我有一个应用程序，在第一个页面上，用户可以选择四种产品。在他保存数据后，我必须显示所有四种产品的列表，并在用户选择的产品旁边放一个"check"。我的逻辑有问题，有人能帮我吗？
// user can choose from these products
$products = array(
'1'=>'Product One',
'2'=>'Product Two',
'3'=>'Product Three',
'4'=>'Product Four' );
// user has choosen these products
$selected_products = explode(',', 'Product One,Product Four');
foreach($selected_products as $product)
{
// Have to print out all products from $products variable, and check
// the ones that the user selected from the $selected_products string.
}
请确保所选产品以ID而非产品名称的形式返回。然后，您可以使用in_array()来确定是否应该选中复选框。
<?php
$products = array(1=>'Product One', 2=>'Product Two', 3=>'Product Three', 4=>'Product Four');
$selectedProducts = array(1,4);
foreach($products as $key => $value) {
$checked = in_array($key, $selectedProducts) ? ' checked' : '';
echo '<input type="checkbox" id="product'.$key.'" value="'.$key.'"'.$checked.' /> <label for="product'.$key.'">'.$value.'</label>';
}
您可以使用in_array()来检查它是否是所选值中的选中选项之一。粗略示例：
$products = array('1'=>'Product One','2'=>'Product Two','3'=>'Product Three','4'=>'Product Four');
// user has choosen these products
$selected_products = explode(',', 'Product One,Product Four');
foreach($products as $id => $p) {
$checked = (in_array($p, $selected_products)) ? 'checked' : '';
echo "<input type='checkbox' name='check' value='{$id}' $checked /> {$p}<br/>";
}
$products = array('1'=>'Product One','2'=>'Product Two','3'=>'Product Three','4'=>'Product Four');
// user has choosen these products
$selected_products = explode(',', 'Product One,Product Four');
foreach($products as $id => $p) {
$checked = (in_array($p, $selected_products)) ? 'checked' : '';
echo "<input type='checkbox' name='check' value='{$id}' $checked /> {$p}<br/>";
}