PHP prints out array contents and structure functions print_r and var_dump

PHP prints out the array content and structure function print_r and var_dump

print_r() function

Example:

<?php 
 $arr_test =array(1, 2, 3);
 print_r($arr_test);
?>

Run this example output:

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

var_dump() function

Example:

<?php
$arr_test = array(1, 2,3);
var_dump($arr_test);
?>

Run this example and the output is:

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

The var_dump() function is used the same as the print_r() function. 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.

                 

The above introduces the PHP print output array content and the structural functions print_r and var_dump, including the content. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!