php替换内容

<?php
$input = "Hello, world!";
$search = "world";
$replacement = "PHP";

$result = str_replace($search, $replacement, $input);
echo $result; // 输出: Hello, PHP!
?>

<?php
$input = "Hello, world! This is a test.";
$pattern = "/world|test/";
$replacement = "example";

$result = preg_replace($pattern, $replacement, $input);
echo $result; // 输出: Hello, example! This is a example.
?>

<?php
$input = "你好，世界！";
$search = "世界";
$replacement = "PHP";

// 设置字符编码为UTF-8
mb_internal_encoding("UTF-8");

$result = str_replace($search, $replacement, $input);
echo $result; // 输出: 你好，PHP！
?>

<?php
$input = "Hello, world! This is a test.";
$pattern = "/world|test/i"; // 添加i修饰符，忽略大小写
$replacement = "example";

$result = preg_replace($pattern, $replacement, $input);
echo $result; // 输出: Hello, example! This is a example.
?>