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$s = '@php的萨芬php的萨芬php的萨芬php的萨芬php的萨芬php';
$arr = array();
$index = 0;
$code = 97;
while(($i = mb_strpos($s, 'php', $index)) > 0){
$h = mb_substr($s, 0, $i);
$f = mb_substr($s, $i + 3);
$s = $h . chr($code) . $f;
$index = $i + 1;
$code++;
}
echo $s;