php in_array()函数使用注意事项

<?php
$nameslist = array("小皮皮", "小轩轩", "工了以", "可爱的小贸");

if (in_array("工了以",$nameslist))
  {
  echo "找到呀";
  }
else
  {
  echo "不知道在哪里找，找不到";
  }
?>

<?php
$value='';
$falsehortrue=in_array($value,array(0,1));
var_dump($falsehortrue);
//bool(true)
?>

<?php
$value='';
$falsehortrue=in_array($value,array(0,1),true);
var_dump($falsehortrue);
// bool(false)
?>