How to output php array

There are two ways to output PHP arrays: print_r() function and var_dump() function.

1. print_r()

Use the print_r() function to print out the entire array content and structure, and display the keys and elements according to a certain format. Note that the print_r() function is not just for printing, it is actually used to print easy-to-understand information about the variables.

Syntax:

bool print_r( mixed expression )

Example:

Result:

Array ( [0] => 18 [1] => 20 [2] => 25 )

Tips:

View the web page source code of the output result, you can see a more readable format:

Array
(
    [0] => 18
    [1] => 20
    [2] => 25
)

2, var_dump()

Like the print_r() function, the var_dump() function can also be used to print the data and structure of the array. However, the var_dump() function is more powerful than print_r(). It can print multiple variables at the same time and give the type information of the variables.

Example:

Result:

array(3) {
  [0]=>
  int(18)
  [1]=>
  int(20)
  [2]=>
  int(25)
}

print_r() and var_dump() functions Generally used for debugging programs, more often echo is used to output specific array unit values.

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