1 2 3 4 5
<?php var_dump( urlencode( '$a = 1 + 2 + 3 − 4 + 5;' ) ); var_dump( urlencode( '$a = 1 + 2 + 3 - 4 + 5;' ) ); // ^
1 2
string(43) "%24a+%3D+1+%2B+2+%2B+3+%E2%88%92+4+%2B+5%3B" string(35) "%24a+%3D+1+%2B+2+%2B+3+-+4+%2B+5%3B"