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PHP判断FORM表单或URL参数来的数据是否为整数的方法_php技巧

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Release： 2016-05-16 19:55:43
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PHP判断FORM表单或URL参数来的数据是否为整数，is_int函数对于FORM表单或URL参数过来的数据是没有办法判断是否是整数的，因为FORM过来的是字符串。
用is_numeric可以判断是否为数字类型，再判断是否有小数点就可以判断是不是整数了

if(!is_numeric($page)||strpos($page,".")!==false){
echo "不是整数";
}else{
echo "是整数";
}
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有时候我们需要判断id是否为数字的方法：

dedecms中的判断数字的方法

$cid = empty($cid)? 1 : intval(preg_replace("/[^-\d]+[^\d]/",'', $cid));
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建议大家对关键的参数必须做过滤。如数字正则过滤

复制代码 代码如下:

if(preg_match("/^\d*$/",$fgid))    echo('是数字');
else   echo('不是数字');

或者用函数
复制代码 代码如下:

if(is_numeric($fgid)) echo('是数字');
else echo('不是数字');
Related labels：
php integer
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