Php blank pages: Reasons for php blank pages and solutions; php blank pages _ PHP tutorials

The reason for the php blank page in the php Tutorial and the solution are as follows. Php blank pages in the php Tutorial: causes and solutions; reasons for blank pages in php and solutions. many programmers have encountered the reason and solution for the blank php page in the blank php Tutorial during php Development. the blank php page

Summary of causes and solutions for blank pages in php.

Many programmers encounter blank pages during php Development. for comprehensive analysis, the following reasons may be caused by blank pages in php programming:

1. logical error
Logical errors are the most difficult to eliminate. on the surface, the code may be legal and formal, but it is not unexpected to run. This is mentioned in many php tutorials.
Why? Maybe it is not comprehensive enough for the author to think about it. after all, the person is a person, the computer is a computer, and it is impossible for the computer to run the script completely according to the person's ideas.
A better debugging method is to use the annotator "/**/" to comment out some code and observe the running conditions to eliminate errors one by one, and finally locate the error code. In this case, if you want to completely eliminate logical errors, you can't do it without patience.

2. the behavior is undefined.
Code:

If the $ action variable is empty, set it to 1, and then judge the value of $ action variable to make different events. Of course, what will PHP do if $ action is neither 1 nor 2? The answer is-nothing will be done, so a blank page will be generated. Knowing the cause makes it easy to solve the problem.

The solution to this problem is very simple. simply add an else after the if module and print some information.

3. Syntax error
If a syntax error occurs, the error message is displayed. how can this problem be left blank? (Script school www.jbxue.com)
Of course, this is only a few examples. in some homepage spaces, if you write PHP with syntax errors, there will be no prompts.

Solution:
Test locally before uploading files to correct the error code.

4. abuse the error blocker @
The error blocker "@" is often used in places where errors may occur. However, if the blocker is used too much or is not used frequently, it may also lead to blank spaces, let's take a look at the following two PHP scripts:
Test1.php:

Test2.php:

Run test1 and check that a blank page is displayed. Correction is also very easy. you can remove the prefix of the include function or correct the error in the test2.php file.

Php blank page

Problem
Print All. when the blank page is incorrect, add the following to the PHP file:
Error, Note, Warning, and other information are displayed.

PHP blank page questions

Because no output
It's hard to answer questions without output.

Reasons for the blank pages in php and solutions are summarized. many programmers encounter blank pages during php development...