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Why Are Some $_POST Values Missing When Present in php://input?
PHP $_POST Values Missing When Present in php://input
When submitting large HTML forms via POST, some $_POST values may be missing in PHP. This occurs despite the values being present in the raw request body accessible via php://input.
The issue arises because PHP modifies certain characters, such as spaces and dots, in field names to comply with the deprecated register_globals setting. As a result, some keys may be altered and absent from $_POST.
To resolve this issue, consider the following workarounds:
Workarounds
- Custom Function: Create a function to parse the php://input and reconstruct the correct $_POST array, accounting for the modified field names.
<code class="php">function getRealPOST() {
$pairs = explode("&", file_get_contents("php://input"));
$vars = array();
foreach ($pairs as $pair) {
$nv = explode("=", $pair);
$name = urldecode($nv[0]);
$value = urldecode($nv[1]);
$vars[$name] = $value;
}
return $vars;
}</code>
- Disable register_globals: Set register_globals to "Off" in your PHP configuration to prevent field name modifications. However, this is not recommended as register_globals is a security risk.
- URL Encode Field Names: Encode the field names in your HTML form using urlencode() to prevent special characters from being modified.
For instance, HTML fragment:
<code class="html"><input type="text" name="my_field.value" value="test"></code>
PHP code:
<code class="php">$my_field_value = $_POST['my_field.value'];</code>
- Use an Alternative Method for Large Forms: Consider using an alternative method, such as multipart/form-data, which is better suited for handling large forms and preserving field names.
The above is the detailed content of Why Are Some $_POST Values Missing When Present in php://input?. For more information, please follow other related articles on the PHP Chinese website!
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