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用App Inventor 2做扫描仪App？从拍照到展示，手把手教你搭一套完整相机功...
...当你准备在自己的App里加入拍照功能时，可能会发现一个问题：照相机组件拍完照片之后去哪了？照片怎么用？怎么让拍完的照片立刻显示在界面上？今天这篇教程，就是围绕这三个问题展开的。
你将学到
• 照相机（Camera...
Passing base64 encoded strings in URL
...ommend just writing your own helpers. Like these from the comments on the php manual page for base64_encode:
function base64_url_encode($input) {
return strtr(base64_encode($input), '+/=', '._-');
}
function base64_url_decode($input) {
return base64_decode(strtr($input, '._-', '+/='));
}
...
How do I log errors and warnings into a file?
...ile, but to set up all of that within the script (not changing anything in php.ini)?
7 Answers
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PHP Session Security
What are some guidelines for maintaining responsible session security with PHP? There's information all over the web and it's about time it all landed in one place!
...
What's the difference between :: (double colon) and -> (arrow) in PHP?
There are two distinct ways to access methods in PHP, but what's the difference?
6 Answers
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How to resolve “must be an instance of string, string given” prior to PHP 7?
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Prior to PHP 7 type hinting can only be used to force the types of objects and arrays. Scalar types are not type-hintable. In this case an object of the class string is expected, but you're giving it a (scalar) string. The error messa...
Getting the first character of a string with $str[0]
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Does PHP $str[0] take into account that there can be 2Byte long chars? UTF and such? (even though substr() does not help with it either!)
– Tomer W
Jun 26 '13 at 13:29
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js/php判断终端类型：PC访问、手机访问、微信访问 - 更多技术 - 清泛网 - ...
js/php判断终端类型：PC访问、手机访问、微信访问一般也可以在前端用js来判断访问终端，代码如下：<script>function GetQueryString(name) { var reg = new RegExp("(^|&)"+ name +"=([^&]*)(&|$)"); v 一般也可以在前端用js来判断访问终端，代码...
Is there a function to make a copy of a PHP array to another?
Is there a function to make a copy of a PHP array to another?
19 Answers
19
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PDO closing connection
...
According to documentation you're correct (http://php.net/manual/en/pdo.connections.php):
The connection remains active for the lifetime of that PDO object. To
close the connection, you need to destroy the object by ensuring that
all remaining references to it are de...