php如何批量替换文本信息

$arr = array("blue","red","green","yellow");
print_r(str_replace("red","pink",$arr,$i));
echo "替换数：$i";

$find = array("Hello","world");
$replace = array("B","A");
$arr = array("Hello world","world","!");
$str = "Hello world danbus world";
print_r(str_replace($find,$replace,$arr));
print_r(str_replace($find,$replace,$str));
/**
Array
(
 [0] => B A
 [1] => A
 [2] => !
)
-------------------
B A danbus A
**/