Question

我有一个php文件，其中的代码如下：

def numpy_ema(data, com=None, span=None, halflife=None, alpha=None):
"""Summary
Calculate ema with automatically-generated alpha. Weight of past effect
decreases as the length of window increasing.

# these functions reproduce the pandas result when the flag adjust=False is set.
References:
https://stackoverflow.com/questions/42869495/numpy-version-of-exponential-weighted-moving-average-equivalent-to-pandas-ewm

Args:
    data (TYPE): Description
    com (float, optional): Specify decay in terms of center of mass, alpha=1/(1+com), for com>=0
    span (float, optional): Specify decay in terms of span, alpha=2/(span+1), for span>=1
    halflife (float, optional): Specify decay in terms of half-life, alpha=1-exp(log(0.5)/halflife), for halflife>0
    alpha (float, optional): Specify smoothing factor alpha directly, 0<alpha<=1

Returns:
    TYPE: Description

Raises:
    ValueError: Description
"""
n_input = sum(map(bool, [com, span, halflife, alpha]))
if n_input != 1:
    raise ValueError(
        'com, span, halflife, and alpha are mutually exclusive')

nrow = data.shape[0]
if np.isnan(data).any() or (nrow > 13835) or (data.ndim == 2):
    df = pd.DataFrame(data)
    df_ewm = df.ewm(com=com, span=span, halflife=halflife,
                    alpha=alpha, adjust=False)
    out = df_ewm.mean().values.squeeze()
else:
    if com:
        alpha = 1 / (1 + com)
    elif span:
        alpha = 2 / (span + 1.0)
    elif halflife:
        alpha = 1 - np.exp(np.log(0.5) / halflife)

    alpha_rev = 1 - alpha
    pows = alpha_rev**(np.arange(nrow + 1))

    scale_arr = 1 / pows[:-1]
    offset = data[0] * pows[1:]
    pw0 = alpha * alpha_rev**(nrow - 1)

    mult = data * pw0 * scale_arr

    cumsums = np.cumsum(mult)
    out = offset + cumsums * scale_arr[::-1]
return out

如果我单击提交，为什么<?php if (isset($_GET['action']) && $_GET['action'] == 'view') { echo "get"; print_r($_GET); } else { } ?> <html> <form method="get" action="<?php echo ($_SERVER['PHP_SELF'] . '?action=view&id=4') ; ?>"> <input type="text" /> <input type="submit" /> </form> </html>和echo "post";不输出到屏幕上？

EDIT01

我将代码更改为以下代码：

print_r($_POST);

但是，它没有经过<?php if (isset($_GET['action']) && $_GET['action'] == 'view') { echo "if "; var_dump($_GET); } else { echo "else "; var_dump($_GET) ; } ?> <html> <form method="get" action="?action=view&id=4"> <input type="text" name="username" /> <input type="submit" /> </form> </html>，而是经过if。

屏幕输出如下：

Answer 1

Take a look at this code $_GET['action']. This code will seek the tag with name=action. Since there is no tag with name=action, your code will enter else instead of if.

To solve this, fix your input submit tag into this.

<input type="submit" name="action" />

提交表单，但不执行php代码

1 个答案: