地图初始化和增量在一个声明中

Question

我怎样才能增加，某行的映射条目，请参见下面评论：

$results = array(); 

# ... compute $results 

# I would like to replace below with one statement, is it possible? 
if (!array_key_exists("cnt", $results)) { 
    $results["cnt"] = 1; # first time 
} else { 
    $results["cnt"] += 1; 
} 

Answer 1

<?php 
    $results["cnt"] = !array_key_exists("cnt", $results) ? 1 : $results["cnt"] + 1;