PHP expression

by

This is known as heredoc syntax. The documentation will tell you everything you need to know.

Essentially, however:

A third way to delimit strings is the heredoc syntax: <<<. After this operator, an identifier is provided, then a newline. The string itself follows, and then the same identifier again to close the quotation.

The closing identifier must begin in the first column of the line. Also, the identifier must follow the same naming rules as any other label in PHP: it must contain only alphanumeric characters and underscores, and must start with a non-digit character or underscore.

So EOB is just what the author chose as his delimiter, not really sure what it stands for in his case but the identifier can be whatever you want.

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