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网上下载了html2pdf-4.5.1.zip，
要运行里面的实例，要先安装composer
运行html2pdf时，readme里面建议按照composer-setup.exe
安装过程中出现openssl的问题，在php.ini中开启相应extension即可，
路径写绝对路径，否则按默认路径找不到
在html2pdf的文件路径下，cmd运行composer install
安装dependencies
D:\software\WebServer\apache\Apache24\htdocs\html2pdf>composer install
Loading composer repositories with package information
Updating dependencies (including require-dev)
- Installing tecnickcom/tcpdf (6.2.12)
Downloading: 100%
Writing lock file
Generating autoload files
D:\software\WebServer\apache\Apache24\htdocs\html2pdf>
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下载的文件目录概览
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运行时出现的问题
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修改以上gd extension问题，修改php.ini
extension=D:\software\PhpWin\php56\ext\php_gd2.dll ;extension=php_gettext.dll ;extension=php_gmp.dll ;extension=php_intl.dll ;extension=php_imap.dll ;extension=php_interbase.dll ;extension=php_ldap.dll ;extension=php_mbstring.dll ;extension=php_exif.dll ; Must be after mbstring as it depends on it ;extension=php_mysql.dll ;extension=php_mysqli.dll ;extension=php_oci8_12c.dll ; Use with Oracle Database 12c Instant Client extension=D:\software\PhpWin\php56\ext\php_openssl.dll //这是安装composer时出现错误要改的
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至此，运行成功
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