帮我看看用什么函数可以实行下面的结果

WBOY
Release: 2016-06-23 13:51:00
Original
1026 people have browsed it

我要实行的效果是两个字段,判断第一个字段是不是属于第二个字段里
比如
$a="2";
$b=“1,2,6,7,13”;

判断 $b包含$a



再比如
$a="3";
$b=“1,2,6,7,13”;

判断出结果  $b不包含$a


回复讨论(解决方案)

简单点就(但不严密)
echo strpos($b, $a) !== false ? '在' : '不在';

严密点就
echo in_array($a, explode(',', $b)) ? '在' : '不在';

因提到“字段”,可能是在 mysql 中
find_in_set(a, b)

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