thinkphp 判断一个字符串是纯数字？
<eqname=”name”value=”value”>value</eq>name的值有123，abc，234，sdc...
<eq name=”name” value=”value”>value</eq> name的值有123，abc，234，sdc
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用is_numeric判断
php官方的例子
<?php
$d = @$_GET['d'];
/*
assuming that passing value of d in the mysql
$sql = "select * from books where bookid = '$d' "
*/
/*
now check if $d is numeric?
*/
if(!is_numeric($d)){
$d = preg_replace("/[^0-9]+/", "", $d);
}
echo "Cleared value: $d \n<br />Original Vlaue:".@$_GET['d'];
//then using clear value of $d in the mysql query
$sql = "select * from books where bookid = '$d' ";
?>
php官方的例子
<?php
$d = @$_GET['d'];
/*
assuming that passing value of d in the mysql
$sql = "select * from books where bookid = '$d' "
*/
/*
now check if $d is numeric?
*/
if(!is_numeric($d)){
$d = preg_replace("/[^0-9]+/", "", $d);
}
echo "Cleared value: $d \n<br />Original Vlaue:".@$_GET['d'];
//then using clear value of $d in the mysql query
$sql = "select * from books where bookid = '$d' ";
?>
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