PHP 字符串替换匹配整个单词

PHP string replace match whole word

提问by NVG

I would like to replace just complete words using php

我想用 php 替换完整的单词

Example : If I have

示例：如果我有

$text = "Hello hellol hello, Helloz";

and I use

我用

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

The new text should look like

新文本应如下所示

NEW hello1 hello, Helloz

NEW hello1 你好，Helloz

PHP returns

PHP 返回

NEW hello1 hello, NEWz

NEW hello1 你好，NEWz

Thanks.

谢谢。

回答by Lethargy

You want to use regular expressions. The \bmatches a word boundary.

您想使用正则表达式。该\b单词边界匹配。

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

---

---

If $textcontains UTF-8 text, you'll have to add the Unicode modifier "u", so that non-latin characters are not misinterpreted as word boundaries:

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：

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

回答by sandeep kumar

multiple word in string replaced by this

字符串中的多个单词由此替换

    $String = 'Team Members are committed to delivering quality service for all buyers and sellers.';
    echo $String;
    echo "<br>";
    $String = preg_replace(array('/\bTeam\b/','/\bfor\b/','/\ball\b/'),array('Our','to','both'),$String);
    echo $String;
    Result: Our Members are committed to delivering quality service to both buyers and sellers.

回答by mario

Arrayreplacement list: In case your replacement strings are substituting each other, you need preg_replace_callback.

数组替换列表：如果替换字符串相互替换，则需要preg_replace_callback.

$pairs = ["one"=>"two", "two"=>"three", "three"=>"one"];

$r = preg_replace_callback(
    "/\w+/",                           # only match whole words
    function($m) use ($pairs) {
        if (isset($pairs[$m[0]])) {     # optional: strtolower
            return $pairs[$m[0]];      
        }
        else {
            return $m[0];              # keep unreplaced
        }
    },
    $source
);

Obviously / for efficiency /\w+/could be replaced with a key-list /\b(one|two|three)\b/i.

显然 / 为了效率/\w+/可以替换为 key-list /\b(one|two|three)\b/i。

回答by Danon

You can also use T-Regxlibrary, that quotes $or \characters while replacing

您还可以使用T-Regx库，在替换时引用$或\字符

<?php
$text = pattern('\bHello\b')->replace($text)->all()->with('NEW');