Introducing-PHP5.4

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$str = 'php,5.4';
$arr = explode(',', $str)[1]; //echo php
function dosomething(){
        return [
            'hello' => 'hello world'
        ];
}
/**
 * 支持短语法 <?= 'xx'?> 相当于<?php echo 'xxx'?>
 */
dosomething()['hello'];
//echo hello world
/**
 * 更加准确的处理时间
 */
//<5.4
$startTime = microtime(1);
//代码块
echo '花费了'.(microtime(1)-$startTime);
//>5.4
echo '花费了'.(microtime(1)-$_SERVER["REQUEST_TIME_FLOAT"]);
/**
 * TRAIT 实现继承/重复利用
 */
trait name {
        public function name($name){
                return $name;
        }
}
trait age{
        public function age($age){
                return $age;
        }
}
class people{
        use name;
        use age;
        public function peopleInfo(){
                return 'this people name is '.$this->name('hello').'age'.$this->age(19);
        }
}
$obj = new people();
var_dump($obj->peopleInfo());