Let's take a look at the new operators in PHP7

##NULL merge operator

is actually ternary Operator transformation, reduced code amount

//原先的做法
//$lig = isset($_GET['lig'])?$_GET['lig']:'bee';$lig = $_GET['lig']??'bee';echo $lig;

Spaceship operator (combination comparison operator)

The essence is a size comparison operator, but compared to '', the return value is -1 more. It has a similar function to Java's string comparison compareto()

<?phpecho 1<=>1.1;print (PHP_EOL);//换行符echo "<br>";print (1.1<=>1);echo "<br>";echo 1<=>&#39;1&#39;;

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