我不明白為什麼這段程式碼沒有將標題變成正確的鏈接

Question

我的資料庫中有以下字串：

"Minecraft is a sandbox video game developed by Mojang Studios from Sweden. Its concept revolve around procedurally generated world made of cubic blocks.

Minecraft is the best-selling game in history, having over 238 millions of copies sold.

<h1>Gameplay</h1>

Minecraft is played from first-person perspective. Gameplay includes mining, crafting, combat, building and terraforming. Usually when a new single-player game is started, a player is placed into a procedurally generated world. The player can encounter various "mobs"...

我正在嘗試從字串中提取標題值，並使用以下程式碼將其轉換為連結

$heading='';
    $match1=array();
    $matched=preg_match("/<h\d>/",$part,$match1,PREG_OFFSET_CAPTURE);
    if($matched)
    {
        $match2=array();

        preg_match("#</h\d>#",$part,$match2,PREG_OFFSET_CAPTURE);
        $heading= substr($part,$match1[0][1]+4,$match2[0][1]);
        $heading="<a href='$heading'>$heading</a>";
    }

我期望「標題」變數為 ，但結果是

P粉715228019

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P粉7764125972023-09-12 18:15:37 1樓

基於@theforthbird 的評論- 您可以使用單一正則表達式捕獲您想要的字串，儘管通常使用正則表達式解析HTML 會導致一個痛苦的世界，所以雖然這可能適合您當前的目的，但如果您需要沿著這些路線做更多的事情，最好將HTML 解析為DOM 並提取您需要的內容。

$heading = '';
preg_match('/<h(\d)>(.*?)<\/h>/', $string, $matches);

// print_r($matches); # uncomment this to see everything that was 'matched' by this regex

if (!empty($matches[2])) {
    $heading = "<a href='{$matches[2]}'></a>";
}

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Answer 1

基於@theforthbird 的評論- 您可以使用單一正則表達式捕獲您想要的字串，儘管通常使用正則表達式解析HTML 會導致一個痛苦的世界，所以雖然這可能適合您當前的目的，但如果您需要沿著這些路線做更多的事情，最好將HTML 解析為DOM 並提取您需要的內容。

$heading = '';
preg_match('/<h(\d)>(.*?)<\/h>/', $string, $matches);

// print_r($matches); # uncomment this to see everything that was 'matched' by this regex

if (!empty($matches[2])) {
    $heading = "<a href='{$matches[2]}'></a>";
}