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print_r

Description

The print_r of Variable Handling for PHP prints human-readable information about a variable.

Syntax

print_r(
    mixed $value,
    bool $return = false
): string|true

Parameters

value

The expression to be printed.

return

If you would like to capture the output of print_r(), use the return parameter. When this parameter is set to true, print_r() will return the information rather than print it.

Return

If given a string, int or float, the value itself will be printed. If given an array, values will be presented in a format that shows keys and elements. Similar notation is used for objects.

When the return parameter is true, this function will return a string. Otherwise, the return value is true.

Examples

1 · value · bool

<?

$value = false;

print_r($value);

2 · value · int
<?

$value = 0;

print_r($value);

0
3 · value · float
<?

$value = 0.0;

print_r($value);

0
4 · value · string
<?

$value = "0";

print_r($value);

0
5 · value · array
<?

$value = [0];

print_r($value);

Array
(
    [0] => 0
)

6 · value · object · standard class
<?

$value = new stdclass;
$value->var = 0;

print_r($value);

stdClass Object
(
    [var] => 0
)

7 · value · object · custom class
<?

class myclass
{
    public $var;
}

$value = new myclass;
$value->var = 0;

print_r($value);

myclass Object
(
    [var] => 0
)

8 · return · false
<?

$value = 0;
$return = false;

$output = print_r($value, $return);

echo PHP_EOL . "output: ";
var_dump($output);

0
output: bool(true)

9 · return · true
<?

$value = 0;
$return = true;

$output = print_r($value, $return);

echo PHP_EOL . "output: ";
var_dump($output);

output: string(1) "0"