


PHP function naming rules: Underscore: used to separate words to improve readability; suitable for private methods or variables. Hyphens: should not be used in function names. Best practices: Avoid hyphens; use underscores to separate words; precede private or protected method or variable names with an underscore.
Usage rules for underscores and hyphens in PHP function naming
In PHP, function naming follows the following usage rules:
Underscore:
- is used to separate words to improve readability.
- Applies to private methods or variables.
Example:
function my_private_function() { // ... }
Hyphens:
- should not be Used for function naming.
Best Practices:
In order to maintain code consistency and readability, it is recommended to follow the following rules:
- Avoid using hyphens.
- Use underscores to separate words.
- For private or protected methods or variables, use an underscore before the name.
Practical case:
Example 1:
Filefunctions.php
function get_user_info($id) { // ... }
Usage:
$user_info = get_user_info(1);
Example 2:
Fileclass.php
class MyClass { private function _private_method() { // ... } }
Usage:
$obj = new MyClass; // 无法访问 _private_method() 因为它是一个私有方法。
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php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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