Php If Undefined

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Share the top ten PHP development engineer's development principles

I want to dizzy, in the end I want to listen to whom? In the web development world, PHP is one of the most popular languages, and from PHP you can easily find the script you need. Unfortunately, few people use "best practices" to write a PHP program. Here, we introduce PHP 10 best practices, of course, each one is proven by masters derived. 1. Use PHP at the right time - Rasmus Lerdorf No one better than PHP creator Rasmus Lerdorf understands that PHP is used in ...

53 points to improve the efficiency of PHP programming

It would be faster to enclose the string in single quotes instead of double quotes. Because PHP searches for variables in double-quoted strings, single quotes do not. Note that only echo can do this: it's a "function" that takes multiple strings as arguments, Echo is a language structure, not a real function, so the function with double quotes). 1, if you can define the class method as static, as far as the definition of static, it will speed up nearly 4 times. 2, $ row ['id'] speed ...

Fourteen PHP head start to make a big headache summary

Fourteen make PHP beginners a big headache Summary Today for everyone to give PHP beginners a headache big summary, the following 14 questions hope for PHP beginners to help. 1, the page can not be passed variables get, post, session Automatic global variables in the latest php version is turned off, so to get over the variables from the previous page to use $ _GET ['foo'], $ _ POST [ 'foo'], $ _ SESSION ['foo']. Of course it can be ...

How to use PHP errors as a way to get links

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest Cloud host Technology Hall 1, use search engine to find fault site soon before on the website I read about" broken link construction "   Related articles, when I realized that there might be some way to make this wrong idea of stationmaster become a new optimization method, I started new test and possibility detection. Here may use ...

PHP development in the most common 10 mistakes

PHP is a very popular open source server-side scripting language, and most of the sites you see on the World Wide Web are developed using PHP. This experience will introduce you to the 10 most common PHP development problems, hoping to be helpful to friends. Error 1: Leave a dangling pointer after a foreach loop In a foreach loop, if we need to change the elements of an iteration or in order to http://www.aliyun.com/zixun/aggregation/7208.html "> increase efficiency ...

Master Tips 53 ways to improve the efficiency of PHP programming

It is quicker to use single quotes instead of double quotes to contain strings. Because PHP searches for variables in a string enclosed in double quotes, single quotes are not, note: only echo can do this, it is a "function" that can take multiple strings as arguments: ECHO is the language structure, not the real function, so the function is added double quotes. 1, if you can define the method of the class as static, as far as possible to define static, it will increase the speed of nearly 4 times times. 2, $row [' ID '] speed is $ro ...

Member Registration Verification Code (PHP+MYSQL+AJAX)

Member Registration Verification Code (PHP tutorial +mysql tutorial +ajax) <!doctype HTML Public "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.w3.org/tr/ Xhtml1/dtd/xhtml1-transitional.dtd "> <html> <hea ...

How WordPress uses mail to track 404 pages

Intermediary transaction http://www.aliyun.com/zixun/aggregation/6858.html ">seo diagnose Taobao guest cloud host technology Hall as a conscious web Developer/website owner, You may want to track 404 pages of your site or blog. Of course you can analyze your site's access log files, but today we're going to talk about a better way to track them by sending email reports. So that I can get more timely 404 pages ...

Has your website opened gzip?

Intermediary transaction SEO diagnosis Taobao guest Cloud host technology Hall written in front of the article, a lot of new webmaster, to speed up the speed of Web site access only exist in the server and template selection above, in fact, gzip page compression can greatly enhance the speed of Web site access, for the site in foreign stations, this is an essential step to enhance the Web page   Open speed is very obvious, now we have a systematic understanding of this gzip. First, what is gzip gzip concept gzip ...

Site features exposed in URL address

I like to browse the Web when multiple warn't. This mind needs to look at many elements, each of which provides information. An isolated element is unimportant, but the information that is composed of multiple elements can often be judged with value. So from these elements: Never ignore the URL URL is an important information, professional sensitivity so that the analyst will never ignore the characteristics of the URL address. URL reflects the site's clues, directly to the example: $URL address the domain name many people cheated on the internet, a big reason is never concerned about the URL of the domain name. For example: http: ...

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