blocks|key|1359547|text|你的意思是，|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1359548|$template1+=+'<select+name="users">
+++++++++++++++++<option+value="1">Mark</option>
+++++++++++++++++<option+value="2">Jen</option>
+++++++++++++++++<option+value="3">John</option>
++++++++++++++</select>';|code-block|syntax|javascript|1359549|然后在用来构建HTML页面的代码中|1359550|<div><?php+echo+$template1;+?></div>|1359551|或|1359552|echo+'<div>'+.+$template1+.+'</div>';|1359553|entityMap^0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|R|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|S|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|K|3|L|5|6|7|U|8|@]|9|@]|A|$]]|$1|M|3|N|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|O|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|P|$]]

<p>Do you mean,</p>

<pre><code>$template1 = '&lt;select name="users"&gt;
                 &lt;option value="1"&gt;Mark&lt;/option&gt;
                 &lt;option value="2"&gt;Jen&lt;/option&gt;
                 &lt;option value="3"&gt;John&lt;/option&gt;
              &lt;/select&gt;';
</code></pre>

<p>And then in the code you use to build the HTML page</p>

<pre><code>&lt;div&gt;&lt;?php echo $template1; ?&gt;&lt;/div&gt;
</code></pre>

<p>OR</p>

<pre><code>echo '&lt;div&gt;' . $template1 . '&lt;/div&gt;';
</code></pre>


blocks|key|1365464|text|$array[1]+=+'Mark';
$array[2]+=+'Jen';
$array[3]+=+'John';
$select+=+"<select>\n";
foreach+($array+as+$key+=>+$value){
++++$select+.=+"\t<option+value='".$key."'>".$value."</option>\n";
}
$select+.=+"</select>\n";
echo+$select;|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1365465|输出：|unstyled|1365466|<select>
++++<option+value='1'>Mark</option>
++++<option+value='2'>Jen</option>
++++<option+value='3'>John</option>
</select>|1365467|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|L|8|@]|9|@]|A|$]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$B|C]]|$1|I|3|-4|5|F|7|N|8|@]|9|@]|A|$]]]|J|$]]

<pre><code>$array[1] = 'Mark';
$array[2] = 'Jen';
$array[3] = 'John';
$select = "&lt;select&gt;\n";
foreach ($array as $key =&gt; $value){
    $select .= "\t&lt;option value='".$key."'&gt;".$value."&lt;/option&gt;\n";
}
$select .= "&lt;/select&gt;\n";
echo $select;
</code></pre>

<p>Output:</p>

<pre><code>&lt;select&gt;
    &lt;option value='1'&gt;Mark&lt;/option&gt;
    &lt;option value='2'&gt;Jen&lt;/option&gt;
    &lt;option value='3'&gt;John&lt;/option&gt;
&lt;/select&gt;
</code></pre>


blocks|key|1365477|text|最好的方法可能是创建一个函数，该函数使用提供的选项数组和第二个参数来解析dropdown，该参数表示默认情况下选择了哪个选项。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1365478|但是，您也可以使用str_replace()查找具有特定值的行，并将selected属性添加到该行。|offset|length|style|CODE|1365479|entityMap^0|0|9|D|Y|8|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|P|8|@]|9|@]|A|$]]]|I|$]]

<p>The best way, might be to make a function that parses the dropdown for you with a supplied array of options and a second parameter which indicates which one is selected by default.</p>

<p>However, you can also use <code>str_replace()</code> to find a row with a certain value and add the <code>selected</code> attribute to it.</p>


blocks|key|5310287|text|尽管如此，DOMDocument或SimpleXML将非常适合这一点，这就是你的解决方案：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|5310288|$selected+=+'Option+1';
$options++=+array('Option+1',+'Test',+'Blargh',+'Lazr');

$select+=+"<select+name='select1'>\n";
foreach+($option+as+$key+=>+$val)
++++$select+=+"<option+value='{$key}'";
++++if+($val+===+$selected)+{
++++++++$select+.=+"+selected='selected'";
++++}
++++$select+.=+">{$val}</option>\n";
}

$select+.=+"</select>\n";

echo+$select;|code-block|syntax|javascript|5310289|entityMap^0|5|B|H|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

<p>Tho, <code>DOMDocument</code> or <code>SimpleXML</code> would fit this perfect, here goes your solution:</p>

<pre><code>$selected = 'Option 1';
$options  = array('Option 1', 'Test', 'Blargh', 'Lazr');

$select = "&lt;select name='select1'&gt;\n";
foreach ($option as $key =&gt; $val)
    $select = "&lt;option value='{$key}'";
    if ($val === $selected) {
        $select .= " selected='selected'";
    }
    $select .= "&gt;{$val}&lt;/option&gt;\n";
}

$select .= "&lt;/select&gt;\n";

echo $select;
</code></pre>


blocks|key|1365496|text|如果您愿意重新输出HTML值，则很容易在可理解的数组中预选值(值是关键字，文本是$select+KVP的值)：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1365497|<?php
++++$select+=+array(
++++++++'mark'+=>+'Mark',
++++++++'jen'++=>+'Jen',
++++++++'john'+=>+'John'
++++);
++++$preSelected+=+'jen';

++++echo+'<select>';
++++foreach+($select+as+$key+=>+$value)+{
++++++++echo+'<option+value="'+.+$key+.+'"'+.+($key+==+$preSelected+?+'+selected="SELECTED"'+:+'')+.+'>'+.+$value+.+'</option>';
++++}
++++echo+'</select>';
?>|code-block|syntax|javascript|1365498|1365499|输出(带缩进)：|1365500|<select>
++++<option+value="mark">Mark</option>
++++<option+value="jen"+selected="SELECTED">Jen</option>
++++<option+value="john">John</option>
</select>|1365501|entityMap^0|14|7|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|U|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|V|8|@]|D|@]|E|$]]|$1|L|3|M|5|6|7|W|8|@]|D|@]|E|$]]|$1|N|3|O|5|H|7|X|8|@]|D|@]|E|$I|J]]|$1|P|3|-4|5|6|7|Y|8|@]|D|@]|E|$]]]|Q|$]]

<p>If you are willing to re-output the HTML, it's very easy to have a preselected value in an understandable array (the value is the key, and the text is the value of the <code>$select</code> KVP):</p>

<pre><code>&lt;?php
    $select = array(
        'mark' =&gt; 'Mark',
        'jen'  =&gt; 'Jen',
        'john' =&gt; 'John'
    );
    $preSelected = 'jen';

    echo '&lt;select&gt;';
    foreach ($select as $key =&gt; $value) {
        echo '&lt;option value="' . $key . '"' . ($key == $preSelected ? ' selected="SELECTED"' : '') . '&gt;' . $value . '&lt;/option&gt;';
    }
    echo '&lt;/select&gt;';
?&gt;
</code></pre>

<p><a href="http://codepad.org/8Qw8MGNm" rel="nofollow"><strong>CODEPAD DEMO</strong></a></p>

<p>Output (with indentation):</p>

<pre><code>&lt;select&gt;
    &lt;option value="mark"&gt;Mark&lt;/option&gt;
    &lt;option value="jen" selected="SELECTED"&gt;Jen&lt;/option&gt;
    &lt;option value="john"&gt;John&lt;/option&gt;
&lt;/select&gt;
</code></pre>


blocks|key|1359611|text|这是你想做的吗？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1359612|function+renderSelector($attr=array(),$options=array(),$selected=''){
++++if(@count($attr))
++++++++foreach($attr+as+$k=>$v)+$attr[$k]+=+$k.'="'.htmlentities($v).'"';
++++if(@count($options))
++++++++foreach($options+as+$k=>$v)+$options[$k]+=+'<option+value="'.htmlentities($k).'"+'.(($k==$selected)?'selected':'').'>'.$v.'</option>';

++++return+$str+=+'<select+'.implode('+',$attr).'>'.implode('',$options).'</select>';
}

echo+renderSelector(
++++++++$attr=array('name'=>'city'),
++++++++$options=array('NY'=>'Newyork','TK'=>'Tokyo','3'=>'London'),
++++++++$selected='TK'
+++++);|code-block|syntax|javascript|1359613|Demo|offset|length|1359614|entityMap|0|LINK|mutability|MUTABLE|url|http://codepad.org/0jgW52KZ^0|0|0|0|4|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

<p>Is it what you would like to do?</p>

<pre><code>function renderSelector($attr=array(),$options=array(),$selected=''){
    if(@count($attr))
        foreach($attr as $k=&gt;$v) $attr[$k] = $k.'="'.htmlentities($v).'"';
    if(@count($options))
        foreach($options as $k=&gt;$v) $options[$k] = '&lt;option value="'.htmlentities($k).'" '.(($k==$selected)?'selected':'').'&gt;'.$v.'&lt;/option&gt;';

    return $str = '&lt;select '.implode(' ',$attr).'&gt;'.implode('',$options).'&lt;/select&gt;';
}

echo renderSelector(
        $attr=array('name'=&gt;'city'),
        $options=array('NY'=&gt;'Newyork','TK'=&gt;'Tokyo','3'=&gt;'London'),
        $selected='TK'
     );
</code></pre>

<p><a href="http://codepad.org/0jgW52KZ" rel="nofollow">Demo</a></p>


blocks|key|3842228|text|我假设您想做一些类似jQuery的$('option[value=2]').attr('selected',+true)的事情。PHP本身不理解您存储在字符串变量中的任何标记。只有在使用DOM解析器时才有可能。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|3842229|++++$template+=+'<select+name="users">
+++++++++++++<option+value="1">Mark</option>
+++++++++++++<option+value="2">Jen</option>
+++++++++++++<option+value="3">John</option>
++++++++++</select>';
++++$select+=+simplexml_load_string($template1);
++++$selectedValue+=+"2";
++++foreach+($select->children()+as+$option)+{
++++++++if+($option->attributes()->value+==+$selectedValue)+{
++++++++++++$option->addAttribute('selected',+'selected');
++++++++}
++++}
++++$template+=+$select->asXML();|code-block|syntax|javascript|3842230|entityMap^0|H|17|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|P|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|Q|8|@]|D|@]|E|$]]]|L|$]]

<p>I assume you want to do something like jQuery's <code>$('option[value=2]').attr('selected', true)</code>. PHP itself does not understand any markup you store in a string variable. It is only possible with DOM parser. </p>

<pre><code>    $template = '&lt;select name="users"&gt;
             &lt;option value="1"&gt;Mark&lt;/option&gt;
             &lt;option value="2"&gt;Jen&lt;/option&gt;
             &lt;option value="3"&gt;John&lt;/option&gt;
          &lt;/select&gt;';
    $select = simplexml_load_string($template1);
    $selectedValue = "2";
    foreach ($select-&gt;children() as $option) {
        if ($option-&gt;attributes()-&gt;value == $selectedValue) {
            $option-&gt;addAttribute('selected', 'selected');
        }
    }
    $template = $select-&gt;asXML();
</code></pre>


<p>i'm writing a datagrid widget which uses lots of dropdown boxes, eg. having this markup:</p>

<pre><code>&lt;select name="users"&gt;
    &lt;option value="1"&gt;Mark&lt;/option&gt;
    &lt;option value="2"&gt;Jen&lt;/option&gt;
    &lt;option value="3"&gt;John&lt;/option&gt;
&lt;/select&gt;
</code></pre>

<p>i've stored this markup into a variable and i'm wondering if it's possible to set the current value through php? so it's classical string manipulation - but i dont' want to use a library like simple dom parser.. any ideas?
thanks</p>


simple way for parsing/manipulation html in php

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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