PHP method to determine whether the data from the FORM form or URL parameter is an integer_php tips

PHP determines whether the data from the FORM form or URL parameter is an integer. The is_int function has no way to determine whether the data from the FORM form or URL parameter is an integer, because the data from the FORM is a string.
Use is_numeric to determine whether it is a numeric type, and then determine whether there is a decimal point to determine whether it is an integer

if(!is_numeric($page)||strpos($page,".")!==false){
echo "不是整数";
}else{
echo "是整数";
}

Sometimes we need a method to determine whether the id is a number:

How to judge numbers in dedecms

$cid = empty($cid)? 1 : intval(preg_replace("/[^-\d]+[^\d]/",'', $cid));

It is recommended that you filter the key parameters. Such as digital regular filtering

Copy code The code is as follows:

if(preg_match("/^d*$/",$fgid)) echo('is a number');
else echo('not a number');

Or use function

Copy code The code is as follows:

if(is_numeric($fgid)) echo('is a number');
else echo('not a number');