concat utf-8 mysql

concat( convert(a  USING utf8), convert(b USING utf8 )

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register_shutdown_function php

For Fetal Error if you want to specify something different like if you want to send email with errors

register_shutdown_function(user_function)

function user_function(){

$error= error_get_last();
}


debug_backtrace()

java foreach and mathods argument with array

private static multplevalues(double ... values){



}

for(double d: values){



}


BIG DECIMAL for financial calculation