Google 货币转换器 API 和 JavaScript 下拉列表出现 File_get_contents 错误
我创建了一个网站，该网站使用 Google 的货币转换 API 来转换用户从由 JavaScript 提供支持的下拉列表中选择的货币。
提交表单后，我收到以下错误：
file_get_contents(12gbp=?usd) [function.file-get-contents]: failed to open stream:
这立即表明该 URL 是错误的。我不认为是这种情况，因为如果将上述参数直接复制到 Google 的 API
http://www.google.com/ig/calculator?h1=en&q=12gbp=?usd
我收到了我期望的结果：
这是相关代码：
getCurrencyRates.php
<?php
// Feed URL's //
$googleCurrencyApi = 'http://www.google.com/ig/calculator?h1=en&q=';
function currency_convert($googleCurrencyApi, $amount, $master, $slave) {
$result = file_get_contents($googleCurrencyApi . $amount . $master . '=?' . $slave);
$result = str_replace("\xA0", ",", $result);
$expl = explode('"', $result);
if ($expl[1] == '' || $expl[3] == '') {
throw new Exception('An error has occured. Unable to get file contents');
} else {
return array(
$expl[1],
$expl[3]
);
}
}
?>
currency.php
<?php
require 'includes/getCurrencyRates.php';
// Check to ensure that form has been submitted
if (isset($_POST['amount'], $_POST['master'], $_POST['slave'])) {
$amount = trim($_POST['amount']);
$master= $_POST['master'];
$slave = $_POST['slave'];
// Check amount is not empty
if (!empty($amount)) {
// Check amount is higher than 1 inclusive
if ($amount >= 1) {
try {
$conversion = currency_convert($googleCurrencyApi, $amount, $master, $slave);
} catch (Exception $e) {
echo 'Caught exception: ', $e->getMessage();
}
// Check URL has been formed
if ($conversion == false) {
echo 'Sorry, something went wrong';
} else {
echo $conversion[0], ' = ', $conversion[1];
if ($from == $to) {
echo '<p>That was a pointless conversion!</p>';
}
}
} else {
echo 'Number too small. You must enter a number higher than 1 inclusive';
}
} else {
echo 'You must enter a number into amount';
}
}
?>
<body onload="changeList(document.forms['drops'].master)">
<script language="javascript">
var lists = new Array();
// First set of text and values
lists['gbp'] = new Array();
lists['gbp'][0] = new Array(
'usd',
'eur'
);
lists['gbp'][1] = new Array(
'usd',
'eur'
);
// Second set of text and values
lists['usd'] = new Array();
lists['usd'][0] = new Array(
'gbp',
'eur'
);
lists['usd'][1] = new Array(
'gbp',
'eur'
);
// Third set of text and values
lists['eur'] = new Array();
lists['eur'][0] = new Array(
'gbp',
'usd'
);
lists['eur'][1] = new Array(
'gbp',
'usd'
);
</script>
<script language="javascript">
// This function goes through the options for the given
// drop down box and removes them in preparation for
// a new set of values
function emptyList( box ) {
// Set each option to null thus removing it
while ( box.options.length ) box.options[0] = null;
}
// This function assigns new drop down options to the given
// drop down box from the list of lists specified
function fillList( box, arr ) {
// arr[0] holds the display text
// arr[1] are the values
for ( i = 0; i < arr[0].length; i++ ) {
// Create a new drop down option with the
// display text and value from arr
option = new Option( arr[0][i], arr[1][i] );
// Add to the end of the existing options
box.options[box.length] = option;
}
// Preselect option 0
box.selectedIndex=0;
}
// This function performs a drop down list option change by first
// emptying the existing option list and then assigning a new set
function changeList( box ) {
// Isolate the appropriate list by using the value
// of the currently selected option
list = lists[box.options[box.selectedIndex].value];
// Next empty the slave list
emptyList( box.form.slave );
// Then assign the new list values
fillList( box.form.slave, list );
}
</script>
<form name="drops" method="post" action="">
<table border=0 bgcolor="#ffeecc">
<tr>
<td>Amount e.g. 10</td>
<td><input type="text" name="amount" /></td>
</tr>
<tr>
<td>Select from</td>
<td><select name="master" size=1 onchange="changeList(this)">
<option value="gbp">gbp
<option value="usd">usd
<option value="eur">eur
</select>
</td>
</tr>
<tr>
<td>Select to</td>
<td>
<select name="slave" size=1>
<option>Netscape 4 width
</select>
</td>
</tr>
<tr>
<td>
<input type="submit" value="Convert Now" />
</td>
</tr>
</table>
</form>
这个问题是否是在尝试将服务器端语言与客户端语言结合起来时遇到的？
提前致谢。
I've created a website that uses Google's Currency Convert API to convert currencies that a user selects from a drop down list powered by JavaScript.
After submitting the form I get the following error:
file_get_contents(12gbp=?usd) [function.file-get-contents]: failed to open stream:
This immediately suggests to me that the URL is wrong. I don't feel that this is the case because if copy the above arguments into Google's API directly
http://www.google.com/ig/calculator?h1=en&q=12gbp=?usd
I receive the result that I'm expecting:
Here is the relevant code:
getCurrencyRates.php
<?php
// Feed URL's //
$googleCurrencyApi = 'http://www.google.com/ig/calculator?h1=en&q=';
function currency_convert($googleCurrencyApi, $amount, $master, $slave) {
$result = file_get_contents($googleCurrencyApi . $amount . $master . '=?' . $slave);
$result = str_replace("\xA0", ",", $result);
$expl = explode('"', $result);
if ($expl[1] == '' || $expl[3] == '') {
throw new Exception('An error has occured. Unable to get file contents');
} else {
return array(
$expl[1],
$expl[3]
);
}
}
?>
currency.php
<?php
require 'includes/getCurrencyRates.php';
// Check to ensure that form has been submitted
if (isset($_POST['amount'], $_POST['master'], $_POST['slave'])) {
$amount = trim($_POST['amount']);
$master= $_POST['master'];
$slave = $_POST['slave'];
// Check amount is not empty
if (!empty($amount)) {
// Check amount is higher than 1 inclusive
if ($amount >= 1) {
try {
$conversion = currency_convert($googleCurrencyApi, $amount, $master, $slave);
} catch (Exception $e) {
echo 'Caught exception: ', $e->getMessage();
}
// Check URL has been formed
if ($conversion == false) {
echo 'Sorry, something went wrong';
} else {
echo $conversion[0], ' = ', $conversion[1];
if ($from == $to) {
echo '<p>That was a pointless conversion!</p>';
}
}
} else {
echo 'Number too small. You must enter a number higher than 1 inclusive';
}
} else {
echo 'You must enter a number into amount';
}
}
?>
<body onload="changeList(document.forms['drops'].master)">
<script language="javascript">
var lists = new Array();
// First set of text and values
lists['gbp'] = new Array();
lists['gbp'][0] = new Array(
'usd',
'eur'
);
lists['gbp'][1] = new Array(
'usd',
'eur'
);
// Second set of text and values
lists['usd'] = new Array();
lists['usd'][0] = new Array(
'gbp',
'eur'
);
lists['usd'][1] = new Array(
'gbp',
'eur'
);
// Third set of text and values
lists['eur'] = new Array();
lists['eur'][0] = new Array(
'gbp',
'usd'
);
lists['eur'][1] = new Array(
'gbp',
'usd'
);
</script>
<script language="javascript">
// This function goes through the options for the given
// drop down box and removes them in preparation for
// a new set of values
function emptyList( box ) {
// Set each option to null thus removing it
while ( box.options.length ) box.options[0] = null;
}
// This function assigns new drop down options to the given
// drop down box from the list of lists specified
function fillList( box, arr ) {
// arr[0] holds the display text
// arr[1] are the values
for ( i = 0; i < arr[0].length; i++ ) {
// Create a new drop down option with the
// display text and value from arr
option = new Option( arr[0][i], arr[1][i] );
// Add to the end of the existing options
box.options[box.length] = option;
}
// Preselect option 0
box.selectedIndex=0;
}
// This function performs a drop down list option change by first
// emptying the existing option list and then assigning a new set
function changeList( box ) {
// Isolate the appropriate list by using the value
// of the currently selected option
list = lists[box.options[box.selectedIndex].value];
// Next empty the slave list
emptyList( box.form.slave );
// Then assign the new list values
fillList( box.form.slave, list );
}
</script>
<form name="drops" method="post" action="">
<table border=0 bgcolor="#ffeecc">
<tr>
<td>Amount e.g. 10</td>
<td><input type="text" name="amount" /></td>
</tr>
<tr>
<td>Select from</td>
<td><select name="master" size=1 onchange="changeList(this)">
<option value="gbp">gbp
<option value="usd">usd
<option value="eur">eur
</select>
</td>
</tr>
<tr>
<td>Select to</td>
<td>
<select name="slave" size=1>
<option>Netscape 4 width
</select>
</td>
</tr>
<tr>
<td>
<input type="submit" value="Convert Now" />
</td>
</tr>
</table>
</form>
Is this problem experienced from trying to combine a server side language with a client side one?
Thanks in advance.
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评论（1）
希普鲁是对的。它可能与变量作用域有关，实际上并没有关系很有意义。至少对于谷歌来说这不是问题。
Shiplu is right. It may have something to do with variable scope, which really doesn't make much sense. It is not a problem with google at least.