Question

I have a string that contains a series of random words separated by commas:

worda,sample,wordb,another,extra,exampleb

This list will always be different.

What is the most efficient way to replace the last vowel of each word with a given $variable?

Answer 1

This may give you some ideas…

    $replacement = '*';
    $string = 'super,cali,fragil,istic,expi,alido,cious';
    echo $string.'<br />';

    $vowels = array('a', 'e', 'i', 'o', 'u');
    $words = explode(',', $string);

    foreach($words as $word_key => $word)
    {
        $word = strrev($word);
        $chars = str_split($word);

        foreach($chars as $char_key => $char)
        {
            if(in_array($char, $vowels))
            {
                $word[$char_key] = $replacement;
                $words[$word_key] = strrev($word);
                continue(2);
            }
        }
    }

    $new_str = implode(',', $words);
    echo $new_str;die;

edited to use isset() instead of in_array()…

    $replacement = '*';
    $string = 'super,cali,fragil,istic,expi,alido,cious';
    echo $string.'<br />';

    $vowels = array(
        'a' => 1,
        'e' => 1,
        'i' => 1,
        'o' => 1,
        'u' => 1
    );

    $words = explode(',', $string);

    foreach($words as $word_key => $word)
    {
        $word = strrev($word);
        $chars = str_split($word);

        foreach($chars as $char_key => $char)
        {
            if(isset($vowels[$char]))
            {
                $word[$char_key] = $replacement;
                $words[$word_key] = strrev($word);
                continue(2);
            }
        }
    }

    $new_str = implode(',', $words);
    echo $new_str;die;