What is meant by a number after "break" or "continue" in PHP?

What is meant by a number after "break" or "continue" in PHP?

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PHPStorm Xdebug always breaks on first line

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PHP Debugging with Breakpoints - case studies, examples..?

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PHP Debugger will not stop at breakpoints: Eclipse & Xdebug

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XDebug does not break on breakpoints from atom's php-debug package

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