在数组中存储变量名

Question

So I have a List of Variables

$TestData1="Hello";
$TestData2="";
$TestData3="0";
$TestData4="Yes";
$TestData5=" ";
$TestData6="No";

I want to make a function that will run all these variables through a filter. I want to make this a loop that checks all the variables in one shot. I had the idea of storing the variable names in an array. This is shown below.

$TestArray=array("TestData1", "TestData2", "TestData3", "TestData4","TestData5","TestData6");

So my main question is how would I take these names in the array and run a loop that checks to see if a certain condition is met. Example below.

foreach ($TestArray as $Data):

   $VariableToTestConnditions="$".$Data;



endforeach;

I know that statement doesn't work, but it is all I could think of. The out come of this would be if the variable value =="Yes" then is would change the original variable's value to "N/A". So after it checks all the variables, it would change $TestData4 to "N/A".

Answer 1

instead of having an array of the names, it would make more sense to have an associative array (key value pairs):

$TestArray = array(
    "TestData1" => "Hello",
    "TestData2" => "",
    "TestData3" => "0",
    "TestData4" => "Yes",
    "TestData5" => " ",
    "TestData6" => "No"
);

now if you wanted to test a variable:

foreach($TestArray as $key => $value) {
    if($VariableToTestConnditions == $value) {
        //do something 
    }
}

if you wanted to change the value of a testdata:

$TestArray["TestData1"] = "Good Bye";

this way is much neater and simpler.

Answer 2

i used echo to demo the syntax, you can use what you like

$TestData1="Hello";
$TestData2="";
$TestData3="0";
$TestData4="Yes";
$TestData5=" ";
$TestData6="No";

$TestArray=array("TestData1", "TestData2", "TestData3", "TestData4","TestData5","TestData6");


foreach($TestArray as $a){

echo ${$a};
 //or 
echo $$a;

}

Answer 3

Use the two-dollar sign.

See PHP variable variables: http://php.net/manual/en/language.variables.variable.php

foreach ($TestArray as $Data):

   $VariableToTestConnditions=$$Data;

endforeach;