php数组和foreach？

Question

下面是我试图开始工作的代码,但我对数组的知识非常少foreach.所以它无法正常工作

我需要dropdown使用数组的内容向浏览器显示一个选择表单

我还需要选择项目,如果它是==到$ mycountry最后,我想将美国和英国显示在我的列表顶部

任何人都可以告诉我如何做到这一点

<?PHP
$countries = array(
"217" => "Turkenistan",
"218" => "Turks and Caicos Islands",
"219" => "Tuvalu",
"220" => "Uganda",
"221" => "Ukraine",
"222" => "United Arab Emirates",
"223" => "United Kingdom (Great Britain)",
"224" => "United States");


$mycountry = 224;
?>

<select name="country" style="width:180px;" onChange="do_get_rest_popup(this.value)" /> 
<?php
$countryCounter = 1;
$amtOfCountries = count($countries);
//foreach ($country as $id => $c) {
for( $_top=0; $_top < $amtOfCountries; $_top++ ){ 
    if ($countryCounter == $amtOfCountries) { 
        echo "<option value=\"$countries[0]\" SELECTED>$countries[1]</option>";
    }  else {
        echo "<option value=\"$countries[0]\">$countries[1]</option>";
        $countryCounter++;
    }
}
?>
</select>

Answer 1

foreach ($countries as $key => $country) {
    $selected = ""
    if ($key == $mycountry) $selected = ' selected="selected" ';
    print '<option value=' . $key . $selected . '>' . $country . '</option>';
}

基本上,对于数组中的每个元素,您将其分解为其键及其值(即$ countreis [key] = value).一旦你了解阵列(并且它们可能非常令人困惑),它将使编码容易一百万次.

(出于某种原因,语法高亮/格式化在我的代码中无效...)