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isset() and empty() - what to use

... $var; (a variable declared, but without a value in a class) From http://php.net/manual/en/function.empty.php As mentioned in the comments the lack of warning is also important with empty() PHP Manual says empty() is the opposite of (boolean) var, except that no warning is generated when...
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best practice to generate random token for forgot password

... In PHP, use random_bytes(). Reason: your are seeking the way to get a password reminder token, and, if it is a one-time login credentials, then you actually have a data to protect (which is - whole user account) So, the code wi...
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使用App Inventor 2 控制物联网设备/低功耗蓝牙设备(BLE) · App Inventor 2 中文网

...接。 因此,我们开发蓝牙 LE 组件是为了解决物联网连接问题。 三. 技术方法 BluetoothLE 组件是 MIT App Inventor 的新颖补充。 如图 4 所示,在 MIT App Inventor 平台上创建时,BLE 组件可以作为移动应用程序的一部分实现。 然后,该...
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How to drop unique in MySQL?

...l tab.This removes the index of the particular column. It worked for me in PHP MyADMIN share | improve this answer | follow | ...
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How do I implement basic “Long Polling”?

...rror 404 (to show error handling in the coming Javascript example) msgsrv.php <?php if(rand(1,3) == 1){ /* Fake an error */ header("HTTP/1.0 404 Not Found"); die(); } /* Send a string after a random number of seconds (2-10) */ sleep(rand(2,10)); echo("Hi! Have a random number: " . ...
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Get random item from array [duplicate]

...y pick youtube video from playlist on page load and is working great: <?php $videos = Array(0,1,2,3); echo $videos[array_rand($videos)]; ?> – ioTus Jul 3 '14 at 6:07 64 ...
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PHP reindex array? [duplicate]

...lues does the job : $myArray = array_values($myArray); Also some other php function do not preserve the keys, i.e. reset the index. share | improve this answer | follow ...
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php中三个等于号是什么意思?=== - 更多技术 - 清泛网 - 专注C/C++及内核技术

php中三个等于号是什么意思?===1、=:赋值,在逻辑运算时也有效;2、==:等于运算,但是不比较值的类型;3、===:完全等于运算,不仅比较值,而且还比较值的类型,只有两...1、=:赋值,在逻辑运算时也有效; 2、==:等于...
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php类调用自己的函数 - 更多技术 - 清泛网 - 专注C/C++及内核技术

php类调用自己的函数直接func()会报错,函数未定义。成员函数:$this->func();静态函数:self::func();或类名::func();直接func()会报错,函数未定义。 成员函数: $this->func(); 静态函数: self::func(); 或 类名::func();php 调用 自己函数
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phpcms 启用手机门户(自动判断手机浏览器) - 更多技术 - 清泛网 - 专注C/...

phpcms 启用手机门户(自动判断手机浏览器)1、确定一个域名作为你手机wap站点的访问域名,例如:http: m.xxx.com。接下来在域名管理系统中简析这个域名到你的服务器地址。2、修改 ca...1、确定一个域名作为你手机wap站点的访问...