<?php $str = 'I Love You!'; $str = str_replace('o','O',$str,$count); echo $str.PHP_EOL; // I LOve YOu! echo '替换了'.$count.'个'.PHP_EOL; // 替换了2个 $str = 'I Love You!'; $str = str_replace(['o','u'],'O',$str,$count); echo $str.PHP_EOL; // I LOve YOO! echo…