Precautions for using delimiters <<<
Delimiter identification must be consistent
You can define the delimiter identifier arbitrarily, such as the echo HTML Div, use meaningful identifiers as much as possible, and follow some kind of naming conventions.
After the beginning of the logo can not be followed by any characters, spaces can not be wrapped, followed by the text to be output.
End identification (followed by a semicolon;) must not have any characters, that is, the end of the identity to write the head, and the exclusive line, and thereafter, in addition to the next minute, can not have any characters (space also can not)
Finally, it should be noted that the end of the identity row cannot be the last line of the script, there must be a blank line or other lines of code, otherwise error.
Examples are as follows:
<? php
//format one $a =<<<html <table><tr>123<td></td><td></td><td></td></tr ></table>html; echo $a //Format two echo <<<eot; echo ' 999999 ';//This line is the last additional statement to satisfy the note
The use of PHP delimiters is both a matter of note