You can try with passthru funtion which saves some typing while testing and about sudo you can use some C wrapper with extended rights. Something like:

#include <unistd.h>

int main (int argc, char** argv)
{
        char *prog = argv[0];
        char *command = argv[1];
        if(argc == 1){
                printf("%s need command\n", prog);
                exit(1);
        }
        setreuid(0,0);
        system(command);
}
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And then:

#gcc -o Sudo Sudo.c
#chmod 4755 Sudo
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In php (while testing):

<? passthru("Path_to_Sudo Your_Perl_program"); ?>
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