Comparison of Heredoc and Nowdoc in PHP

The difference between the two is the same as the PHP double and single quotation marks, the double quotation marks will parse the variables inside, and the single quotation marks will not

Heredoc syntax

<? PHP $a = ' cqh '; $str = <<<htmlhello,$aHTML; Echo $str;

Or

<? PHP $a = ' cqh '; $str = <<< "html"Hello,$ahtml; Echo $str;

Output

Hello,cqh

That is, the Heredoc syntax is <<< after the identifier without quotation marks/double quotation marks

Nowdoc syntax

<? PHP $a = ' cqh '; $str = <<< ' html 'Hello,$ahtml; Echo $str;

Output

Hello, $a

Comparison of Heredoc and Nowdoc in PHP