print_r
Function • Return type changed in PHP 8.4
Prints human-readable information about a variable.
print_r Function synopsis
print_r(mixed $value, bool $return = false): string|trueParameters
$value
Typemixed
The expression to be printed.
$return
OptionalTypeboolDefault valuefalse
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 value
Typestring|true
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.
Changes to the print_r Function
PHP 8.4
- Return type changed:
string|booltostring|true
- print_r(mixed $value, bool $return = false): string|bool
+ print_r(mixed $value, bool $return = false): string|truePHP 8.0
- Return type added:
string|bool - Parameter name of parameter #1 changed:
$varto$value - Parameter type added for parameter #1 (
$value):mixed - Parameter type added for parameter #2 (
$return):bool - Parameter default value added for position #2 (
$return):false
- print_r($var, $return)
+ print_r(mixed $value, bool $return = false): string|boolprint_r Function Availability
print_r Function Availability| PHP Version | Availability |
|---|---|
| PHP 8.6Upcoming Release | Yes |
| PHP 8.5Supported (Latest) | Yes |
| PHP 8.4Supported | Yes |
| PHP 8.3Security-Fixes Only | Yes |
| PHP 8.2Security-Fixes Only | Yes |
| PHP 8.1Unsupported | Yes |
| PHP 8.0Unsupported | Yes |
| PHP 7.4Unsupported | Yes |
| PHP 7.3Unsupported | Yes |
| PHP 7.2Unsupported | Yes |
| PHP 7.1Unsupported | Yes |
| PHP 7.0Unsupported | Yes |
| PHP 5.6Unsupported | Yes |
| PHP 5.5Unsupported | Yes |
| PHP 5.4Unsupported | Yes |
| PHP 5.3Unsupported | Yes |