例子
$string
=
'April 15, 2003'
;
$pattern
'/(\w+) (\d+), (\d+)/i'
$replacement
'${1}1,$3'
echo
preg_replace (
,
);
如果用preg_replace_callback 函数 改写为
preg_replace_callback(
function
(
$matches
){
return
[1].
','
.
[3];
} ,