php - $pId == 0 && $s ? eval("\$n = \"$s1\";") : eval("\$n = \"$s\";")

Question

$parentId == 0 && $str_group ? eval("$nstr = \"$str_group\";") : eval("$nstr = \"$str\";");

Was bedeutet == in dieser Codezeile?

Answer 1

三元运算符，等价于

if($parentId == 0 && $str) {
    eval("\$nstr = \"$str\";");
} else {
    eval("\$nstr = \"$str\";");
}