How do I extract specific variables from a string?
let's say I have the following:
$vars="name=david&age=26&sport=soccer&birth=1984";
I want to turn this into real php variables, but not all. For example, the functions I need are:
$thename=getvar($vars,"name");
$theage=getvar($vars,"age");
$newvars=cleanup($vars,"name,age"); // Output $vars="name=david&age=26"
How can I only get the variables I need. And how can I clear $ vars of other variables if possible?
thanks
+2
a source to share
2 answers
You can do something like:
function getvar($arr,$key) {
// explode on &.
$temp1 = explode('&',$arr);
// iterate over each piece.
foreach($temp1 as $k => $v) {
// expolde again on =.
$temp2 = explode('=',$v);
// if you find key on LHS of = return wats on RHS.
if($temp2[0] == $key)
return $temp2[1];
}
// key not found..return empty string.
return '';
}
and
function cleanup($arr,$keys) {
// split the keys string on comma.
$key_arr = explode(',',$keys);
// initilize the new array.
$newarray = array();
// for each key..call getvar function.
foreach($key_arr as $key) {
$newarray[] = $key.'='.getvar($arr,$key);
}
// join with & and return.
return implode('&',$newarray);
}
+3
a source to share
I would use parse_str()
and then manipulate the array.
$vars="name=david&age=26&sport=soccer&birth=1984";
parse_str($vars, $varray);
$thename = $varray["name"];
$theage = $varray["age"];
$newvars = array_intersect_key($varray,
array_flip(explode(",","name,age")));
+8
a source to share