Heredoc ¶

A here document, which is commonly shortened to heredoc is a multiline string literal syntax supported by multiple programming languages such as Bash, PHP, Ruby, etc.

It usually starts with << followed by some DELIMITER. The string is closed when we reach the next occurrence of DELIMITER.

Bash example 🔥

base64 -d <<EOF
YWFhYQ==
EOF

PHP example 🔥

$some_variable = <<<EOF
We can use both ' and ".
EOF;