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A 'catch' without a variable is a catch with the 'without_variable' flag set with a variable with an autogenerated name. This variable is further used as a placeholder. At the stage of code generation, if the 'without_variable' flag is set, then we simply destroy the current exception, thereby handling it. The gain in this case is in the absence of moving the current exception into a temp variable, which, according to benchmarks, however, gives an increase in speed within the margin of error for simple Exception.
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RFC: https://wiki.php.net/rfc/non-capturing_catches
A
catchwithout a variable is a catch with thewithout_variableflag set and with a variable with an autogenerated name. This variable
is further used as a placeholder.
At the stage of code generation, if the
without_variableflag is set,then we simply destroy the current exception, thereby handling it.
#290