Introduce PHP file naming, class and method naming, variable naming and other specifications

The specifications for naming PHP files, naming classes and methods, and naming variables are particularly important when naming.

1. File naming

The naming of class files must start with a capital letter, and the naming of other files (configuration files, views, general script files, etc.) is all lowercase.

Some_library.php application_config.php

2. Naming of classes and methods

Class names must start with a capital letter, use underscores to separate multiple words, and do not use camel case naming.

class Super_class

Class methods should be in all lowercase and should clearly indicate the function of the method, preferably including a verb. Avoid lengthy names and use underscores to separate multiple words.

function get_file_properties()

3. Naming of variables

The naming rules of variables are very close to the naming rules of class methods. Use all lowercase letters, use underscores to separate them, and the purpose of the variable should be clearly stated. Very short meaningless variables should only be used as iterators in for loops.

for ($j = 0; $j < 10; $j++)
$last_city

Constants follow variable naming, but the letters are all capital letters

MY_CONSTANT
NEWLINE

Note that when assigning variables, there must be a space before and after

4.TRUE, FALSE and NULL are the key Use all capital letters.

5. Don’t use the || operator, it’s not visible on some devices (it may look like the number 11). Using the && operator is slightly better than using AND, but both are acceptable. In addition, a space should be added before and after the ! operator.

Note: Some PHP functions return FALSE on failure, but they may also return valid values ​​such as "" or 0, which are equal to FALSE in loose type comparisons. So when you use these return values ​​for comparison in conditions, be sure to use strict type comparison to ensure that the return value is indeed what you want, and not some other value of a loose type.

Also follow this strict approach when checking your own return values ​​and variables, using === and !== when necessary.

6. Use Tab instead of spaces for indentation

7. Use single quotes to enclose the string, use double quotes when there are variables in the string, and use curly brackets to wrap the variables . In addition, when there are single quotes in the string, double quotes should also be used so that escape characters are not needed.

‘My String’
“My string {$foo}”
“SELECT foo FROM bar WHERE baz = ‘bag’”

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