Detailed explanation of usage examples of variable parameters of PHP user-defined functions

php supports variable number of parameter lists in user custom functions.

In php5.5 and earlier versions, use the func_num_args(), func_get_arg(), func_get_args() function implementation.

Output:

1
a
Array
(
  [0] => a
)

3
1
Array
(
  [0] => 1
  [1] => 2
  [2] => 3
)

2
Array
(
  [0] => d
  [1] => e
)

Array
(
  [0] => Array
    (
      [0] => d
      [1] => e
    )

  [1] => Array
    (
      [0] => f
    )

)

In php5.6 and above, you can use... syntax.

Example 1: Use...$args to replace any number of parameters

The output results are the same as php5.5 using func_num_args(), func_get_arg(), func_get_args( ) function is consistent.

Example 2: ArrayConvert to parameter list

Example 3: Some parameters are specified, and the number of other parameters is variable

Output:

name:fdipzone
tag:programmer
args:
Array
(
)

name:terry
tag:designer
args:
Array
(
  [0] => 1
  [1] => 2
)

name:aoao
tag:tester
args:
Array
(
  [0] => Array
    (
      [0] => a
      [1] => b
    )

  [1] => Array
    (
      [0] => c
    )

  [2] => Array
    (
      [0] => d
    )

)

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