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MySQL check if a table exists without throwing an exception
...is the best way to check if a table exists in MySQL (preferably via PDO in PHP) without throwing an exception. I do not feel like parsing the results of "SHOW TABLES LIKE" et cetera. There must be some sort of boolean query?
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Sending a JSON to server and retrieving a JSON in return, without JQuery
... }
};
xhr.send();
Handling data in JSON format on the server-side using PHP
<?php
// Handling data in JSON format on the server-side using PHP
//
header("Content-Type: application/json");
// build a PHP variable from JSON sent using POST method
$v = json_decode(stripslashes(file_get_contents(...
How to add http:// if it doesn't exist in the URL?
...
function addScheme($url, $scheme = 'http://')
{
return parse_url($url, PHP_URL_SCHEME) === null ?
$scheme . $url : $url;
}
echo addScheme('google.com'); // "http://google.com"
echo addScheme('https://google.com'); // "https://google.com"
See also: parse_url()
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“互联网卖菜”没那么简单 创业者不要盲目跟风 - 资讯 - 清泛网 - 专注C/C+...
...自提的鲜果说，还是送菜上门的七天买菜网，都因为价格问题导致的盈利困境而歇业，价格是上门送菜的最大障碍，要么狂砸补贴，要么把量做大，维持开支，没有别的路。笔者接触过一些做上门送菜的创业者，往往会问第一个...
调用空智能指针对象的函数，Windows及Linux行为解析 - C/C++ - 清泛网 - 专...
...-O0以上优化版本访问空智能指针对象函数会发生崩溃。
问题起因：一个智能指针对象使用IsNull()判断是否为空后，执行函数，仅在Linux开优化（-O0以上）发生崩溃，代码如下：
#include <stdio.h>
#include <memory>
#include <assert.h>
c...
Path of assets in CSS files in Symfony 2
...ombinations on the same twig, and this route was launched from
"/app_dev.php/"
"/app.php/"
and "/"
thus giving 14 x 3 = 42 tests.
Additionally, all this has been tested working in a subdirectory, so there is no way to fool by giving absolute URLs because they would simply not work.
The tests w...
微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术
微博为什么限制140字(附短信70字限制考)问题的提出申请过那么多的微博，数申请网易微博的动机最不纯，因为它的字数限制不是传说中的140字，而是163个字。当年觉得很可爱，于是就注...问题的提出
申请过那么多的微博，数申...
Invalid argument supplied for foreach()
... This is the only thing that worked for me. For some reason, PHP didn't believe that the multidimensional array I built was actually an array of arrays.
– Justin
Jul 29 '15 at 20:21
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再说WCF Data Contract KnownTypeAttribute - 更多技术 - 清泛网 - 专注IT技能提升
...列化器去寻找未知对象的映射的途径。在Remoting中这样的问题不会存在，因为Remoting实际上是通过将一个类型传递给双方来进行类型匹配的。
那么KnowTypeAttribute到底用在什么地方呢？上边说了，当前类的未知类型。那什么又是当...