Php evaluate a string as variable and extract value of it

Question

<?php        
     $i=2;
     $teststring='$_SESSION["REGISTERED"]["FirstName'.$i.'"]';      
     var_dump($teststring); 
     die; 
     if(isset(($teststring))){
         //do something 
     }
?>

In above code I want find the value of $_SESSION["REGISTERED"]["FirstName2'] variable , I need suggestion/trick

Marc B · Accepted Answer · 2016-09-22 14:10:48Z

2

Why not just

$foo = $_SESSION['REGISTERED']["FirstName$i"];

Array keys are just strings, and they CAN be dynamically generated. There is absolutely no difference in PHP between these two:

$foo = array('bar' => 'baz');
$x = 'bar';

echo $foo[$x];
echo $foo['bar'];

both will output baz.

answered Sep 22, 2016 at 14:10

Marc B

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1 Comment

Shridhar U Patil Over a year ago

bro , I already spend a day on this but you saved my other day now , thank you very much, this is working as u said

HZS · Accepted Answer · 2016-09-22 14:13:41Z

0

you don't need extra quote for FirstName:

$teststring=$_SESSION["REGISTERED"]["FirstName".$i];

will simply work.

answered Sep 22, 2016 at 14:13

HZS

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