在字符串php中搜索字母组合

Question

i am trying to write a program in php that looks for "au" letter combinations within a string, if found, it should echo "1" if not echo "2". My problem is on my if condition. Any ideas?

<?php 

$word = "csa";
$b = str_split($word);
$length = count($word);
for ($i = 0; $i< $length; $i++) {
   if ($b[$i] = "a" & $b[$i+1] = "u")
      echo "1";
   else
      echo "2";
}

?>

Answer 1

you actually should do like thos

if (strpos($word,'au') !== false) {
      echo '1';
 } else {
      echo '2';
}