我的主要问题是为什么PDO :: exec不会执行我的循环的每次迭代，而只是在第一次迭代中执行。
我正在尝试将坐标插入MySQL数据库。
我的数据库结构是（数字（主键），x，y，z）。
我要求用户插入一个数字（$ n），然后让他们填写$ n套坐标。
用户输入传递到另一个带有$ _POST的页面，然后由动态变量名称检索并插入到数据库中。
一切正常，除了循环只在第一次迭代时写入数据库。所以我最终得到了x1，z1，y1的结果，但没有别的。
任何人都可以解释我做错了什么（不使用数组）？
<?php
require_once('db.php');
$n = $_POST['selectOption'];
for($i = 1; $i < $n+1;$i++){
${'x' . $i} = $_POST["x" . $i];
${'y' . $i} = $_POST["y" . $i];
${'z' . $i} = $_POST["z" . $i];
$rowsAffected = $db->exec("INSERT INTO coordinate3d (number,x,y,z)
VALUES ('$n', '${'x' . $i}', '${'y' . $i}', '${'z' . $i}')");
}
?>
这是我的表格
<form action="aaron_stockdale_dynamic_process.php" method="post" name="coordinateForm">
<?php
for($i = 0; $i < $n; $i++)
{
?>
x<?php echo $i+1;?> <input name="x<?php echo $i+1;?>" type=text>, y<?php echo $i+1;?> <input name="y<?php echo $i+1;?>" type=text>, z<?php echo $i+1;?> <input name="z<?php echo $i+1;?>" type=text><br>
<?php
}
?>
<br>
<input type="hidden" name="selectOption" value="<?php echo $n;?>">
<input type="submit" oonClick="document.location.href='aaron_stockdale_dynamic_process.php'" value="Submit">
</form>
答案 0 :(得分：1)
require_once('aaron_stockdale_database.php');
$n = $_POST['selectOption'];
for($i = 1; $i < $n+1;$i++){
$x = $_POST["x" . $i];
$y = $_POST["y" . $i];
$z = $_POST["z" . $i];
$rowsAffected = $db->exec("INSERT INTO coordinate3d (number,x,y,z)
VALUES ('$n', '$x', '$y', '$z')");
}
剩下的就在你身上;）
并且还检查是否有任何字段是主键，这将阻止插入两次。
答案 1 :(得分：0)
由于您的问题已经收到了可接受的答案，我想向您提供有关您的HTML代码的提示。
<form action="aaron_stockdale_dynamic_process.php" method="post" name="coordinateForm">
<?php
for($i = 0; $i < $n; $i++)
{
?>
x<?php echo $i+1;?> <input name="x<?php echo $i+1;?>" type=text>, y<?php echo $i+1;?> <input name="y<?php echo $i+1;?>" type=text>, z<?php echo $i+1;?> <input name="z<?php echo $i+1;?>" type=text><br>
<?php
}
?>
<br>
<input type="hidden" name="selectOption" value="<?php echo $n;?>">
<input type="submit" oonClick="document.location.href='aaron_stockdale_dynamic_process.php'" value="Submit">
</form>
现在，这段代码可以清理一下。
<form action="aaron_stockdale_dynamic_process.php" method="post" name="coordinateForm">
<?php
for($i = 0; $i < $n; $i++)
{
echo 'x' . $i+1 . '<input name="x' . $i+1 . '" type=text>, y' . $i+1 . ' <input name="y' . $i+1. '" type=text>, z' . $i+1 . '<input name="z' . $i+1 . '" type=text><br>'
}
?>
<br>
<input type="hidden" name="selectOption" value="<?php echo $n;?>">
<input type="submit" value="Submit">
</form>
我将“oonClick”更改为“onClick”，然后我将其删除，就像您提交时一样，您无需导航，因为浏览器会在提交时执行此操作。 然后我删除了重复打开和关闭php标签，并将所有回声合并为一个。
答案 2 :(得分：-1)
这是我在一个文件中的解决方案：
<!DOCTYPE html>
<html lang=en>
<head>
<script>
function validcoord(e) {
var key;
var keychar;
if (window.event)
key = window.event.keyCode;
else if (e)
key = e.which;
else
return true;
keychar = String.fromCharCode(key);
keychar = keychar.toLowerCase();
// control keys
if ((key==null) || (key==0) || (key==8) || (key==9) || (key==13) || (key==27) )
return true;
// Numeral Characters
else if ((("0123456789-.,").indexOf(keychar) > -1))
return true;
else
return false;
}
</script>
<style>
input[type="number"] { text-align: right; width: 50px; }
label { margin-left: 4em; }
</style>
</head>
<body>
<?php
define ("SELF", $_SERVER['PHP_SELF']);
define ("EOL", "\r\n");
// Modify as needed
define ("MINNUMCORDS" , "1");
define ("MAXNUMCORDS" , "10");
define ("DFLTNUMCORDS", "2");
$formSubmitted = (empty($_POST)) ? FALSE : TRUE;
if (!$formSubmitted) {
$htmlOutput = '
<form action="' . SELF . '" method=post name=foo id=foo>
<input type=hidden name=current value=0>
<label>Enter the number of Coordinates:
<input type=number autofocus onFocus="this.select()"' .
' min=' . MINNUMCORDS .
' max=' . MAXNUMCORDS .
' value=' . DFLTNUMCORDS .
' name=numcords /></label>
</form>' . EOL;
echo $htmlOutput;
} // end if not submitted
else { // a form HAS been submitted
foreach ($_POST as $key => $value) { $$key = $value; }
unset($_POST);
if (!empty($coord)) { // We got some input that may be a valid x,y,z coordinate
if ( substr_count($coord, ",") != 2 ) {
$error = "We're looking for THREE numbers seperated by TWO commas.";
} // end if we don't have three values
else { // We got three Values
$coord = trim($coord);
list($x,$y,$z) = explode(",", $coord);
if ( !(is_numeric($x) && is_numeric($y) && is_numeric($z)) ) {
$error = "We're looking for three VALID NUMBERS seperated by two commas.";
} // end if all three numbers are not valid
else { // We got three Values and each of them are numbers
require('db.php');
$rowsAffected = $db->exec("INSERT INTO coordinate3d (number,x,y,z)
VALUES ('$numcords', '$x', '$y', '$z')");
//echo "INSERT INTO coordinate3d (number,x,y,z) VALUES ('$numcords', '$x', '$y', '$z')<br />" . EOL;
} // end three valid numbers
} // end three values
} // end if we have some input in $coord
if ($error) {
echo "~~ " . $error . "<br /><br />" . EOL;
--$current;
} // end if error
if ( $current < $numcords ) {
$htmlOutput = 'Please enter the coordinate in the form: x,y,z (Ex: -.4,2,8.5)' . EOL;
$htmlOutput .= '<form action="' . SELF . '" method=post name=bar id=bar>' . EOL;
$htmlOutput .= ' <input type=hidden name=numcords value="' . $numcords . '" />' . EOL;
$htmlOutput .= ' <input type=hidden name=current value="' . ++$current . '" />' . EOL;
$htmlOutput .= ' <label>Coord #' . $current . ': ';
$htmlOutput .= '<input type=text name=coord size=12 maxlength=48 ' .
'autofocus onKeyPress="return validcoord(event);" /></label>' . EOL;
$htmlOutput .= '</form>' . EOL;
echo $htmlOutput;
} // end if we need to get another coord
} // end form was submitted
?>
</body>
</html>