Is_numeric

Is_numeric (PHP4 >= 4.0rc1) is_numeric---&http://www.aliyun.com/zixun/aggregation/37954.html ">nbsp; String syntax for determining whether a variable is numeric or numeric: int is_numeric (mixed var) description: If the parameter var is a numeric or numeric string returns True, otherwise ...

PHP in_array,trim,isset,unset,is_numeric function usage. Let's take a look at the tutorial on how to use these functions. In_array ($array) This function is to determine whether the current value is an array oh EX: $array = array (1,2); if (In_array ($array)) {die (' In_array determines that it is an array '); ...

$id =isset ($_get[' id ')? $_get[' id ']: '; if (!is_numeric ($id)) {exit ("<script>alert) (' Sorry, the user you accessed is not saved! '); History.back ();</script> "); }else{$sql = "SELECT * From ...

PHP Tutorial Anti-Injection code method filters all Get POST/* Filter all get over variable/foreach ($_get as $get _key=> $get _var) {if (Is_numeric ($get _var)) {$get [ Strtolower ($get _key)] = Get_int ($get _var); else {$get [Strtolower ($ge ...