如何用其他单词替换文本中以@@开头和以@@结尾的单词 - how to replace words in a text that starts with @@ and ends with @@ with some other words?

how to replace words in a text that starts with @@ and ends with @@ with some other words?

如何用其他单词替换以@@开头和以@@结尾的字符串中的单词?提前感谢

$str = 'This is test @@test123@@';

如何获取test123的位置并替换为另一个

你最好使用正则表达式。

echo $str = preg_replace("~@@(.*?)@@~","This is the replaced text", $str);

示范

正在编辑答案…当OP在不明确的上下文中提出问题时

因为你想要抓取内容。使用preg_match()和相同的正则表达式

<?php
$str = 'This is test @@test123@@';
preg_match("~@@(.*?)@@~", $str, $match);
echo $match[1]; //"prints" test123

并不是说你不应该在这里使用正则表达式，但这里有一个替代方案:

给定:$str = 'This is test @@test123@@';

$new_str = substr($str, strpos($str, "@@")+2, (strpos($str, "@@", $start))-(strpos($str, "@@")+2));

或者，同样的分解:

$start = strpos($str, "@@")+2;
$end = strpos($str, "@@", $start);
$new_str = substr($str, $start, $end-$start);

输出:

echo $new_str; // test123

这种类型的模板标签替换最好使用preg_replace_callback来处理。

$str = 'This is test @@test123@@.  This test contains other tags like @@test321@@.';
$rendered = preg_replace_callback(
    '|@@(.+?)@@|',
    function ($m) {
        return tag_lookup($m[1]);
    },
    $str
);