Print_r and Var_dump output array _php techniques in PHP

The Print_r () and Var_dump () functions can print out the entire array contents and structure.

Print_r ()

Using the Print_r () function, you can print out the entire array contents and structure, displaying the keys and elements in a certain format. Note the Print_r () function is not only for printing, it is actually used to print easily understandable information about variables.

Grammar:

BOOL Print_r (mixed expression) Example:

<?php
$arr _age = Array (a);
Print_r ($arr _age);
? >

Run the example output:

Array ([0] => [1] => [2] => 25) To view the output of the page source code, you can see more readable format:

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

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

Example:

<?php
$arr _age = Array (a);
Var_dump ($arr _age);
? >

Run the example output:

Array (3) {
 [0]=>
 int (a)
 [1]=>
 int ()
 [2]=>
 int
}

The Print_r () and Var_dump () functions are typically used by the debugger, and more often by using echo to output specific array cell values.

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