PHP commonly used small functions

This article shares with you several commonly used small functions in PHP. Friends who are interested can take a look, and friends in need can also refer to it

1. Get whether the website is http or https?

$http_type = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') || (isset($_SERVER['HTTP_X_FORWARDED_PROTO']) && $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')) ? 'https://' : 'http://';

2. Delete the empty data in the array,

function where_data($data)
{
    foreach ($data as $k => $v) {
        if (empty($v) && $v !='0') {
            unset($data[$k]);
        }
    }
    return $data;
}

3. Intercept part of the rich text

/**
 * 将富文本中文字截取其中的一部分
 * @param $content
 * @return string
 */
function html_substr_content($content,$length=100)
{
    $content = htmlspecialchars_decode($content);      //把一些预定义的 HTML 实体转换为字符
    $content = str_replace(" ", "", $content);     //将空格替换成空
    $content = strip_tags($content);                 //函数剥去字符串中的 HTML、XML 以及 PHP 的标签,获取纯文本内容
    $con = mb_substr($content, 0, $length, "utf-8");   //返回字符串中的前100字符串长度的字符
    return $con;
}

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