小编Pin*_*uin的帖子

如果善于PHP的人可以建议如何在表达式中验证括号,我会徘徊:

    ( 5 * 3 [ 6 ) - 6]

这是错误的表达.我需要一个功能来做到这一点.这是我到目前为止所尝试的:

<?php
function hasMatchedParenthesis($string) {

$counter1 = 0;
$counter2 = 0;

$length = strlen($string);

for ($i = 0;$i < $length; $i++) {
    $char = $string[$i];
    if( $char == '(' ) {
        $counter1 ++;
    } elseif( $char == ')' ) {
        $counter1 --;
    }

        for($j =0;$j < $length; $j++) {
            $char = $string[$j];
            if( $char == '[' ) {
                $counter2 ++;
        } elseif( $char == ']' ) {
                $counter2 --;
        } …

我正在尝试构建由2个页面组成的小型网站的管理员端:index.php和更新php.在index.php上我运行查询,用数据库中的数据填充html表单,工作正常.然后我通过$ _POST将数据发送到update.php页面,在那里我尝试将这些值转换为变量,然后进行更新查询.哪个失败了.我怀疑$ _POST数组有问题 - 有些值搞砸了或者空了,但我不明白为什么.这是index.php的代码:

<?php
if (!isset($page_id)) {

echo " <p>Please select page to be edited:</p>";

$query = mysql_query("SELECT page_id, title FROM pages");

$res = mysql_fetch_array($query);

do {

printf("<p><a href='index.php?page_id=%s'>%s</a></p>", $res['page_id'], $res['title']);
} while ($res = mysql_fetch_array($query));
} else { $query = mysql_query("SELECT *  FROM pages WHERE page_id = '$page_id'");
$res = mysql_fetch_array($query);



require_once 'parts/form.php';}
?>

这是update.php的代码:

<?php
//Here I try to get POST values and assign them to variables for update
//Ths is validation that those values are …