如何在PHP中设置选择框中默认值

Question

<?php 
$options = array('volvo'=>'Volvo', 'saab' =>'Saab', 'audi' => 'Audi'); 
echo "<select name='sss'>\n"; 
foreach ($options as $k=>$v) echo "<option value='$v' >$k</option>\n"; 
echo "</select>\n"; 
?> 

问：

如何使“奥迪”作为默认值，而不是“沃尔沃”？我知道我们可以在html中设置'selected'，但我怎么能在这个PHP脚本中做到这一点？

Answer 1

你可以检测是否默认值是你想要的，并插入你已经确定的HTML：

$defaultVal = 'Audi'; 
foreach ($options as $k=>$v) { 
    $selected = ($v == $defaultVal) ? " selected='selected'" : ""; 
    echo "<option value='$v'$selected>$k</option>\n"; 
} 

Answer 2

为outputing选择

function showSelect($name, $options, $selected, $attr = array()){ 
    $str = "<select name='".$name.'"'; 
    foreach($attr as $name=>$val){ 
     $str.= " ".$name."='".$val."'"; 
    } 
    $str.=">"; 
    foreach($options as $k=>$val){ 
     $str.= "<option value='".$val."'".($val==$selected?" selected='selected'":"").">".$k.'</option>'; 
    } 
    $str.="</select>"; 
    return $str; 
} 

然后打电话给我通常会创建一个辅助功能只是

echo showSelect("sss", $options, "audi", array("id"=>"manufacturer")); 

Answer 3

Try this: 

$options = array('volvo'=>'Volvo', 'saab' =>'Saab', 'audi' => 'Audi'); 
$select_value = 'audi'; 

<select id="test" name="test"> 
<?php foreach($option as $row) {?> 
    <option value="<?php echo $row?>" <?php echo (strcmp($select_value,$row)==0) ?"selected='selected":'' ?>><?php echo $row?></option> 
    <?php } ?> 
</select>