php 替换一次

<?php
// 基本替换
$original = "Hello World!";
$find = "World";
$replace = "PHP";
$result = str_replace($find, $replace, $original);
echo $result; // 输出: Hello PHP!

// 大小写敏感替换
$original = "Hello world!";
$find = "world";
$replace = "PHP";
$result = str_replace($find, $replace, $original);
echo $result; // 输出: Hello PHP!

// 大小写不敏感替换
$original = "Hello world!";
$find = "WORLD";
$replace = "PHP";
$result = str_ireplace($find, $replace, $original);
echo $result; // 输出: Hello PHP!
?>

<?php
$original = "Hello World!";
$find = "world";
$replace = "PHP";
$result = str_ireplace($find, $replace, $original);
echo $result; // 输出: Hello PHP!
?>

<?php
$original = "Hello World! Welcome to the world of PHP.";
$find = array("World", "world");
$replace = array("PHP", "编程");
$result = str_replace($find, $replace, $original);
echo $result; // 输出: Hello PHP! Welcome to the world of 编程.
?>