在没有正则表达式的给定位置后替换字符串中的所有匹

Question

I have a string abcxdefxghix. I wish to remove all "x"s except the first one. I can easily find the position of the first "x" using strpos(), so wish to remove all "x"s after that position. str_replace() performs a replacement of a given string with another, but doesn't allow a start position. substr_replace() gives a start position, but doesn't have the search parameter. I realize this can be done using preg_replace() but it seems like it should also be possible with without regular expressions (or without some crazy split/replace/assemble strategy).

Answer 1

I 'd most likely do it the old-fashioned way:

$index = strpos($input, $needle);
if ($index !== false) {
    $input = substr($input, 0, $index + 1).
             str_replace($needle, $replacement, substr($input, $index + 1));
}