PHP 字符串替换匹配整个单词
我想用 php 替换完整的单词
I would like to replace just complete words using php
示例:如果我有
$text = "Hello hellol hello, Helloz";
我用
$newtext = str_replace("Hello",'NEW',$text);
新文本应该看起来像
新的 hello1 你好，Helloz
NEW hello1 hello, Helloz
PHP 返回
NEW hello1 你好，NEWz
NEW hello1 hello, NEWz
谢谢.
推荐答案
您想使用正则表达式. 匹配单词边界.
You want to use regular expressions. The matches a word boundary.
$text = preg_replace('/Hello/', 'NEW', $text);
<小时>
如果 $text 包含 UTF-8 文本，则必须添加 Unicode 修饰符u"，以便非拉丁字符不会被误解为单词边界:
If $text contains UTF-8 text, you'll have to add the Unicode modifier "u", so that non-latin characters are not misinterpreted as word boundaries:
$text = preg_replace('/Hello/u', 'NEW', $text);
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