PHP: print_r() function
Description
The print_r() function is used to print human-readable information about a variable.
Version:
(PHP 4 and above)
Syntax:
print_r(var_name, return_output)
Parameter:
| Name | Description | Required / Optional |
Type |
|---|---|---|---|
| var_name | The variable being printed. | Required | String |
| return_output | To capture the output in a variable, the parameter should set TRUE. The default value is FALSE. | Optional | Boolean |
Return value:
If the variable is an integer or a float or a string the function returns value of the variable. If the variable is an array the function returns keys and elements, a similarly notation is used for the object. Setting TRUE to return_output parameter the function returns a string
Example -1:
<?php
$var1='abc';
$var2=123.33;
print_r($var1);
echo'<br>';
print_r($var2);
echo'<br>';
$abc = array('Subj1'=>'Physics','Subj2'=>'Chemistry','Subj3'=>'Mathematics','Class'=>array(5,6,7,8));
print_r($abc);
?>
Output :
abc 123.33 Array ( [Subj1] => Physics [Subj2] => Chemistry [Subj3] => Mathematics [Class] => Array ( [0] => 5 [1] => 6 [2] => 7 [3] => 8 ) )
View the example in the browser
Practice here online :
Example -2 :
In the following example, the second parameter of the function has used, capture the output of the function in a variable then print the output with echo.
<?php
$var1='abc';
$result = print_r($var1);
echo $result.'<br>';
$var2=123.33;
$result = print_r($var2);
echo $result.'<br>';
$abc = array('Subj1'=>'Physics','Subj2'=>'Chemistry','Subj3'=>'Mathematics','Class'=>array(5,6,7,8));
$result = print_r($abc);
echo $result.'<br>';
?>
Output:
abc
123.33
Array ( [Subj1] => Physics [Subj2] => Chemistry [Subj3] => Mathematics [Class] => Array ( [0] => 5 [1] => 6 [2] => 7 [3] => 8 ) )
View the example in the browser
Practice here online :
See also