PHP string replace match whole word

user_450504 0
Viewed 59872

I would like to replace just complete words using php

Example : If I have 

$text = "Hello hellol hello, Helloz";

and I use

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

The new text should look like

NEW hello1 hello, Helloz

PHP returns

NEW hello1 hello, NEWz

Thanks.

str-replace replace php string
4 Answers

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

user_3450310

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

<?php
$text = pattern('\bHello\b')->replace($text)->all()->with('NEW');
user_34290150
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