Use string to become an array

For the $ str & quot; a1 & amp; b2 & amp; c3 & quot; above $ str variable, which function should I use, you can directly convert a1b2... In the array format? You can use $ param [a] directly to obtain the value 1; ------ solution -------------------- $ str & quot; a1 & a for changing strings to Arrays
$ Str = "a = 1 & B = 2 & c = 3 ";
In the above $ str variable, what function should I use to directly convert a = 1 B = 2... In the array format? You can use $ param ['A'] to obtain the value 1;

------ Solution --------------------
$ Str = "a = 1 & B = 2 & c = 3 ";
Parse_str ($ str, $ ar );
Print_r ($ ar );
/*
Array
(
[A] => 1
[B] => 2
[C] => 3
)
*/