delimiter was (!, |, &, -, AND, OR
// 2. create a sql statement from it using the word following the delimiter
// Example:
if ($m = "!") {
$where .= " AND msg NOT like '%".$m."%'";
}
if ($m = "AND") {
$where .= " AND msg like '%".$m."%'";
}
if ($m = "OR") {
$where .= " OR msg like '%".$m."%'";
}
}
}
}
echo $where;
答案 0 :(得分:2)
使用以下代码收集正则表达式匹配项。请记住,preg_match_all用于收集给定模式的所有实例。请注意,我使用的是preg_match。 “\ s *”允许您匹配空格(如果存在)。
$results = array();
$word_to_capture = '\s*(\w+)%';
$patterns[] = "%(AND)" . $word_to_capture;
$patterns[] = "%(&)" . $word_to_capture;
$patterns[] = "%(OR)" . $word_to_capture;
$patterns[] = "%(\|)" . $word_to_capture;
$patterns[] = "%(!)" . $word_to_capture;
$patterns[] = "%(-)" . $word_to_capture;
foreach($patterns as $p):
preg_match($p,$string,$matches);
$results[] = $matches;
endforeach;
然后,您可以遍历$ results数组以创建MySQL查询。生成的数组将如下所示。
Array
(
[0] => Array
(
[0] => AND foo
[1] => AND
[2] => foo
)
[1] => Array
(
[0] => &foo
[1] => &
[2] => foo
)
[2] => Array
(
[0] => ORfoo
[1] => OR
[2] => foo
)
[3] => Array
(
[0] => |foo
[1] => |
[2] => foo
)
[4] => Array
(
[0] => !someword
[1] => !
[2] => someword
)
[5] => Array
(
[0] => -world
[1] => -
[2] => world
)
)
我在正则表达式中添加了一个额外的捕获。您的不同模式将位于元素1中,而单词将位于元素2中。
您可以使用以下代码创建查询片段:
$query_fragment = "";
foreach($results as $r):
switch (trim($r[1])):
case "AND":
$query_fragment .= " AND msg LIKE '%" . $r[2] . "%'";
break;
case "!":
$query_fragment .= " AND msg NOT LIKE '%" . $r[2] . "%'";
break;
case "&":
$query_fragment .= " AND msg LIKE '%" . $r[2] . "%'";
break;
case "OR":
$query_fragment .= " OR msg LIKE '%" . $r[2] . "%'";
break;
case "|":
$query_fragment .= " OR msg LIKE '%" . $r[2] . "%'";
break;
endswitch;
endforeach;
答案 1 :(得分:1)
您需要单独捕获触发器。那就是:
/(AND|OR|\|&|!-)(\w+)/
您的表达式目前仅捕获短划线后面的单词。
循环也不正确。你想要像
这样的东西foreach ($matches[1] as $count => $match) {
if ($match == '!') {
$where . = " AND msg NOT LIKE '%" . $matches[2][$count] . "%'";
}
}
SQL注入也可能是您关注的问题。