I am migrating code from PHP 5 to PHP 8 and I got new errors I've never had during 20 years...
Here is PHP 5 code (without errors) :
<?php
if (isset($_POST['valid']) && $_POST['valid'] == '1') {
// Check submission
$errors = array();
if (!$_POST['field']) $errors[] = 'Field : field is required';
if (!count($errors)) {
// database processing is done here.
header('Location:/')
exit();
}
}
<html>
<head>
</head>
<body>
<?php
if (isset($_REQUEST['action']) && ($_REQUEST['action'] == 'add' || $_REQUEST['action'] == 'edit')) {
// edit
if (isset($_GET['action'])) {
if ($_GET['action'] == 'edit') {
foreach($row as $k => $v) {
$_POST[$k] = $v;
}
}
elseif($_GET['action'] == 'add'){
$_POST['field'] = 'default value';
}
}
// show errors from post
if (count($errors)) show_errors($errors);
// show form to add / edit datas
echo '
<form method="post" action="{$_SERVER['PHP_SELF']}">
<input type="hidden" name="action" value="',$_REQUEST['action'],'" />
<input type="text" name="field" id="field" maxlength="100" size="90" value="',$_POST['field'],'">
<input type="text" name="field2" id="field2" maxlength="100" size="90" value="',$_POST['field2'],'">
<input type="submit">
</form>
';
</body>
</html>
Hosted this same code with PHP 8, when I load page ($_GET), I get for each input field this error : Warning: Undefined array key "field"
Is there a way to prevent this error without writing a condition by field to keep quick (and clean) code writing ?
Yohan
