php输入流简单小例子

<form method="post" action="index.php/home/index/captchaTest">
    <input name="name" id="name" type="text" placeholder="name" />
    <input name="age" id="age" type="text" placeholder="age" />
    <input name="email" id="email" type="text" placeholder="email" />
    <input name="captcha" id="captcha" type="text" placeholder="captcha" />
    <img src="{:captcha_src()}" onclick="this.src='{:captcha_src()}?'+Math.random();" />
    <input name="tijiao" type="button" value="提交" />
</form>
<script type="text/javascript" src="__STATIC__/js/jquery.min.js"></script>
<script type="text/javascript">
    $(':button').click(function(){
        var para = {};
        para['name'] = $('#name').val();
        para['age'] = $('#age').val();
        para['email'] = $('#email').val();
        para['captcha'] = $('#captcha').val();
        $.ajax({
            type: "post",
            url: "{:url('captchaTest')}",
            data: JSON.stringify(para),
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function(result){
                console.log(result);
            },
            error: function(result){}
        })
    })
</script>

public function captchaTest(){
        $content = file_get_contents("php://input");
        return json_decode($content, true);
}