PHP tag style when parsing a file, PHP will look for the start and end tags, that is This tells PHP to start and stop parsing the code between the two. This resolution method allows PHP to be embedded in a variety of different documents, and any part other than the start and end tags will be ignored by the PHP parser.
PHP can also use short Tags . The short tag can be used only when the short_open_tag configuration command in php. ini is activated or the configuration option -- enable-short-tags is used during PHP compilation.
If the file content is pure PHP code, it is best to delete the PHP end mark at the end of the file. This avoids accidental addition of spaces or line breaks after the PHP end mark, which may cause PHP to start to output these spaces, but the script does not have the intention to output at this time.
// Standard tags-Recommended
// Short tags, need short_open_tag enabled in php. ini
<%> // Asp tags, need asp_tags enabled in php. ini
