HTML 字符串的中间,被视为文本,在最接近的句子之后/之前。
例:
$str = 'First sentence. Second sentence! <a title="Hello. World">
Third sentence. </a> Fourth sentence. Fifth sentence?';
$middle = strlen($str) / 2;
我所做的是将关键字附加到所有停止字符,如 .
、!
或 ?
,但仅限于 HTML 标记之外的字符:
$str = 'First sentence. Second sentence! <a title="Hello. World">
Third sentence. </a> Fourth sentence. Fifth sentence?';
$str = preg_replace_callback("/('.|'?|'!)(?!([^<]+)?>)/i", function($matches){
return $matches[1].'<!-- stop -->';
}, $str);
这$str变成:
First sentence.<!-- stop --> Second sentence!<!-- stop --> <a title="Hello.
World"> Third sentence.<!-- stop --> </a> Fourth sentence.<!-- stop --> Fifth
sentence?<!-- stop -->
现在,如何找到最接近$middle
位置的<!-- stop -->
子字符串,并在它之前插入我的文本?
有没有办法在我的preg_replace回调中找到$matches[1]
相对于整个字符串的位置?这样我就可以将其与$middle进行比较
<?php
$str = 'First sentence.<!-- stop --> Second sentence!<!-- stop --> <a title="Hello.
World"> Third sentence.<!-- stop --> </a> Fourth sentence.<!-- stop --> Fifth
sentence?<!-- stop -->';
$str1 = explode('<!-- stop -->',$str);
$str1[round(sizeof($str1)/2)-2].="!Append text!";
$glue=htmlentities('<!-- stop --/>');
echo $str2 = implode($glue,$str1);
?>
这是怎么回事?