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PHP Heredoc
Summary: in this tutorial, you’ll learn how to use PHP heredoc and nowdoc strings to improve the readability of the code.
Introduction to the PHP heredoc string
When you place variables in a double-quoted string, PHP will expand the variable names. If a string contains the double quotes (“), you need to escape them using the backslash character(\).

PHP heredoc strings behave like double-quoted strings, without the double-quotes. It means that they don’t need to escape quotes and expand variables.

PHP provides two alternatives for declaring single or double quoted strings in the form of heredoc and newdoc syntax.
The single quoted string doesn’t interpret the escape characters and doesn’t expand the variables.
On the other hand, if you declare a double quoted string that contains a double quote character itself, you need to escape it by the "\" symbol. The heredoc syntax provides a convenient method.

Heredoc Strings in PHP
The heredoc strings in PHP are much like double-quoted strings, without the double-quotes. It means that they don’t need to escape quotes and expand variables.