我见过一些问题，询问有关将变量发送到 $.load 中加载的文档，但不从 $.load 中检索变量的问题。
我在下面粘贴了相关的代码；基本上我想要做的是每隔一段时间运行一个 PHP 函数，最初是在页面第一次加载时。
当页面第一次加载时，它运行 getData 函数——一切都按预期工作。但是稍后在页面下方，当我尝试加载 pullData.php 时，srcAverage 不会更新为新值。JS 警报显示 srcAverage 值。
示例：页面第一次运行时，srcAverage 为 X。每 5 秒，我们要加载 pullData.php 并使用新值更新 index.php 上的 srcAverage（更改 X）。
我觉得我做错了一件非常小的事情 - 想法？
连接文件
<?php
define("HOST", "stuff");
define("USER", "stuff");
define("PASSWORD", "stuff");
define("DATABASE", "stuff");
$mysqli = new mysqli(HOST, USER, PASSWORD, DATABASE);
// Connection info above all works as intended
?>
索引.php
<?php
include 'inc/conn.php';
include 'inc/function.php';
$src = "none";
getData($src, $mysqli);
// This initial run of getData works as intended
// Skip to further down
// The JS alert below does NOT reflect the new srcAverage
?>
<script type="text/javascript">
$(document).ready(function() {
setInterval(function() {
// each interval, get first and second values
$("#targetDiv").load("pullData.php");
alert('New value is <?php echo $srcAverage; ?>');
}, 5000); // end setInterval
});
</script>
拉数据.php
<?php
include 'incl/conn.php';
include 'incl/function.php';
$src = "none";
getData($src, $mysqli);
?>
getData 函数（见下面的代码）从不同的表中获取 4 个值，将它们平均在一起（为了排除故障，我将它们全部分开在不同的语句和变量中），然后将变量 srcAverage 设置为平均值。我已经测试了 MySQLi 语句工作正常，并且 srcAverage被函数分配了正确的值。回显或 JS 警报按预期显示值（在此页面上）。但是当通过 load() 加载时，该变量不会传递给 index.php。
函数.php
<?php
function getData($src, $mysqli) {
// Check SRC for specific source
// If no specific source, get average of all sources
// If YES specific source, get that value
global $srcAverage;
if ($src == 'alt') {
if ($stmt = $mysqli->prepare("SELECT value FROM table ORDER BY id DESC LIMIT 1;")) {
$stmt->execute(); // Execute the prepared query.
$stmt->store_result();
$stmt->bind_result($altVal); // get variables from result.
$stmt->fetch();
if($stmt->num_rows == 1) { // The entry exists, good to go
// echo $altVal;
}
} else {
// Either no results pulled or more than one.
echo "Error pulling alternate data!";
return false;
}
}
else {
// Value 1
if ($stmt = $mysqli->prepare("SELECT value FROM table ORDER BY id DESC LIMIT 1;")) {
$stmt->execute(); // Execute the prepared query.
$stmt->store_result();
$stmt->bind_result($firstVal); // get variables from result.
$stmt->fetch();
if($stmt->num_rows == 1) {
// echo $firstVal; // This works as intended
}
} else {
// Either no results pulled or more than one.
echo "Error pulling first value data!";
return false;
}
// Value 2
if ($stmt = $mysqli->prepare("SELECT value FROM table ORDER BY id DESC LIMIT 1;")) {
$stmt->execute(); // Execute the prepared query.
$stmt->store_result();
$stmt->bind_result($secondVal); // get variables from result.
$stmt->fetch();
if($stmt->num_rows == 1) { // The entry exists, good to go
// echo $secondVal;
}
} else {
// Either no results pulled or more than one.
echo "Error pulling second value data!";
return false;
}
// Value 3
if ($stmt = $mysqli->prepare("SELECT value FROM table ORDER BY id DESC LIMIT 1;")) {
$stmt->execute(); // Execute the prepared query.
$stmt->store_result();
$stmt->bind_result($thirdVal); // get variables from result.
$stmt->fetch();
if($stmt->num_rows == 1) { // The entry exists, good to go
// echo $thirdVal;
}
} else {
// Either no results pulled or more than one.
echo "Error pulling third value data!";
return false;
}
// Value 4
if ($stmt = $mysqli->prepare("SELECT value FROM table ORDER BY id DESC LIMIT 1;")) {
$stmt->execute(); // Execute the prepared query.
$stmt->store_result();
$stmt->bind_result($fourthVal); // get variables from result.
$stmt->fetch();
if($stmt->num_rows == 1) { // The entry exists, good to go
// echo $fourthVal;
}
} else {
// Either no results pulled or more than one.
echo "Error pulling fourth value data!";
return false;
}
// So everything up to this point is working fine. Statements grab data as intended, and assign variables.
// We have data - move forward
$srcCount = 4;
$srcTotal = $firstVal + $secondVal + $thirdVal + $fourthVal;
$srcAverage = $srcTotal / $srcCount;
$srcAverage = number_format((float)$srcAverage, 2, '.', '');
// echo "Total: $srcTotal .... Average: $srcAverage";
// If we were to echo above, it would display correctly. Problem is passing the variable to index
return $srcAverage;
}
}
?>