[英]PHP's in_array unexpected result
When I execute this small piece of PHP code: 当我执行这一小段PHP代码时:
php -r "echo(in_array(0, array('aaa', 'bbb')));"
That echoes true ... 这回事真实 ......
Of course I have the good return value if I add the strict flag to in_array
, but I just can't understand why it returns true (I can't !!). 当然,如果我将严格标志添加到in_array
,我有很好的返回值,但我只是无法理解为什么它返回true (我不能!!)。 If anyone can explain me I will sleep well tonight. 如果有人能解释我,今晚我会睡得好。
PS: Sorry that this is just about curiosity... PS:对不起,这只是好奇心......
That's because for PHP
this code will return true
那是因为对于PHP
这段代码将返回true
0 == 'aaa'
So without strict checking PHP
will find your value in given array. 所以没有严格的检查, PHP
会在给定的数组中找到你的值。
Also, check out this code: 另外,看看这段代码:
var_dump(0 == 'aaa');
var_dump(0 === 'aaa');
var_dump(in_array(0, array('aaa', 'bbb')));
var_dump(in_array(0, array('aaa', 'bbb'), true));
The last version allows strict type comparison so it will work as expected, that is return false. 最后一个版本允许严格的类型比较,因此它将按预期工作,即返回false。
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