Copy Code code as follows:
/**
* Get variable name
*
* @param $string
* @return $string
*
* $test = "Helo";
* $test 2 = "Helo";
* Getvarname ($test 2);
*/
Function Getvarname (& $SRC) {
Store current Variable Value
$save = $SRC;
Store all variable values
$allvar = $GLOBALS;
Do not traverse $globals in a function, there will be a stack problem
foreach ($allvar as $k => $v) {
Variable values are the same, may not be the same variable, because the values of multiple variables may be the same
if ($src = = $v) {
Change the value of the current variable $src
$SRC = ' Change ';
If the $globals[$k] then change, that is the same variable.
if ($src = = $GLOBALS [$k]) {
echo "\$ $k name is $k
";
Restore variable values
$SRC = $save;
return $k;
}
}
}
}
Copy down after found this how to test results sometimes wrong, think for a long time, finally understand, although very simple, but they are still recorded, hope to encounter the same situation students attention.
For example: Now I'm testing
Copy Code code as follows:
$test 2 = "Hello";
$countNum = 0;
Echo Getvarname ($test 2);
According to the principle should be output as "test2", but the output is "Countnum",
Because in the function of the
if ($src = = $v) There are problems such as $src= "Hello", $GLOBALS there is a variable $countnum=0;
At this time in the loop to determine if ($src = = $v), that is, "Hello" ==0, the result of the comparison is true, type conversion when "hello" to plastic to 0,
Then you exit the loop and get the wrong result.
One solution is if ($src = = $v) change to if ($src = = = $v), that is, identity.
If I understand you wrong, please correct me and make progress together.
