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Methods to get function information in PHP: get_defined_functions(): Returns the names of all defined functions, classified by internal, user and merged lists. get_function_arg(): Returns the argument list of a specific function. get_function_args(): Returns arguments as strings. Reflection API: Get more details about a function such as name, file name, documentation comments through reflection objects.
How to get information about functions in PHP
PHP provides a variety of functions that allow you to get information about runtime functions. information. This article explores these functions so you can effectively understand and manipulate your code.
get_defined_functions()
This function returns an array containing the names of all defined functions. It is divided into three parts:
Example:
$functions = get_defined_functions(); print_r($functions['internal']);
get_function_arg()
This function returns the argument list of a specific function.
Example:
$args = get_function_arg('array_sum'); print_r($args);
get_function_args()
This function is similar to get_function_arg()
, But the parameters will be returned as strings.
Example:
$args = get_function_args('array_sum'); echo $args;
reflection
The Reflection API allows you to access more about a function by creating a function reflection object details.
Example:
$reflection = new ReflectionFunction('array_sum'); echo $reflection->getName(); echo $reflection->getFileName(); echo $reflection->getDocComment();
Actual case:
// 获取所有已定义函数的名称 $functions = get_defined_functions(); echo "All defined functions:"; print_r($functions['all']); // 获取特定函数的参数 $args = get_function_arg('array_sum'); echo "Parameters of array_sum:"; print_r($args); // 获取反射对象以获取函数元数据 $reflection = new ReflectionFunction('array_sum'); echo "Function name:" . $reflection->getName(); echo "File name:" . $reflection->getFileName();
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