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php get variable name as a string

By Kind KoalaKind Koala on May 04, 2021
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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