SGML/XML処理命令, PHP short_open_tag on / off
SGML
処理指令 = pio, システムデータ, pic ―(44) システムデータ = 文字データ ―(45)SGMLsec7_0.html, Latest updated 1998.01.19
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"> <title></title><p></p> <? /* php code */ ?>
XML
[16] PI ::= '<?' PITarget (S (Char* - (Char* '?>' Char*)))? '?>' [17] PITarget ::= Name - (('X' | 'x') ('M' | 'm') ('L' | 'l'))Extensible Markup Language (XML) 1.0 (Fifth Edition)
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><title></title></head><body><p></p> <?php /* php code */ ?> </body></html>