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php怎么判断是否在数组中存在

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Release： 2016-06-13 12:56:37
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php如何判断是否在数组中存在
有一个数组：
array
(
[0] =>a
[1] =>b
[2] =>c
[3] =>d
)
我想做一个判断，比如判断一个已知字符串a是否存在于这个数组中，如果存在就执行一条语句。


------解决方案--------------------
in_array()
------解决方案--------------------
引用:
引用:in_array($a, $array)
如果写成IF语句，那是怎样写，是
if(in_array($a, $array)==true)
{

}
吗？

in_array返回bool值
if(in_array($a, $array)){<br />
}
Copy after login


唉，老毛病又犯了！！！

------解决方案--------------------
引用:
引用:in_array($a, $array)
如果写成IF语句，那是怎样写，是
if(in_array($a, $array)==true)
{

}
吗？


你的写法不是最佳写法。

测试存在这样写：
if(in_array($a, $array))<br />
{<br />
<br />
}
Copy after login


测试不存在这样写：
if(!in_array($a, $array))<br />
{<br />
<br />
}
Copy after login
Related labels：
array if in nbsp true
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