php not null

In the php manual, "a NULL byte (& amp; quot;) is not equivalent to the NULL constant of PHP ." I don't quite understand. Where is the difference? In the php manual, "a NULL byte (" \ 0 ") is not equivalent to the NULL constant of PHP ." I don't

Believe that a lot of people who have been using MySQL for a long time, the concept of these two field properties is not very clear, the general will have the following questions:1, my field type is not NULL, why I can insert null value2, the

Original: http://blog.csdn.net/fwkjdaghappy1/article/details/7703974/Believe that a lot of people who have been using MySQL for a long time, the concept of these two field properties is not very clear, the general will have the following questions:1,

PHP Tutorial Configuration Chinese Narration Let's see what you see, php.ini. [PHP] ;;;;;;;;;;;; WARNING;;;;;;;;;;;;; This is the default settings file for new PHP installations.; By default, PHP installs itself with a configuration suitable for;

Differences between null and not null in mysql and efficiency issues Mysql users may encounter the following situations: 1. My field type is not null. Why can I insert null values? 2. Why is not null more efficient than null? 3. When determining

PHP, a nested abbreviated name, is an abbreviation for the English Super Text preprocessing language (Php:hypertext preprocessor). PHP is an HTML embedded language, PHP and Microsoft's ASP quite a bit similar, is a server-side implementation of

Source: www. oschina. netquestion57579_501_www.oschina.netquestion1579_000062. I think about it in the middle of the night. I thought about it before, after, when I decided to delete my blog account yesterday afternoon. Open the computer, open OSC,

Compiling the source package requires./configure then compile a. so fileOne less error packetInstall packageNormal displayThe LS directory has a./configure fileQuerying module LocationsEditing a configuration fileEditing a configuration fileIncrease

PHP features: the command line mode starts with version 4.3.0. PHP provides a new type of cli sapi (Server Application Programming Interface, Server Application Programming Port) support, named CLI, command Line Interface, that is, Command Line

Today do information collection page encountered a strange problem, study for a long time to find the root cause of the problem, it is a bit strange indeed.(the younger brother often uses the C #, Java and other languages, PHP only occasionally in