效果参考(附源码)http://mail.htjs.net/yanzhengma/test.php
<?session_start();?>
<FORM METHOD=POST ACTION="">
<input type=text name=number maxlength=4><img src=http://www.webjx.com/htmldata/2005-03-04/"YanZhengMa.php?act=init">
<INPUT TYPE="submit" name="sub">
</FORM>
<?
//检验校验码
if(isset(["sub"])):
if(["number"] != [login_check_number] || empty(["number"])){
echo "校验码不正确!" ;
}else{
echo"验证码通过!";
}
endif;
show_source('test.php');
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