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Detailed explanation of output based on empty function_PHP tutorial
- WBOYOriginal
- 2016-07-21 15:05:40875browse
$a = '';
echo '1.---------------'.empty($a).'
';
$a = '0';
echo '2.---------------'.empty($a).'
';
$a = 0;
echo '3.---------------'.empty($a).'
';
$a = null;
echo '4.---------------'.empty($a).'
';
$a = 'null';
echo '5.---------------'.empty($a).'
';
$a = 'abc';
echo '6.---------------'.empty($a).'
';
$a = true;
echo '7.---------------'.empty($a).'
';
$a = 'true';
echo '8.---------------'.empty($a).'
';
$a = false;
echo '9.---------------'.empty($a).'
';
$a = 'false';
echo '10.---------------'.empty($a).'
';
$a = 1;
echo '11.---------------'.empty($a).'
';
$a = '1';
echo '12.---------------'.empty($a).'
';
$a = 'null';
echo '13.---------------'.!empty($a).'
';
结果：
1.---------------1
2.---------------1
3.---------------1
4.---------------1
5.---------------
6.---------------
7.---------------
8.---------------
9.---------------1
10.---------------
11.---------------
12.---------------
13.---------------1