Question

here is myproblem, i want to make a php function to insert some random letter to specific word.

example :

random letter : a,i,u,e,o

specific word : monkey,deer,tiger,mouse

sentence : a tiger eating a deer, monkeys and rats see from a distance

I want the sentence to be like this:

a tiager eating a dueer, monkeiys and raats see from a distance

Answer 1

$sentence = 'a tiger eating a deer, monkeys and rats see from a distance'; // You'll need to load the string into a variable, obviously.

$randomLetterArray = array('a', 'e', 'i', 'o', 'u'); // It's good to set the random letters inside an array so that they can be randomly picked by randomizing the index number.

$specificWordArray = array('monkey', 'deer', 'tiger', 'mouse'); // Words to be altered in an array to easily iterate through.

foreach ($specificWordArray as $specificWord) // Iterating through each of the words to be altered.
{
    $indexOfWord = rand(0, strlen($specificWord)-1); // Getting a random number between 0 and the length (in chars) of the word.
    $partOfWord = substr($specificWord, 0 , $indexOfWord); // Getting a part of the word based on the random number created above.
    // This is more complex.
    // The part of the word created above is concatenated by a random selection of one of the random letters.
    // This in turn is concatenated by the remaining letters in the word.
    $wordReplacement = $partOfWord.$randomLetterArray[rand(0, count($randomLetterArray)-1)].substr($specificWord, $indexOfWord);
    $sentence = str_ireplace($specificWord, $wordReplacement, $sentence); // This replaces the word in the sentence with the new word.
}
echo $sentence;

I hope this gives you some ideas into how to approach the problem, and I hope the comments help to give an idea of the functions available to you in PHP.

Good luck!