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php get variable name as a string
function print_var_name(){
// read backtrace
$bt = debug_backtrace();
// read file
$file = file($bt[0]['file']);
// select exact print_var_name($varname) line
$src = $file[$bt[0]['line']-1];
// search pattern
$pat = '#(.*)'.__FUNCTION__.' *?\( *?(.*) *?\)(.*)#i';
// extract $varname from match no 2
$var = preg_replace($pat, '$2', $src);
// print to browser
echo trim($var);
}
Source: stackoverflow.com
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