what does php pre mean

php pre is a pre-typesetting mark, which is mainly used to maintain the uniformity of the format when outputting error codes or printing array output.

#The operating environment of this article: Windows7 system, PHP7.1, Dell G3.

php What does pre mean?

Pre is mainly used in PHP code to output error codes, or to print array output to maintain the uniformity of the format.

For example:

Extended information
 Tips for using html tag pre in PHP debugging: 
In debugging In PHP programs, we often print information to view. The print_r function can be very convenient for printing array contents, but when printed, it is not indented according to the format, which seems very inconvenient. 
A little trick is to use the pre tag, such as: 
Example code: 
1,'b'=>2,'c'=>array(1,2,3));
?>
The page is displayed as follows:
Array
[a] => 1
[b] => 2
[c] => Array
(
[0] => 1
[1] => 2
[2] => 3
)
)
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