Function debug

Prints out debug information about given variable.

Only runs if debug level is greater than zero.

debug( mixed $var boolean|null $showHtml null boolean $showFrom true )

Parameters summary

mixed $var Variable to show debug information for.
boolean|null $showHtml = null If set to true, the method prints the debug data in a browser-friendly way.
boolean $showFrom = true If set to true, the method prints from where the function was called.

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http://api.cakephp.org/3.1/function-debug.html