php - Logical operations between strings -

suppose have strings, how should transform them in order able use logical operations on them in php? possible?

example: want

"x=1"&&"x=0" 

to return false.

introduction

i noticed have both logical operator && , assignment operator in string = , want evaluate assignment has logical operator in string. don't know how got here very wrong education purpose tag along

breakdown

"x=1"  &&  "x=0" = false    ^    ^     ^   |    |     |         |     | x == 1 |     |        |     |       ,    |              |            x == 0 

the above expression false because x can not equal 0 , 1 @ same time

to able have such evaluation in php need write own function eg logicalstring can evaluate expression logicalstring("x=1") or logicalstring("x=0")

assumption

$x = 1; // imagine value of x  

example 1 &&

// start evaluation && if (logicalstring("x=1") && logicalstring("x=0")) {     echo "&& - true\n"; } else {     echo "&& - false\n"; } 

output 1

&& - false  

example 2 - ||

// start evaluation || if (logicalstring("x=1") || logicalstring("x=0")) {     echo "|| - true\n"; } else {     echo "|| - false\n"; } 

output 2

|| - true 

function used ( not used in production see why )

function logicalstring($str) {     parse_str($str, $v);     foreach ( $v $k => $var ) {         if (! isset($globals[$k]) || $globals[$k] != $var)             return false;     }     return true; } 

see online demo on php 4.3.0 - 5.5.0alpha3