php - 在解析html到dom树中，如何在php中按标签拆分字符串？

Question

这是字符串:

<div>This is a test.</div>
<div>This <b>another</b> a test.</div>
<div/>
<div>This is last a test.</div>

我想将以下字符串分隔为这样的数组:

{"This is a test.", "This <b>another</b> a test.", "", "This is last a test."}

任何想法在 php 中这样做？谢谢你。

Answer 1

我假设您的 HTML 格式错误

有很多选项，包括 xpath 和众多库。 Regex is not a good idea .我找到 DOMDocument快速且相对简单。

getElementsByTagName 然后遍历它们获取innerHTML。

示例:

<?php
function get_inner_html( $node ) { 
    $innerHTML= ''; 
    $children = $node->childNodes; 
    foreach ($children as $child) { 
        $innerHTML .= $child->ownerDocument->saveXML( $child ); 
    } 

    return $innerHTML; 
}
$str = <<<'EOD'
<div>This is a test.</div>
<div>This <b>another</b> a test.</div>
<div/>
<div>This is last a test.</div>
EOD;

$doc = new DOMDocument();
$doc->loadHTML($str);
$ellies = $doc->getElementsByTagName('div');
foreach ($ellies as $one_el) {
    if ($ih = get_inner_html($one_el))
        $array[] = $ih;
}
?>
<pre>
<?php print_r($array); ?>
</pre>

// Output
// Note that there would be
// a 4th array elemnt w/o the `if ($ih = get_inner_html($one_el))` check:
Array
(
    [0] => This is a test.
    [1] => This <b>another</b> a test.
    [2] => This is last a test.
)

Try it out here

注:

只要您没有嵌套的 DIVS，上述内容就可以正常工作。如果确实有嵌套，则必须在循环使用 innerHTML 时排除嵌套的子级。

例如，假设您有以下 HTML:

<div>One
    <div>Two</div>
    <div>Three</div>
<div/>
<div>Four
    <div>Five</div>
</div>

以下是如何处理上述问题并获得一个按顺序排列的数组:

处理嵌套

<?php
function get_inner_html_unnested( $node, $exclude ) { 
    $innerHTML= ''; 
    $children = $node->childNodes; 
    foreach ($children as $child) {     
        if (!property_exists($child, 'tagName') || ($child->tagName != $exclude)) 
            $innerHTML .= trim($child->ownerDocument->saveXML( $child ));
    } 

    return $innerHTML; 
}
$str = <<<'EOD'
<div>One
    <div>Two</div>
    <div>Three</div>
<div/>
<div>Four
    <div>Five</div>
</div>
EOD;

$doc = new DOMDocument();
$doc->loadHTML($str);
$ellies = $doc->getElementsByTagName('div');
foreach ($ellies as $one_el) {
    if ($ih = get_inner_html_unnested($one_el, 'div'))
        $array[] = $ih;
}
?>
<pre>
<?php print_r($array); ?>
</pre>

Try it out here