我试了所有我能找到的方法，比如这里的说明How to get CURL to work with PHP on Windows? (WAMP)
复制dll文件从php7.2.0文件夹到apache2.4.18\ bin文件夹
我的设置

win 10 64
wamp 3.1.1 
php, 5.6.28, 7.0.4, 7.2
apache 2.4.18

curl可以在任何其他php版本上运行，但不能在7.2上运行
已检查extension_dir路径，它指向右目录

extension_dir ="T:/wamp64/bin/php/php7.2.0/ext/"

已加载php 7.2扩展

extension=bz2
extension=curl
;extension=dba
extension=com_dotnet
;extension=enchant
extension=fileinfo
;extension=ftp
extension=gd2
extension=gettext
extension=gmp
extension=intl
extension=imap
;extension=interbase
extension=ldap
extension=mbstring
extension=exif      ; Must be after mbstring as it depends on it
extension=mysqli
;extension=odbc
extension=openssl
;extension=pdo_firebird
extension=pdo_mysql
;extension=pdo_oci
;extension=oci8_12c  ; Use with Oracle Database 12c Instant Client
;extension=pdo_odbc
;extension=pdo_pgsql
extension=pdo_sqlite
;extension=pgsql
;extension=phpdbg_webhelper
;extension=shmop

现在我看到在7.0.4中有php_前缀和dll后缀

extension=php_curl.dll

但这是在7.2信息中

; When the extension library to load is not located in the default extension
; directory, You may specify an absolute path to the library file:
;
;   extension=/path/to/extension/mysqli.so
;
; Note : The syntax used in previous PHP versions ('extension=<ext>.so' and
; 'extension='php_<ext>.dll') is supported for legacy reasons and may be
; deprecated in a future PHP major version. So, when it is possible, please
; move to the new ('extension=<ext>) syntax.
;
; Notes for Windows environments :
;
; - ODBC support is built in, so no dll is needed for it.
; - Many DLL files are located in the extensions/ (PHP 4) or ext/ (PHP 5+)
; extension folders as well as the separate PECL DLL download (PHP 5+).
; Be sure to appropriately set the extension_dir directive.

其他人也遇到了同样的问题，但没有解决方案。