How to implement word replacement in php

How to implement word replacement in php: first create a PHP sample file; then define a variable; finally implement the word through "preg_replace('/\bHello\b/', 'NEW', $text);" Just replace it.

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

Specific questions:

How to implement word replacement in php? PHP string replace matches the whole word

I want to replace the whole word using php

Example:

If I have

$text = "Hello hellol hello, Helloz";

I use

$newtext = str_replace("Hello",'NEW',$text);

The new text should look like this

NEW hello1 hello, Helloz

PHP returns

NEW hello1 hello, NEWz

How to implement:

You want to use regular expressions. \b matches word boundaries.

$text = preg_replace('/\bHello\b/', 'NEW', $text);

If $text contains UTF-8 text, you must add the Unicode modifier "u" so that non-Latin characters are not misinterpreted as word boundaries:

$text = preg_replace('/\bHello\b/u', 'NEW', $text);

Recommended learning:《PHP video tutorial》

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