Understanding Heredoc In PHP 2023

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Understanding Heredoc In PHP

PHP heredoc (short for "here document") is a way to specify a string literal in PHP that can span multiple lines. It is similar to a double-quoted string, but it is not surrounded by double quotes. Instead, it is introduced by a label (which can be any identifier) followed by a colon and an end of line, and it is terminated by the same label on a line by itself.

Here is an example of using a heredoc in PHP:

$html = <<<HTML
<html>
  <head>
    <title>My Page</title>
  </head>
  <body>
    <h1>Welcome to my page!</h1>
  </body>
</html>
HTML;

echo $html;

In this example, the label HTML is used to introduce and terminate the heredoc. The heredoc starts with <<<HTML and ends with HTML;. All of the text in between, including line breaks, is treated as a string literal.

One advantage of using a heredoc is that it allows you to specify a string literal that includes multiple lines without having to use escape sequences or concatenation. It is particularly useful for defining large blocks of text, such as HTML or SQL code.

However, it is important to note that heredocs are not interpreted as PHP code. Any variables or escape sequences within a heredoc will be treated as plain text, not as PHP code. If you need to include PHP code within a string literal, you can use a double-quoted string or a nowdoc instead.

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