PHP查找字符串中的匹配项，更改它，然后使用更新的字符串

<?php
$originalString = "Hello world, this is a test.";
$searchString = "world";
$replaceString = "universe";

// 使用str_replace()函数替换字符串中的匹配项
$updatedString = str_replace($searchString, $replaceString, $originalString);

echo $updatedString; // 输出: Hello universe, this is a test.
?>

<?php
$originalString = "Hello world, this is a test.";
$searchPattern = "/world/"; // 正则表达式模式
$replaceString = "universe";

// 使用preg_replace()函数替换字符串中的匹配项
$updatedString = preg_replace($searchPattern, $replaceString, $original String);

echo $updatedString; // 输出: Hello universe, this is a test.
?>

// 使用str_replace()区分大小写
$updatedString = str_replace(["World", "world"], "universe", $originalString);

// 使用preg_replace()忽略大小写
$updatedString = preg_replace("/world/i", "universe", $originalString);