Question

我有50个状态的html选择下拉列表，我在PHP中有一个默认状态值。设置默认选择值是否比执行

更简单

<option value="NY" <?php if ($default_state == 'NY') echo 'selected="selected"'; ?>New York</option>

50次？

换句话说，我是否必须对每个选项进行检查？

Answer 1

我创建一个状态缩写数组并循环遍历它们，检查状态是否与默认值匹配，然后附加必要的HTML。

这是一个快速（功能）代码示例。请注意，如果您愿意，可以将数组缩短为两个字母的缩写：

<select>
<?php
$default = "NJ";
$states = array('AL'=>"Alabama",  
            'AK'=>"Alaska",  
            'AZ'=>"Arizona",  
            'AR'=>"Arkansas",  
            'CA'=>"California",  
            'CO'=>"Colorado",  
            'CT'=>"Connecticut",  
            'DE'=>"Delaware",  
            'DC'=>"District Of Columbia",  
            'FL'=>"Florida",  
            'GA'=>"Georgia",  
            'HI'=>"Hawaii",  
            'ID'=>"Idaho",  
            'IL'=>"Illinois",  
            'IN'=>"Indiana",  
            'IA'=>"Iowa",  
            'KS'=>"Kansas",  
            'KY'=>"Kentucky",  
            'LA'=>"Louisiana",  
            'ME'=>"Maine",  
            'MD'=>"Maryland",  
            'MA'=>"Massachusetts",  
            'MI'=>"Michigan",  
            'MN'=>"Minnesota",  
            'MS'=>"Mississippi",  
            'MO'=>"Missouri",  
            'MT'=>"Montana",
            'NE'=>"Nebraska",
            'NV'=>"Nevada",
            'NH'=>"New Hampshire",
            'NJ'=>"New Jersey",
            'NM'=>"New Mexico",
            'NY'=>"New York",
            'NC'=>"North Carolina",
            'ND'=>"North Dakota",
            'OH'=>"Ohio",  
            'OK'=>"Oklahoma",  
            'OR'=>"Oregon",  
            'PA'=>"Pennsylvania",  
            'RI'=>"Rhode Island",  
            'SC'=>"South Carolina",  
            'SD'=>"South Dakota",
            'TN'=>"Tennessee",  
            'TX'=>"Texas",  
            'UT'=>"Utah",  
            'VT'=>"Vermont",  
            'VA'=>"Virginia",  
            'WA'=>"Washington",  
            'WV'=>"West Virginia",  
            'WI'=>"Wisconsin",  
            'WY'=>"Wyoming");

foreach($states as $key=>$val) {
    echo ($key == $default) ? "<option selected=\"selected\" value=\"$key\">$val</option>":"<option value=\"$key\">$val</option>";
}
?>
</select>

在PHP中设置HTML选择控件的默认值

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