Check if key exists in $_SESSION by building index string
- by Kim
I need to check if a key exists and return its value if it does.
Key can be an array with subkeys or endkey with a value.
$_SESSION['mainKey']['testkey'] = 'value';
var_dump(doesKeyExist('testkey'));
function doesKeyExist($where) {
$parts = explode('/',$where);
$str = '';
for($i = 0,$len = count($parts);$i<$len;$i++) {
$str .= '[\''. $parts[$i] .'\']';
}
$keycheck = '$_SESSION[\'mainKey\']' . $str;
if (isset(${$keycheck})) {
return ${$keycheck};
}
// isset($keycheck) = true, as its non-empty. actual content is not checked
// isset(${$keycheck}) = false, but should be true. ${$var} forces a evaluate content
// isset($_SESSION['mainKey']['testkey']) = true
}
What am I doing wrong ?
Using PHP 5.3.3.
