php get variable by string name
${$variableName} or $$variableName;
//example:
$variableName = 'foo';
$foo = 'bar';
// The following are all equivalent, and all output "bar":
echo $foo;
echo ${$variableName};
echo $$variableName;php get variable by string name
${$variableName} or $$variableName;
//example:
$variableName = 'foo';
$foo = 'bar';
// The following are all equivalent, and all output "bar":
echo $foo;
echo ${$variableName};
echo $$variableName;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);
}Copyright © 2021 Codeinu
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