This function will resolve objects to their class name, resources to their resource type name, and scalar values to their common name as would be used in type ...

Returns the type of the PHP variable value . For type checking, use is_* functions. Parameters ¶. value. The variable being type checked.

PHP Manual ¶ · Basic syntax · Types · Variables · Constants · Expressions · Operators · Control Structures · Functions ...

PHP Manual - Manual · Language Reference · Function Reference · Hiding PHP

For me, just outputting variables only works when I know a method should be broken. I use Xdebug in PHP Storm (available on other IDE's and editors as well)

// useful and comfortable debug function // it's show memory usage and time flow between calls, so we can quickly find a block of code that need optimisation...

image_type_to_extension - Get file extension for image type ... SolrClient::getDebug - Returns the debug data for the last connection attempt ... Other PHP.net ...

Function Reference ¶ · Arrays · Classes/Objects — Class/Object Information · Ctype — Character type checking · Filter — Data Filtering · Function Handling · Quickhash ...

debug_print_backtrace() prints a PHP backtrace. It prints the function calls, included/required files and eval()ed stuff. Parameters ¶. options.