replace random words in a string

问题

I want to create a function that replaces random words in a string. Here is what I thought of.

1. Given a string I would give a random index position within that string.
2. From that index I will replace the nearest word with a word that I want
3. Along with that I would store the word I just replace into some storage variable/database/file

Ex.

Random word seed: tree, cat, wolf, apple

String: The quick brown fox jumps over the lazy dog.

Possible Results:

1. The apple brown fox jumps cat the lazy dog.
2. The quick brown wolf tree over the lazy dog.
3. The quick tree fox tree over the lazy apple.

回答1:

The clearest code would be had by

1. Splitting the string into an array words (e.g. with explode or preg_split for more heavy-duty logic)
2. Replacing randomly selected entries in the array as you see fit
3. Joining the words back into a string with (e.g. implode)

回答2:

Simply explode the string on spaces, and use a rand() to replace. Like:

<?php
$string = "The quick brown fox jumps over the lazy dog.";
$aWords = explode($string, " ");
foreach ($aWords as $word)
{
    if(rand(1,2) == 1)
    {
        //replace the word
    }
}
// implode the string
?>

来源：https://stackoverflow.com/questions/10447943/replace-random-words-in-a-string