slim-php is_callable () parameters in parentheses?

See Slim source of the time to find this usage

Official Handbook

Why it's so used, $route is an object, $setOutputBuffering is a method inside

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PS: And what is this advanced usage

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See Slim source of the time to find this usage

Official Handbook

Why it's so used, $route is an object, $setOutputBuffering is a method inside

================
PS: And what is this advanced usage

First, the [...] square brackets are php5.4 provided after an array of short-write syntax, in fact, and array(...) the effect is the same.

Second, callable there are many ways to represent an php executable method, callable and using an array to represent it is one of them. Here [$route, 'setOutputBuffering'] is the method that represents this $route object setOutputBuffering .

The final syntax is php in the HEREDOC syntax, in fact, is a multi-line string representation method.

[$route, 'setOutputBuffering']This is commonly used incall_user_func_array

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