How to solve the problem of uncertain number of parameters in PHP

php solution to the uncertain number of parameters: 1. Return the number of actual parameters through the "func_num_args" function; 2. Return a certain actual parameter through the "func_get_arg" function; 3. Return using the "func_get_args" function An array of actual parameters.

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Solution to the problem of uncertain number of function parameters in php

func_num_args: Returns the number of actual parameters;

func_get_arg: Returns a certain actual parameter, and the index of an actual parameter must be passed in (that is, the index of the parameter at this time in the array returned by func_num_args Index);

func_get_args: Returns an array of actual parameters;

chestnut

function add(){
$args = func_get_args()
print_r($args);
}

1. Disadvantages When we write a function without defining an actual parameter, sometimes the caller does not I am confused about what parameters to pass

2. It is recommended to use...$args

function add(…$args){
print_r($args);
}

Note,

1. When several parameters are passed into add(), the function The internal $args is an array,

The function is called internally...$args will be parsed into function parameters

2. It is a...[ ]The internal $args is a through Go in...The following array

...$args is used to combine parameters to form an array. When calling a function...$args is used to expand the array into function parameters. It's exactly the opposite process.

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