Variable handling Функции
PHP Manual

print_r

(PHP 4, PHP 5)

print_r Prints human-readable information about a variable

Описание

mixed print_r ( mixed $expression [, bool $return ] )

print_r() displays information about a variable in a way that's readable by humans.

print_r(), var_dump() and var_export() will also show protected and private properties of objects with PHP 5. Static class members will not be shown.

Remember that print_r() will move the array pointer to the end. Use reset() to bring it back to beginning.

Список параметров

expression

The expression to be printed.

return

If you would like to capture the output of print_r(), use the return parameter. If this parameter is set to TRUE, print_r() will return its output, instead of printing it (which it does by default).

Возвращаемые значения

If given a string, integer 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.

Примечания

Замечание: This function uses internal output buffering with this parameter so it can not be used inside an ob_start() callback function.

Список изменений

Версия Описание
4.3.0 The return parameter was added. If you need to capture the output of print_r() with an older version of PHP prior, use the output-control functions.
4.0.4 Prior to PHP 4.0.4, print_r() will continue forever if given an array or object that contains a direct or indirect reference to itself. An example is print_r($GLOBALS) because $GLOBALS is itself a global variable that contains a reference to itself.

Примеры

Пример #1 print_r() example

<pre>
<?php
$a 
= array ('a' => 'apple''b' => 'banana''c' => array ('x''y''z'));
print_r ($a);
?>
</pre>

Результат выполнения данного примера:

<pre>
Array
(
    [a] => apple
    [b] => banana
    [c] => Array
        (
            [0] => x
            [1] => y
            [2] => z
        )
)
</pre>

Пример #2 return parameter example

<?php
$b 
= array ('m' => 'monkey''foo' => 'bar''x' => array ('x''y''z'));
$results print_r($btrue); // $results now contains output from print_r
?>

Смотрите также


Variable handling Функции
PHP Manual