浅谈PHP中其他类型转化为Bool类型_php技巧

WBOY
Release: 2016-05-16 19:55:44
Original
978 people have browsed it

问题起由:PHP中if(true==2)会返回true还是false?

结果是返回true,顺着这个问题,我把php其他数据类型也测试一下。

结论:

转化为bool类型时,会变成false的几种数据:

1.整型0

2.空字符串

3.空数组

4.NULL

欢迎补充...

测试代码:

<?php
function p($title,$mybool){
  echo "
".$title;
  echo var_dump($mybool)."
Copy after login
"; } class foo { function do_foo() { echo "你好!"; } } echo"
PHP中的其他类型转化为Bool类型
Copy after login
"; //零 $n0=boolval(0); p("零:",$n0); //正整数 $n=boolval(2); p("正整数:",$n); //负整数 $nx=boolval(-2); p("负整数:",$nx); //字符空格 $ss=boolval(" "); p("字符空格:",$ss); //空字符串 $sn=boolval(""); p("空字符串:",$sn); //字符串 $s=boolval("chinacion"); p("字符串:",$s); //空数组 $an=boolval(array()); p("空数组:",$an); //数组 $a=boolval(array(0=>1)); p("数组:",$a); //null类型 $nu = boolval(NULL); p("NULL:",$nu); //object $bar = new foo; $bar; $obj = boolval($bar); p("Object:",$obj);

Related labels:
php
source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact [email protected]
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template
About us Disclaimer Sitemap
php.cn:Public welfare online PHP training,Help PHP learners grow quickly!